ADULT ALBINO RATS

STUDY OF MOTOR UNITS INNERVATED BY TIBIAL NERVE

Abstract

The average number and size of motor units were assessed by investigating the components of motor units supplied by Tibial Nerve in adult albino rats. The motor neurons forming the Tibial Nerve localized by HRP technique extended from the caudal part of L3 to S1 segments of the spinal cord. The motoneurons forming the Tibial Nerve (TN) which are distributed mainly in the Posterolateral and Post-Posterolateral groups with few of them are also distributed in the central groups. The average somal diameter of motoneurons ranged between 12 and 63 m. The motor end-plates on skeletal myofibers of muscles supplied by Tibial Nerve were localized by using bromo-indigo and urea-silver technique. The total of 826 motor units with the size of 137 of the muscles innervated by Tibial Nerve have been observed in the present study.