RESUMO
Background: The tibial and common peroneal nerves are dorsal and ventral divisions of the ventral rami of L4 to S3 of the lumbosacral plexus that join to form the sciatic nerve. The two nerves are structurally separate and supply the posterior compartment of the thigh, the leg and the foot. The point of bifurcation or separation of the sciatic nerve into tibial and common peroneal nerve varies. The common site is at the junction of the middle and lower third of the back of the thigh, near the apex of the popliteal fossa, but division may occur at any point above this. It may also rarely occur below it. The variations in the bifurcation of the sciatic nerve have clinical implications. They may result in nerve injury during deep intramuscular injections in the gluteal region, sciatica, piriformis syndrome etc. This study is to report the variations of the bifurcation in the sciatic nerve found in the cadaveres from Ethiopia, and discuss the clinical implications of such variations. Conclusion: We conclude from this study that the bifurcation of the sciatic nerve could occur high up in the gluteal region in relation to the piriformis muscle and may present clinical challenges in patient management.
RESUMO
The distal sensory branches of the common peroneal nerve are the medial dorsal cutaneous and intermediate dorsal cutaneous from the superficial peroneal nerve and deep peroneal sensory from the deep peroneal nerve. Sensory conduction studies of all those branches were studied antidromically in 50 neurologically healthy adult subjects, 26.52+8.28 years of age. The superficial peroneal nerve was stimulated on the anterolateral aspect of the leg, 12 cm proximal to the recording electrode placed at the ankle directly over each of its branches. The deep peroneal nerve was stimulated at the ankle, 12 cm proximal to the medial dorsal cutaneous nerve latency and amplitude of the intermediate dorsal cutaneous nerve were 2.3+0.3,2.98+0.34 msec and 7.8+4.29 ตV, respectively. The same parameters for the deep peroneal sensory were 3.13+0.3,3.91+0.35 msec and 7.41+4.06 ตV, respectively.
RESUMO
Measurement of motor nerve conduction velocity(MNCV) of the median and peroneal nerves was performed in 79 normal fullterm newborn infants and children up through the age of 329 weeks. They were divided into eight groups by age. The following study was undertaken to obtain the mean +/- S.D. and the regression equation of Y (MNCV) on X (age). The MNCV values of each group were compared with those of normal adults.