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Sciatic Nerve
What it is, what it was, and where it is.
10
Anatomy
Professional
09/13/2009

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Term
What is the sciatic nerve formed by?
Definition
Anterior and posterior divisions of the ventral ramie of L4-S3.
Term
Where does it exit the pelvis from?
Definition
The greater sciatic foramen passing below the piriformis muscle.
Term
Where does it lie?
Definition
On the superior gemellus, obturator internus, inferior gemellus, and quadratus muscle.
Term
The Sciatic nerve runs in the middle of ____________ compartment of the ___________, supplying all of its muscles.
Definition
middle of the posterior compartment of the thigh
Term
The sciatic nerve is accompanied by the _____________ artery in the ______________ fossa, wehre it terminates by dividing.
Definition
popliteal artery, popliteal fossa
Term
The sciatic nerve divides into what two branches?
Definition
Tibial (L4-S3), and common peroneal nerves (L4-S2)
Term
The two terminal nerves from the sciatic supply all of the muscles and the skin below the _______________, except _______________.
Definition
knee joint, except for a strip of skin along the medial aspect of the leg and foot that are innervated by the saphenous branch of the femoral nerve.
Term
Surface markings of sciatic nerve question 1-
The surface marking of the sciatic nerve starts at a point midway between the __________ and the ____________.
Definition
PSIS, ischial tuberosity.
Term
Surface markings of sciatic nerve question 2-
This point is connected by a curved line with the midpoint between ______________ and the ____________.
Definition
ischial tuberosity and the greater trochanter
Term
Surface markings of sciatic nerve question 3-
It then continues vertically downwards in the midline of the _________ aspect of the thigh.
Definition
posterior
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