Sciatic Nerve

Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

sciatic nerve

[sī′ad·ik ′nərv]
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.


References in periodicals archive ?
However, Dirk strongly advises that you check your physiotherapist has experience with the spine and the sciatic nerve before undergoing treatment.
The sciatic nerves are the longest nerves in the body; they begin in the lower back and extend through the buttocks down each leg to the feet.
23%), did not promote a significant alteration in electrophysiological parameters of sciatic nerve CAP.
Two to six arteries are needed to form the extraneural arterial chain of the sciatic nerve, which pass to it from neighboring arteries, perforating, popliteal artery, inferior gluteal, and medial circumflex femoral at the certain level (Ugrenovic et al.
However, in a preliminary study, a 10 mm nerve gap was not completely regenerated through the SIS graft in vivo, and the sciatic nerve only grew into the proximal portion of the graft at 90th days (15).
After complete sensory and motor onset in the sciatic nerve distribution, patients were positioned supine.
He subsequently lost left ankle flexion and extension, suggesting sciatic nerve palsy.
In the end of the 22nd PS, the animals were weighed and again anesthetized with ketamine and xylazine, and 2 cm fragments were dissected from the right sciatic nerve distal.
MDA and NO levels, as well as SOD, GPx, and CAT activities were measured in sciatic nerve tissue homogenates using commercial enzyme-linked immunosorbent assay (ELISA) kits (Cayman Inc, Ann Arbor, MI, USA) on a microplate reader (BMG Labtech Spectrostar Nano, GmbH, Ortenberg, Germany).
The option of using a local anaesthetic and steroid to treat sciatica involves numbing the sciatic nerve for a period of hours, giving short-term relief while the steroid has a long-term effect reducing inflammation in the joint and around the nerve.
MRI pelvis showed an abnormal orientation of left sciatic nerve through cleaved fibers of the piriformis muscle.