Sciatic Nerve


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sciatic nerve

[sī′ad·ik ′nərv]
(neuroscience)
Either of a pair of long nerves that originate in the lower spinal cord and send fibers to the upper thigh muscles and the joints, skin, and muscles of the leg.

Sciatic Nerve

 

the largest nerve trunk in vertebrate animals and man. It is formed from projections of spinal-cord motor neurons and sensory cells of the spinal ganglia; in man, it is formed from the fourth and fifth pairs of the lumbar nerves and the first to third pairs of the sacral nerves. It emerges through the foramen infrapiriforme as a long branch of the sacral plexus.

The sciatic nerve consists of two nerves, the tibial nerve (pre-axial component) and the common peroneal nerve (postaxial component), enclosed in a common connective-tissue membrane. Branches emerging from the sciatic nerve in the femur extend from the musculus gluteus maximus to the popliteal fossa, reaching the posterior muscles and the knee joint; the tibial and common peroneal nerves are separated here as well. The tibial nerve innervates the posterior muscles of the leg and the muscles of the sole; it gives off the medial cutaneous nerve in the leg and innervates the skin of the sole. The common peroneal nerve bifurcates into the deep and superficial peroneal nerves which terminate in the anterior and lateral muscles of the leg, the muscles of the back of the foot, and the skin of the lateral surface of the leg and of the back of the foot.

V. V. KUPRIIANOV

References in periodicals archive ?
At weeks 4,8 and 12, Rats in the axotomy groups showed time-dependent decreases in SFI values due of sciatic nerve degeneration and gastrocnemius muscle atrophy that were significantly different compared to control group (P<0.001) (Fig.
Any pain that begins in the lower back and spreads down may be caused by your sciatic nerve.
This could explain why the impact of diabetes, probably in the expression of the myo-inositol transporters as well, was more pronounced in the sciatic nerve when compared to the DRG.
The age, weight and height distribution of patients involved in the study have been presented in figures.(1-3) The sciatic nerve at located at a depth of 9.6 [+ or -] 3 cm (Figure 1) and the femoral nerve was found at a depth of 5.1 [+ or -] 4 cm (Figure 2)
The pain sciatic nerve injury causes prevents an individual from using the affected leg, and eventually the muscles concerned weaken and atrophy.
A detailed examination revealed an avulsion of the entire course of the sciatic nerve along with its terminal branches, namely tibial nerve and common peroneal nerve.
The fascial sheaths (epineurium) of the sciatic nerve are continuous with the dura mater.
It causes one of the vertebrae to slip forward over the vertebra beneath it, and this presses on the sciatic nerve roots in the process.
A NUMBER of things can cause sciatica pain, but, says Dr Sarah Brewer, GP and medical director at Healthspan (healthspan.co.uk): "One of the usual causes of sciatica is a 'slipped' intervertebral disc, which presses on the root of the sciatic nerve where it joins the spinal cord."
The aim of this study is to analyze the oncological and functional outcomes of limb-sparing surgery in STS with sciatic nerve involvement.
To illustrate the range of axotomized motoneurons in the spinal cord that were involved in the sciatic nerve injury, 4 rats were used to perform FG retrograde labeling.