Adult albino rats; study of motor units innervated by tibial nerve

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 S 1 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

Pressure necrosis of articular cartilage; types of connective tissue fibers involved in its repair

OBJECTIVE: The hypothesis that was evolved in the present study was to investigate the repair of damaged articular cartilage by connective tissue fibers other than collagen fibers. Setting: Anatomy Department. Period: Seven Weeks. At the end of sixth week of immobilization reticular fibers were seen invading the collagenous scar in the floor of ulcer. The obtained result indicates that it is not only the collagen fibers, which fill the gap, but reticular fibers are also involved in the repair of articular cartilage by fibrosis