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AAAC45 21/5/05 10:53 AM Page 100
45 The nerves of the lower limb II

L IV

L V
Lumbosacral trunk
Superior gluteal nerve
S I
(L 4, 5, S 1)
Inferior gluteal nerve Fig.45.2
S II
(L 5, S 1, 2) The sciatic nerve and its major branches
Nerve to quadratus
femoris (L 4, 5, S 1) S III Sciatic nerve (L 4–S 3)
To obturator Nerve to quadratus femoris (L 4, 5, S 1)
internus (L 5, S 1, 2)
S IV
Sciatic Nerve to obturator internus (L 5, S 1, 2)
Posterior cutaneous S V Muscular branches to hamstrings
nerve of thigh (S 1, 2, 3)
Coccygeal (semitendinosus, semimembranosus
Perforating cutaneous and biceps femoris) and hamstring
nerve (S 2, 3) part of adductor magnus
Pudendal
(S 2, 3, 4) Tibial nerve (L 4, 5, S 1, 2, 3)
Fig.45.1 Muscular branches to:
The sacral plexus plantaris Common peroneal nerve (L 4–S 2)
popliteus
gastrocnemius Lateral cutaneous nerve of the calf
soleus Knee joint
Knee joint

Sural communicating nerve
Superficial peroneal nerve
Sural nerve (supplies:
(skin of lower lateral calf, peroneus longus, brevis, and skin)
lateral foot and little toe)
Deep peroneal nerve
(supplies:
Muscular branches to: extensor digitorum longus
flexor digitorum longus tibialis anterior
flexor hallucis longus extensor hallucis longus
tibialis posterior
peroneus tertius
extensor digitorum brevis
and skin of the 1st dorsal web space)
Deep branch
Superficial
branch
Medial plantar Deep peroneal
Lateral plantar Medial plantar Superficial
(L 4, 5) peroneal

Lateral plantar
(S 1, 2)
Fig.45.3
The medial and lateral plantar nerves

100 Lower limb