RESUMO

Disturbance in the organogenesis of tongue might lead to some malformations like tongue tie, bifid tongue and hairy tongue. Severe degrees of these anomalies may cause speech impairment or periodontal defects. The present study was done on patients of the southern coastal belt of India during the past two years, on gross tongue anomalies. The results of the present study reveal that occurrence of tongue tie is 0.2 percent and bifid tongue is 0.3 percent in the southern coastal population. Since great majority of these oral anomalies have genetic basis the purpose of the present report is to highlight that these anomalies can exist without any familial background and also to suggest that environmental factor may play a role in the etiogenesis of these anomalies.

La alteración en la organogénesis de la lengua puede dar lugar a algunas malformaciones como anquiloglosia, lengua bífida y lengua vellosa. Grados severos de estas anomalías puede provocar un trastorno del habla o defectos periodontales. El presente estudio se realizó, durante los últimos dos años, en pacientes de la franja costera del Sur de la India con anomalías graves en la lengua. Los resultados del estudio revelaron que, en la población costera del sur, la incidencia de anquiloglosia era de 0,2 porciento y de lengua bífida de 0,3 por ciento. Dado que la gran mayoría de estas anomalías orales tienen base genética, el propósito del presente informe fue poner de relieve que estas anomalías pueden existir sin ningún tipo de antecedentes familiares y también sugerir que los factores ambientales podrían jugar un papel en el etiogenesis de estas anomalías.

Assuntos

RESUMO

INTRODUCTION: Methotrexate, a folate antagonist, is a mainstay treatment for childhood acute lymphoblastic leukemia. It is also widely used in a low dose formulation to treat patients with rheumatoid arthritis. In rats, methotrexate is known to induce micronuclei formation, leading to genetic damage, while vitamin A is known to protect against such methotrexate-induced genetic damage. Leucovorin (folinic acid) is generally administered with methotrexate to decrease methotrexate-induced toxicity. OBJECTIVES: We aimed to determine whether vitamin A and leucovorin differed in their capacity to prevent formation of methotrexate-induced micronuclei in rat bone marrow erythrocytes. The present study also aimed to evaluate the effect of combined treatment with vitamin A and leucovorin on the formation of methotrexate-induced micronuclei. METHODS: Male and female Wistar rats (n=8) were injected with 20 mg/kg methotrexate (single i.p. dose). The control group received an equal volume of distilled water. The third and fourth groups of rats received vitamin A (5000 IU daily dose for 4 successive days) and leucovorin (0.5 mg/kg i.p. dose for 4 successive days), respectively. The fifth and sixth groups of rats received a combination of vitamin A and a single dose of methotrexate and a combination of leucovorin and methotrexate, respectively. The last group of rats received a combination of leucovorin, vitamin A and single dose of methotrexate. Samples were collected at 24 hours after the last dose of the treatment into 5% bovine albumin. Smears were obtained and stained with May-Grunwald and Giemsa. One thousand polychromatic erythrocytes were counted per animal for the presence of micronuclei and the percentage of polychromatic erythrocyte was determined. RESULTS: Comparison of methotrexate-treated rats with the control group showed a significant increase in the percentage of cells with micronuclei and a significant decrease polychromatic erythrocyte percentage. Combined methotrexate and vitamin A therapy and combined methotrexate and leucovorin therapy led to significant decreases in the micronuclei percentage and an increase in polychromatic erythrocyte percentage when compared to rats treated with methotrexate alone. Leucovorin was found to be more effective than vitamin A against the formation of methotrexate-induced micronuclei. CONCLUSIONS: Both vitamin A and leucovorin provided significant protection against genetic damage induced by methotrexate.

