Sciatic Nerve
SCIATIC NERVE
ORIGIN
Union of roots in front of piriformis
muscle
The lumbosacral
trunk
from the L4 and L5 roots
descends between the sacral promontory and ala
and the S1 to S3 roots emerge from the ventral sacral foramina
COURSE
EXIT OF PELVIS
passes beneath piriformis through greater sciatic foramen
THIGH
travels down the posterior
thigh
to popliteal fossa
travels in posterior compartment of
thigh
superficial to adductor magnus
muscle
deep
to long head of biceps femoris
muscle
Just above popliteal fossa
divides in to two terminal branches
The
tibial nerve
,
travels down the posterior compartment of the
leg
into the
foot
The common fibular
nerve
(also called the
common peroneal nerve
),
travels down the anterior and lateral compartments of the
leg
into the
foot
POPLITEAL FOSSA