Segmental Innervation of the Lower Limb

MUSCLE	L1	L2	L3	L4	L5	S1	S2	S3	S4	NERVE
Quadratus Lumborum	X	X	X	-	-	-	-	-	-	Lumbar Plexus
Psoas minor	X	X	-	-	-	-	-	-	-	Lumber Plexus
Psoas major	X	X	X	-	-	-	-	-	-	Lumbar Plexus
Ilacus	-	X	X	-	-	-	-	-	-	Lumber Plexus
Pectineus	-	X	X	X	-	-	-	-	-	Femoral
Sartorius	-	X	X	X	-	-	-	-	-	Femoral
Quadriceps femoris	-	X	X	X	-	-	-	-	-	Femoral
Gracilis	-	X	X	-	-	-	-	-	-	Obturator
Adductor Longus	-	X	X	X	-	-	-	-	-	Obturator
Adductor Brevis	-	X	X	X	-	-	-	-	-	Obturator
Adductor Magnus	-	X	X	X	-	-	-	-	-	Obturator
Add. Magnus (Posterior)	-	-	-	X	X	X	-	-	-	Sciatic - (Tibial)
Obturator Externus	-	-	X	X	-	-	-	-	-	Obturator
Gluteus Medius	-	-	-	X	X	X	-	-	-	Superior Gluteal
Gluteus Minimus	-	-	-	X	X	X	-	-	-	Superior Gluteal
Tensor Fascia Lata	-	-	-	X	X	X	-	-	-	Superior Gluteal
Gluteus Maximus	-	-	-	-	X	X	X	-	-	Inferior Gluteal
Piriformis	-	-	-	-	X	X	X	-	-	Sacral Plexus
Superior Gemellus	-	-	-	-	X	X	X	-	-	Obturator Internus N.
Obturator Internus	-	-	-	-	X	X	X	-	-	Obturator Internus N.
Inferior Gemellus	-	-	-	X	X	X	-	-	-	Quadratus femoris
Quadratus femoris	-	-	-	X	X	X	-	-	-	Nerve
Semimembranosus	-	-	-	-	X	X	X	-	-	Sciatic (T)
Semitendinosus	-	-	-	-	X	X	X	-	-	Sciatic (T)
Biceps femoris (L)	-	-	-	-	X	X	X	-	-	Sciatic (T)-
Biceps femoris (S)	-	-	-	-	X	X	X	-	-	Sciatic (CP)
Tibialis anterior	-	-	-	X	X	-	-	-	-	Deep Peroneal
Extensor hallicus longus	-	-	-	-	X	X	-	-	-	Deep Peroneal
Extensor digitorum longus	-	-	-	-	X	X	-	-	-	Deep Peroneal
Peroneus tertius	-	-	-	-	X	X	-	-	-	Deep Peroneal
Extensor digitorum brevis	-	-	-	-	X	X	-	-	-	Deep Peroneal
Peroneus longus	-	-	-	-	X	X	X	-	-	Superficial Peroneal
Peroneus brevis	-	-	-	-	X	X	X	-	-	Superficial Peroneal
Plantaris	-	-	-	-	X	X	-	-	-	Tibial
Popliteus	-	-	-	-	X	X	-	-	-	Tibial
Gastrocnemius	-	-	-	-	-	X	X	-	-	Tibial
Soleus	-	-	-	-	-	X	X	-	-	Tibial-
Tibialis Posterior	-	-	-	X	X	-	-	-	-	Tibial
Flexor Digitorum Longus	-	-	-	-	-	X	X	-	-	Tibial
Flexor Hallicus Longus	-	-	-	-	-	X	X	-	-	Tibial
Abductor Hallicus	-	-	-	-	X	X	-	-	-	Medial Plantar
Flexor Digitorum Brevis	-	-	-	-	X	X	-	-	-	Medial Plantar
Flexor Hallicus Brevis	-	-	-	-	X	X	-	-	-	Medial Plantar
Lumbricals 1	-	-	-	-	X	X	-	-	-	Medial Plantar
Quadratus Plantae	-	-	-	-	-	-	X	X	-	Lateral Plantar
Abductor Digiti Minimi	-	-	-	-	-	-	X	X	-	Lateral Plantar
Flexor Digiti Minimi	-	-	-	-	-	-	X	X	-	Lateral Plantar
Lumbricals 2, 3, 4	-	-	-	-	-	-	X	X	-	Lateral Plantar
Oppon. Digiti Minimi	-	-	-	-	-	-	X	X	-	Lateral Plantar
Adductor Hallicus	-	-	-	-	-	-	X	X	-	Lateral Plantar
Plantar Interossei	-	-	-	-	-	-	X	X	-	Lateral Plantar
Dorsal Interossei	-	-	-	-	-	-	X	X	-	Lateral Plantar

X = Spinal nerve segments contributing to the innervation of a muscle.
X (bolded) = Main spinal nerve root innervating a muscle. The muscle used to test the integrity of the
particular spinal nerve.