Lower Limb: Nerve Supply (Lumbosacral Plexus) Flashcards
Muscular branches of lumbosacral plexus
T12, L1-L4
quadratus lumborum (T12-L4)
psoas minor (L1)
psoas major (L2-L4)
iliacus (L2-L3)
Iliohypogastric nerve
L1
- Lateral cutaneous branch
* skin of anterior part of the side of the butt - Anterior cutaneous branch
* skin of abdomen above pubis
Ilioinguinal nerve
L1
- internal oblique
- skin of thigh
- skin of penis and scrotum (males)
- skin of mons pubis and adjoining labium majus (female)
Genitofemoral nerve
L1-L2
- Genital branch
- cremaster and skin of scrotum (males)
- skin of mons pubis and labium majus (females)
- Femoral branch
* skin over femoral triangle
Lateral (femoral) cutaneous nerve
L2-L3
- Anterior branch
* skin of anterior/lateral thigh - Posterior branch
* skin of lateral thigh
Obturator nerve
L2-L4
- Anterior branch
- skin of medial thigh
- adductor longus
- adductor brevis
- gracilis
- pectineus
- Posterior branch
- obturator externus
- adductor magnus
- adductor brevis
Femoral nerve
L2-L4
- Nerve to the pectineus
- Anterior division
- intermediate cutaneous nerve of thigh
- medial cutaneous nerve of thigh
- Posterior division
- saphenous nerve (skin over medial side of leg)
- muscular branches (supply quadriceps femoris)
Nerve to the quadratus femoris and gemellus inferior
L4-S1
Nerve to the obturator internus and gemellus superior
L5-S2
Nerve to the piriformis
S1-S2
Superior gluteal nerve
L4, L5, S1
- Superior branch
* supplies gluteus medius/minimus - Inferior branch
* supplies gluteus medius/minimus
Interior gluteal nerve
L5, S1, S2
- supplies gluteus maximus
Posterior femoral cutaneous nerve
S1, S2, S3
- Gluteal branches
* skin over gluteus maximus - Perineal branch
- skin of thigh
- skin of scrotum/labium majus
- Branches to the back of the thigh and leg
Sciatic nerve
REMEMBER: actually two separate nerves contained within one sheath
1) Tibial (L4-S3)
2) Common peroneal (L4-S2)
Tibial nerve
L4-S3
- Articular branches
* knee joint - Muscular branches
- Sural nerve
- lower 1/3 leg
- heel, medial side of foot
- Medial plantar nerve
- sole of foot
- first 3.5 toes
- Lateral plantar nerve
- sole
- lateral 1.5 toes
Common peroneal nerve
L4-S2
Prior to branching:
- articular branches (knee joint)
- cutaneous branches (calf)
- muscular branch (biceps femoris)
- Deep peroneal (anterior tibial nerve)
- Superficial peroneal (musculocutaneous) nerve
Pudendal nerve
S2-S4
- Inferior rectal nerve
- sphincter ani externus
- lining of lower part of anal canal
- skin around anus
- Perineal nerve
- posterior scrotal (labial) branches
- muscular branches
- Dorsal nerve of the penis/clitoris
Visceral branches of lumbosacral plexus (pelvic splanchnic nerves)
S2-S4
preganglionic parasympathetics supplying the bladder, penis, clitoris, testes, ovaries, uterine tubes, uterus, transverse/descending/sigmoid colon
Muscular branches of lumbosacral plexus
S4
- levator ani, coccygeus, sphincter ani externus
Coccygeal plexus
S4, S5, coccygeal nerves
- supply skin in region of the coccyx