Assuntos

RESUMO

Arterial variations of distal parts of lower extremities are well-documented and can be demonstrated with the help of Doppler ultrasound or by arteriography. However, absence or variation of posterior tibial artery is considered a rare finding. We present a case of hypoplastic posterior tibial artery that terminated by supplying soleus muscle. The variant arterial supply to the sole was provided by the enlarged peroneal artery that continued as the lateral plantar artery. The awareness of these variations is important to vascular surgeons while performing arterial reconstructions in femorodistal bypass graft procedures, and also to orthopedists during surgical clubfoot release.

Variações arteriais de partes distais dos membros inferiores estão bem documentadas e podem ser demonstradas com o auxílio de ultra-sonografia Doppler ou por arteriografia. Entretanto, a ausência ou variação da artéria tibial posterior é um raro achado. Apresentamos um caso de artéria tibial posterior hipoplásica que terminava suprindo o músculo solear. Esse suprimento arterial variante foi fornecido pela artéria peroneal aumentada que continuava como artéria plantar lateral. Estar consciente dessas variações é importante para cirurgiões vasculares ao realizarem reconstruções arteriais em procedimentos de derivação femorodistal, bem como para ortopedistas durante correção cirúrgica do pé torto.

Assuntos

RESUMO

OBJECTIVE: The omohyoid muscle is a long, thin muscle consisting of superior and inferior bellies and an intermediate tendon, which runs obliquely in the lateral cervical region. The omohyoid is important in neck dissections because it is the surgical landmark for level III and IV lymph node metastases. METHODS: In the present study, the anterior and posterior triangle of the neck was dissected in 35 male cadavers and observed for variations in the omohyoid bilaterally. Observations were focused on variations in number, attachments, and position of omohyoid. RESULTS: Among the 35 cadavers studied, double omohyoid was present in one cadaver, inferior belly originated from the clavicle in three cadavers, superior belly merged with the sternohyoid in two cadavers, and the omohyoid received additional slips from the sternum in one cadaver. Standard attachment and position of the omohyoid was observed in the remaining cadavers. CONCLUSION: Variations of this muscle are important because of its close relation to the large vessels and brachial plexus. Because of the direct adhesion of the intermediate tendon to the anterior wall of the internal jugular vein and its connection with it through a thin lamina of the pretracheal layer of the cervical fascia, the contraction of the omohyoid muscle has a direct effect on the lumen of this vessel.

Assuntos

RESUMO

Many of the anatomical variations that are inadequately described or quantified are actually more clinically and surgically significant than being just anatomical curiosities. We report about such a variation where an aberrant slip existed in the scalene group, in a 56 year old embalmed female cadaver. This kind of variation may affect the size of the scalene triangle, and thus, may potentially result in varied signs and symptoms in patients vulnerable to thoracic outlet syndrome (TOS). Proximity of the scalene muscles to the brachial plexus, subclavian artery and vein, coexisting with aberrant slips or bundles may also predispose to compression syndromes.

Muchas de las variaciones anatómicas no están suficientemente descritas o cuantificadas y son actualmente clínica y quirúrgicamente significativas más que curiosidades anatómicas. Reportamos una variación anatómica en el grupo de los músculos escalenos, presente en un cadáver de una mujer de 56 años. Este tipo de variación puede afectar el tamaño del triángulo escalénico y por lo tanto, puede potencialmente resultar en variados signos y síntomas en pacientes vulnerables al síndrome de salida torácica. La proximidad de los músculos escalenos con el plexo braquial, arteria y vena suclavias, coexistiendo con fascículos aberrantes pueden predisponer a síndromes de compresión.

Assuntos

RESUMO

During routine dissection in the Department of Anatomy, multiple variations of forearm muscles in relation to the radial nerve and its branches were observed on the right side of a 34 year old male cadaver. Brachioradialis close to its origin was receiving muscle fibers from the brachialis and the radial nerve was passing in between them. Extensor carpi radialis brevis was absent and the extensor carpi radialis longus was giving two tendons in the second compartment of extensor retinaculum before its insertion while passing deep to the abductor pollicis longus. Absence of extensor carpi radialis brevis can be explained with the arrangement in lower mammals, where the two extensores carpi radiales are represented by one muscle. Ontogeny repeats phylogeny and anatomical variations have developmental basis. Henee, the pattern of muscular arrangement in this case can be said to be less evolved than the usual arrangement. The course of radial nerve between the two heads of brachioradialis makes it highly vulnerable to compression and injury, which may manifest as wrist drop (radial nerve palsy) or radial tunnel syndrome (compression of posterior interosseous nerve).

