Lumbosacral root syndrome

Root injury	Dermatome pain	Muscle supplied	Movement weakness	Reflex involved
L1	Groin	Iliopsoas	Hip flexion	Cremaster
L2	Anterior aspect thigh	Iliopsoas, sartorius, hip adductors	Hip flexion, adduction	Cremaster
L3	Medial aspect of knee	Iliopsoas, sartorius, quadriceps, hip adductors	Hip flexion, knee extension, hip adduction	Patellar
L4	Medial aspect of calf	Tibialis anterior, quadriceps	Foot inversion, knee extension	Patellar
L5	Lateral part of lower leg, dorsal of foot	Extensor hallucis longus, extensor digitorum longus	Toe extension, ankle dorsiflexion	None
S1	Lateral edge of foot	Gastrocnemius, soleus	Ankle plantar flexion	Ankle jerk
S2	Posterior thigh	Flexor digitorum longus, flexor hallucis longus	Ankle plantar flexion, toe flexion	None