PNS - Lumbar & Sacral Plexuses

Question 1

Iliohypogastric Nerve

Answer 1

Muscles of anterolateral abdominal wall (internal obliques; Skin on lower abdomen and hip

Question 2

Genitofemoral Nerve

Answer 2

Skin of scrotum and labia majora

Question 3

Lateral Femoral Cutaneous Nerve

Answer 3

Skin on lateral thigh

Question 4

Femoral Nerve

Answer 4

Muscles that extend the leg (quadriceps group); Skin on anteromedial thigh, medial leg and foot

Question 5

Obturator Nerve

Answer 5

Abductors of hip (adductors magnus, brevis, and longis); Gracilis muscle; Skin over medial surface of thigh

Question 6

Saphenous Nerve

Answer 6

Skin over medial surface of leg

Question 7

Sciatic Nerve

Answer 7

Two of the Hamstrings (semimembranosus and semitendinous); adductor magnus (w/obturator nerve)

Question 8

Posterior Femoral Cutaneous Nerve

Answer 8

Skin of perineum and posterior surface of thigh and leg

Question 9

Tibial Nerve

Answer 9

Flexors of knee and extensors (plantar flexors) of ankle (popliteus, gastrocnemius, soleus, and tibialis posterior muscles and long head of biceps femoris muscle); Flexors of toes; Skin over posterior surface of leg; Plantar surface of foot

Question 10

Common Fibular (Peroneal) Nerve

Answer 10

Short head of biceps femoris muscle; fibularis (brevis and longs) and tibialis anterior muscles; extensors of toes; skin over anterior surface of leg and dorsal surface of foot; skin over lateral portion of foot (through the sural nerve)

Question 11

Pudendal Nerve

Answer 11

Muscles of perineum, including urogenital diaphragm and external and urethral sphincter muscles; skin of external genitalia and related skeletal muscles (bulbospongiosus and ischiocavernosus muscles)