Durante una disección de rutina en el Departamento de Anatomía, se observaron múltiples variaciones de los músculos del antebrazo, en relación con el nervio radial y sus ramos, en el lado derecho de un cadáver de 34 años de edad, de sexo masculino. Cerca de su origen el músculo braquioradial recibía fibras del músculo braquial y el nervio radial cruzaba entre ellos. El músculo extensor radial corto del carpo se encontraba ausente y el músculo extensor radial largo del carpo se continuaba con dos tendones en el segundo compartimiento del retináculo extensor, bajo el músculo abductor largo de pulgar, antes de su inserción. La ausencia del músculo extensor radial corto del carpo se puede explicar en mamíferos inferiores, donde los dos músculos extensores radiales están representados por un sólo músculo. La ontogenia repite la filogenia y las variaciones anatómicas inciden en su desarrollo. Por lo tanto, de acuerdo al patrón muscular se puede afirmar que en este caso existe menos evolución que lo habitual. El curso del nervio radial entre las dos cabezas del músculo braquioradial, lo hace muy vulnerable a la compresión y las lesiones, que pueden manifestarse son, caída de la muñeca (parálisis del nervio radial) o el síndrome del túnel radial (compresión del nervio interóseo posterior).

Assuntos

RESUMO

OBJECTIVE: The tendons of the extensor carpi radialis longus and brevis muscles are quite useful in tendon transfer, such as in correction of finger clawing and restoration of thumb opposition. Knowledge of additional radial wrist extensor muscle bellies with independent tendons is useful in the above-mentioned surgical procedures. METHODS: The skin, subcutaneous tissue, and antebrachial fascia of 48 (24 on the right side and 24 on left side) male upper limb forearms were dissected. The following aspects were then analyzed: (a) the presence of additional muscle bellies of radial wrist extensors, (b) the origin and insertion of the additional muscle, and (c) measurements of the muscle bellies and their tendons. RESULTS: Five out of 48 upper limbs (10.41%) had additional radial wrist extensors; this occurred in 3 out of 24 left upper limbs (12.5%) and 2 out of 24 right upper limbs (8.3%). In one of the right upper limbs, two additional muscles were found. The length and width of each additional muscle belly and its tendon ranged between 2 - 15 cm by 0.35 - 6.4 cm and 2.8 - 20.8 cm by 0.2 0.5 cm, respectively. The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone. CONCLUSION: The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

Assuntos

RESUMO

Presence of additional muscles in the pectoral region has often been reported. We report about the presence of Pectoralis Minimus muscle, in a male cadaver. It was present deep to the pectoralis major muscle and superomedial to the pectoralis minor muscle. The variant was closely related to the branches of thoracoacromial vessels where one of the branches was passing between the pectoralis minor muscle and the variant muscle. Hyperabduction of the arm may compress these vessels giving rise to certain vascular symptoms. Also these variations should be borne in mind during certain surgical procedures in the pectoral region

Presencia de músculos supernumerarios en la región pectoral han sido reportados. En un cadáver de un hombre se describe la presencia de un músculo Pectoralis Minimus. El músculo se localizaba profundo al músculo pectoral mayor y superomedial al músculo pectoral menor. La variación se relacionaba con las ramas de los vasos toracoacromiales donde una de las ramas pasaba entre el músculo pectoral menor y la variación muscular. La hiperabducción del brazo puede comprimir estos vasos provocando síntomas vasculares. Estas variaciones se deben tener en cuenta durante los procedimientos quirúrgicos en la región pectoral

