Nerves of Lumbosacral Plexus 2

Nerve to quadratus femoris muscle

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Origin: Anterior divisions of sacral plexus (L4-S1)

Course: Exits pelvis via greater sciatic foramen inferior to piriformis muscle

Branch:

Motor: Quadratus femoris and inferior gemellus muscles

Cutaneous:

Nerve to Levator Ani

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Origin: Anterior divisions of sacral plexus (S3-S4)

Course: From its source, travels on superior surface of levator ani

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Motor: Iliococcygeus and pubococcygeus muscles

Cutaneous:

Nerve to coccygeus muscle

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Origin: Anterior divisions of sacral plexus (S3-S4)

Course: From its source, travels on superior surface of coccygeus muscle

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Motor: Coccygeus (ischiococcygeus) muscle

Cutaneous:

Pudendal Nerve

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Origin: Anterior divisions of sacral plexus (S2-S4)

Course: Exits pelvis via greater sciatic foramen inferior to piriformis muscle; enters perineum via lesser sciatic foramen, coursing through ischioanal fossa and pudendal (Alcock’s) canal

Branch: Inferior anal and perineal nerves, dorsal nerve of clitoris/penis

Motor: Perineal muscles, external anal sphincter, pubococcygeus muscle

Cutaneous: Posterior scrotum/vulva, clitoris/penis

Posterior Femoral Cutaneous Nerve

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Origin: Anterior and posterior divisions of sacral plexus (S1-S3)

Course: Exists pelvis via greater sciatic foramen inferior to piriformis muscle; runs inferiorly to gluteus maximus muscle and continues distally to popliteal fossa

Branch: Inferior gluteal cutaneous nerves, perineal branches

Motor:

Cutaneous: Inferior gluteal region, posterior thigh, popliteal region

Sciatic Nerve

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Origin: Anterior and posterior divisions of sacral plexus (L4-S3)

Course: Exists pelvis via greater sciatic foramen inferior to piriformis muscle, passing superficial to lateral rotators of hip and deep to gluteus medius muscle to access thigh between greater trochanter of femur and ischial tuberosity

Branch: Muscular branches, tibial and common fibular nerves

Motor: Posterior compartment of thigh

Cutaneous:

Tibial Nerve

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Origin: Sciatic Nerve

Course: Courses through popliteal fossa and sural region deep to soleus muscle, traversing tarsal tunnel posterior to medial malleolus

Branch: Muscular and medial calcaneal branches, crural interosseous nerve, medial sural cutaneous nerve, medial and lateral plantar nerves

Motor: Posterior compartment of leg

Cutaneous: Heel

Common Fibular Nerve

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Origin: Sciatic Nerve

Course: Courses medial to biceps femoris muscle and lateral to lateral head of gastrocnemius muscle and neck of fibula

Branch: Superficial and deep fibular nerves, lateral sural cutaneous nerve, sural communicating branch

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