Sciatica Notes
Sciatica Notes
Sciatica Notes
Site:
On the posterior wall
of the pelvis,
In front of Piriformis
muscle.
Course & Distribution
It leaves the pelvis
through greater sciatic
foramen, below the
piriformis & passes in the
gluteal region (between
ischial tuberosity &
greater trochanter) then
to posterior compartment
of thigh.
Termination:
In the middle of the back of the
thigh It divides into 2
branches:
Tibial &
Common Peroneal (Fibular).
Branches of Sciatic Nerve
1. Cutaneous:
To all leg & foot
EXCEPT:
Areas supplied by
the saphenous
nerve (branch of
femoral nerve).
2. Muscular:
• To Hamstrings:
(flexors of knee & extensors of
the hip).
(through tibial part) to:
1. Hamstring part of Adductor
Magnus.
2. Long head of Biceps
Femoris.
3. Semitendinosus.
4. Semimembranosus.
NB. The short head of biceps
receives its branch from the
lateral popliteal (common
peroneal) nerve.
Tibial Nerve
Course:
Descends through
popliteal fossa to
posterior compartment
of leg, accompanied
with posterior tibial
vessels.
Passes deep to flexor
retinaculum (through
the tarsal tunnel, behind
medial malleolus) to
reach the sole of foot
where it divides into 2
terminal branches
(Medial & Lateral
planter nerves.
Muscular Branches
1. Muscles of posterior
compartment of leg:
Planter flexors of
ankle,
Flexors of toes
ONE Invertor of foot
(tibialis posterior).
2. Intrinsic muscles of
sole
Common Peroneal (Fibular) Nerve
Course:
Leaves popliteal fossa & turns
around the lateral aspect of
neck of fibula, (Dangerous
Position).
Then divides into:
Superficial peroneal or
(Musculocutaneous) :
to supply the Lateral
compartment of the leg.
Deep peroneal or
(Anterior Tibial):
to supply the Anterior
compartment of the leg.
Muscular Branches