Assuntos

RESUMO

OBJECTIVE: The tendons of the extensor carpi radialis longus and brevis muscles are quite useful in tendon transfer, such as in correction of finger clawing and restoration of thumb opposition. Knowledge of additional radial wrist extensor muscle bellies with independent tendons is useful in the above-mentioned surgical procedures. METHODS: The skin, subcutaneous tissue, and antebrachial fascia of 48 (24 on the right side and 24 on left side) male upper limb forearms were dissected. The following aspects were then analyzed: (a) the presence of additional muscle bellies of radial wrist extensors, (b) the origin and insertion of the additional muscle, and (c) measurements of the muscle bellies and their tendons. RESULTS: Five out of 48 upper limbs (10.41 percent) had additional radial wrist extensors; this occurred in 3 out of 24 left upper limbs (12.5 percent) and 2 out of 24 right upper limbs (8.3 percent). In one of the right upper limbs, two additional muscles were found. The length and width of each additional muscle belly and its tendon ranged between 2 - 15cm by 0.35 - 6.4cm and 2.8 - 20.8cm by 0.2 0.5cm, respectively. The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone. CONCLUSION: The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

Assuntos

RESUMO

OBJECTIVE: The omohyoid muscle is a long, thin muscle consisting of superior and inferior bellies and an intermediate tendon, which runs obliquely in the lateral cervical region. The omohyoid is important in neck dissections because it is the surgical landmark for level III and IV lymph node metastases. METHODS: In the present study, the anterior and posterior triangle of the neck was dissected in 35 male cadavers and observed for variations in the omohyoid bilaterally. Observations were focused on variations in number, attachments, and position of omohyoid. RESULTS: Among the 35 cadavers studied, double omohyoid was present in one cadaver, inferior belly originated from the clavicle in three cadavers, superior belly merged with the sternohyoid in two cadavers, and the omohyoid received additional slips from the sternum in one cadaver. Standard attachment and position of the omohyoid was observed in the remaining cadavers. CONCLUSION: Variations of this muscle are important because of its close relation to the large vessels and brachial plexus. Because of the direct adhesion of the intermediate tendon to the anterior wall of the internal jugular vein and its connection with it through a thin lamina of the pretracheal layer of the cervical fascia, the contraction of the omohyoid muscle has a direct effect on the lumen of this vessel.

Assuntos

RESUMO

INTRODUCTION: Methotrexate, a folate antagonist, is a mainstay treatment for childhood acute lymphoblastic leukemia. It is also widely used in a low dose formulation to treat patients with rheumatoid arthritis. In rats, methotrexate is known to induce micronuclei formation, leading to genetic damage, while vitamin A is known to protect against such methotrexate-induced genetic damage. Leucovorin (folinic acid) is generally administered with methotrexate to decrease methotrexate-induced toxicity. OBJECTIVES: We aimed to determine whether vitamin A and leucovorin differed in their capacity to prevent formation of methotrexate-induced micronuclei in rat bone marrow erythrocytes. The present study also aimed to evaluate the effect of combined treatment with vitamin A and leucovorin on the formation of methotrexate-induced micronuclei. METHODS: Male and female Wistar rats (n=8) were injected with 20 mg/kg methotrexate (single i.p. dose). The control group received an equal volume of distilled water. The third and fourth groups of rats received vitamin A (5000 IU daily dose for 4 successive days) and leucovorin (0.5 mg/kg i.p. dose for 4 successive days), respectively. The fifth and sixth groups of rats received a combination of vitamin A and a single dose of methotrexate and a combination of leucovorin and methotrexate, respectively. The last group of rats received a combination of leucovorin, vitamin A and single dose of methotrexate. Samples were collected at 24 hours after the last dose of the treatment into 5 percent bovine albumin. Smears were obtained and stained with May-Grunwald and Giemsa. One thousand polychromatic erythrocytes were counted per animal for the presence of micronuclei and the percentage of polychromatic erythrocyte was determined. RESULTS: Comparison of methotrexate-treated rats with the control group showed a significant increase in the percentage of cells with micronuclei and a significant decrease polychromatic...

