Human Anatomy and Physiology

What is the sciatic nerve?

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2014-10-13 13:38:03

(Sciatica is a condition involving pain, weakness, numbness, or

tingling in the leg. It is caused by an injury to or compression of

the sciatic nerve which branches down your back.The sciatic nerve

is commonly injured by fractures of the pelvis, gunshot wounds, or

other trauma to the buttocks or thigh. Prolonged sitting or lying

with pressure on the buttocks may also injure it. )

The sciatic nerve is the longest nerve in your body; it runs

from your lower back, through your buttock, down your leg.

The tibial and fibular nerves originate from spinal segments

L4-S3. The two nerves come together and are referred to jointly as

the sciatic (meaning hip) nerve. The sciatic nerve is

the largest peripheral nerve in the body.They separate at the back

of the knee. The tibial nerve supplies the posterior compartment of

the leg and the fibular supplies the anterior and lateral


The sciatic nerve are nerve roots coming out of the spinal cord and

into the lower back.

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