Assuntos

RESUMO

To evaluate the mandibular angle and to analyze the relationship of the angle and height & breadth of the ramus of the mandible to the gender, so as to study its role in the anthropological diagnosis. The angle, height and breadth of the ramus of adult dry human mandibles of both sexes were measured using a goniometer. The values obtained were analyzed statistically. The present study showed a statistically significant difference in the mandibular angle as well as height of the ramus between both the sexes. The mean mandibular angle of Indian population when compared to that of European population was found to be lower by 9 degrees. The findings of this study might be useful in providing anthropological data that can also be used in dental and medical practice. However, the Indian mandible can be used for sexual dimorphism as is usual in anthropological work; it appears to possess important unfavourable anatomic factors that may predispose the individuals to difficult laryngoscopy or intubation.

Para estudiar su rol en el diagnóstico antropológico, evaluamos el ángulo de la mandíbula y analizamos las relaciones de este ángulo con la altura y ancho de la rama de la mandíbula, en ambos sexos. Con un goniómetro, en huesos secos, fue obtenido el ángulo, alto y ancho de las mandíbulas humanas. Los valores obtenidos fueron analizados estadísticamente. El estudio mostró diferencias estadísticamente significativas en el ángulo mandibular como también en la altura de la rama de la mandíbula, en ambos sexos. La media del ángulo mandibular de la población hindú fue 9 grados menor, comparada con la población europea. Los resultados de este estudio pueden ser útiles al aportar datos antropológicos utilizados en las prácticas médica y dental. Por otra parte, la mandíbula de los hindúes puede ser usada como dimorfismo sexual como es usual en trabajos antropológicos. Parece haber factores anatómicos desfavorabes importantes que pueden predisponer a los individuos a laringoscopías difíciles o intubación.

Assuntos

RESUMO

Tibial collateral ligament by virtue of its length, composite attachments, and biomechanical exertions is more prone to lesions. A systematic analysis of the dimensions and variations of this ligament has been presented in this article. With the decrease emphasis on anatomy as a preclinical subject and recent successful moves to curtail total teaching hours for dissection, coupled with the increasing shortage of cadavers, data of this nature will in our opinion becomes scarce progressively. With these factors in context, and attempt is made to record the gross morphological features of the ligament from a series of dissections.

El ligamento colateral tibial, por virtud de su longitud, inserciones y esfuerzos biomecánicos, está más propenso a lesiones. Un análisis sistemático de las dimensiones y variaciones de este ligamento se presentan en este artículo. El decrecimiento del énfasis de la Anatomía como un ramo preclínico y la falta de cadáveres nos movieron a disminuir las horas de disección. Así, en nuestra opinión, los datos anatómicos son progresivamente más escasos. Con el propósito de registrar las características morfológicas macroscópicas del ligamento colateral tibial, realizamos una serie de disecciones.

Assuntos

RESUMO

RESUMEN: Una inusual presentación de duplicación del conducto torácico con una rara comunicación linfático-venosa, fue encontrada durante una disección de rutina, por estudiantes de pregrado. El conducto torácico se encuentra duplicado a nivel de la vértebra T12. Normalmente el conducto torácico se abre en la unión de la venas yugular interna izquierda y subclavia izquierda. En el lado derecho del cuello, el conducto linfático derecho recibe la linfa de la parte derecha de la cabeza y del cuello, del miembro superior derecho y lado derecho del tórax. El conducto torácico duplicado en el lado izquierdo se abrió directamente en la vena cava inferior. Este caso es discutido con respecto a su desarrollo, incidencia y significación clínica.

Assuntos