LE innervations Flashcards
lumbosacral plexus
L4 - S3 (+S4)
sciatic n. (L4, L5, S1, S2, S3) → common peroneal and tibial n.
four branches, each 3 from 3 spinal n. roots
- superior gluteal (L4, L5, S1) → gluteus medius and minimus, TFL
- inferior gluteal (L5, S1, S2) → gluteus maximus
- posterior cutaneous n. thigh (S1, S2, S3)
- pudendal n. (S2, S3, S4)
L2, L3, L4 → femoral n. → [muscles]
L2, L3, L4 → femoral n. → quads, iliopsoas
[roots] → [nerve] → quads, iliopsoas
L2, L3, L4 → femoral n. → quads, iliopsoas
L2, L3, L4 → obturator n. → [muscles]
L2, L3, L4 → obturator n. → adductor, gracilis
[roots] → [nerve] → adductor, gracilis
L2, L3, L4 → obturator n. → adductor, gracilis
L4, L5 → sciatic n. → deep fibular → [muscles]
L4, L5 → sciatic n. → deep fibular → tibialis anterior (TA), extensor digitorum longus (EDL)
[roots] → [nerve] → [nerve] → tibialis anterior (TA), extensor digitorum longus (EDL)
L4, L5 → sciatic n. → deep fibular → tibialis anterior (TA), extensor digitorum longus (EDL)
L4, L5, S1 → sciatic n. (tibial division) → [muscles]
L4, L5, S1 → sciatic n. (tibial division) → semimembranosus, semitendinosus, long head of biceps femoris
[roots] → [nerve] → semimembranosus, semitendinosus, long head of biceps femoris
L4, L5, S1 → sciatic n. (tibial division) → semimembranosus, semitendinosus, long head of biceps femoris
L5, S1 → sciatic n. (fibular division) → [muscle]
L5, S1 → sciatic n. (fibular division) → short head of biceps femoris
[roots] → [nerve] → short head of biceps femoris
L5, S1 → sciatic n. (fibular division) → short head of biceps femoris
L4, L5, S1 → superior gluteal n. → [muscle]
L4, L5, S1 → superior gluteal n. → gluteus medius, gluteus minimus, TFL
[roots] → [nerve] → gluteus medius, gluteus minimus, TFL
L4, L5, S1 → superior gluteal n. → gluteus medius, gluteus minimus, TFL
L5, S1 → sciatic n. → superficial fibular n. → [muscle]
L5, S1 → sciatic n. → superficial fibular n. → fibularis longus, fibularis brevis
[roots] → [nerve] → [nerve] → fibularis longus, fibularis brevis
L5, S1 → sciatic n. → superficial fibular n. → fibularis longus, fibularis brevis
L5, S1 → sciatic n. → tibial n. → [muscle]
L5, S1 → sciatic n. → tibial n. → tibialis posterior (TP), flexor digitorum longus (FDL)
[roots] → [nerve] → [nerve] → tibialis posterior (TP), flexor digitorum longus (FDL)
L5, S1 → sciatic n. → tibial n. → tibialis posterior (TP), flexor digitorum longus (FDL)
L5, S1, S2 → inferior gluteal n. → [muscle]
L5, S1, S2 → inferior gluteal n. → gluteus maximus
[roots] → [nerve] → [nerve] → gluteus maximus
L5, S1, S2 → inferior gluteal n. → gluteus maximus
S1, S2 → sciatic n. → tibial n. → [muscle]
S1, S2 → sciatic n. → tibial n. → gastrocnemius, soleus
[roots] → [nerve] → [nerve] → gastrocnemius, soleus
S1, S2 → sciatic n. → tibial n. → gastrocnemius, soleus
S1, S2 → sciatic n. → tibial n. → medial plantar n. → [muscle]
S1, S2 → sciatic n. → tibial n. → medial plantar n. → flexor hallucis brevis (FHB), abductor hallucis brevis (AHB)
[roots] → [nerve] → [nerve] → [nerve] → flexor hallucis brevis (FHB), abductor hallucis brevis (AHB)
S1, S2 → sciatic n. → tibial n. → medial plantar n. → flexor hallucis brevis (FHB), abductor hallucis brevis (AHB)
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → [muscle]
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → abductor digiti quinti pedis (ADQP)
[roots] → [nerve] → [nerve] → [nerve] → abductor digiti quinti pedis (ADQP)
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → [muscle]
L2, L3 → lateral femoral cutaneous n. → [cutaneous]
L2, L3 → lateral femoral cutaneous n. → lateral thigh
[roots] → [nerve] → lateral thigh
L2, L3 → lateral femoral cutaneous n. → lateral thigh
L2, L3, L4 → femoral n. → saphenous n. → [cutaneous]
L2, L3, L4 → femoral n. → saphenous n. → medial shin, medial calf
L2, L3, L4 → femoral n. → saphenous n. → medial shin, medial calf
[roots] → [nerve] →[nerve] → medial shin, medial calf
L2, L3, L4 → femoral n. → saphenous n. → medial shin, medial calf
L4, L5 → sciatic n. → tibial n. → medial plantar n. → [cutaneous]
L4, L5 → sciatic n. → tibial n. → medial plantar n. → medial plantar surface of foot
[roots] → [nerve] → [nerve] → [nerve] → medial plantar surface of foot
L4, L5 → sciatic n. → tibial n. → medial plantar n. → medial plantar surface of foot
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → [cutaneous]
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → lateral plantar surface of foot
[roots] → [nerve] → [nerve] → [nerve] → lateral plantar surface of foot
S1, S2 → sciatic n. → tibial n. → lateral plantar n. → lateral plantar surface of foot
innervation of dorsum of foot
superficial fibular n. except 1st web space (deep fibular n.)
tarsal tunnel
“Tom Dick And Very Nervous Harry”
medial malleolus, flexor retinaculum
anterior → posterior: TP, FDL, tibial a./v./n., FHL
tibial nerve splits → medial and lateral plantar n., inferior calcaneal n.
tibial n. → medial plantar n. → [muscles]
tibial n. → medial plantar n. → AH, FDB, FHB, 1st lumbrical; medial plantar sensation
tibial n. → lateral plantar n. → [muscle]
tibial n. → lateral plantar n. → ADQP, interossei, all other lumbricals (2,3,4); lateral plantar sensation
[roots] → [division] → femoral n. → ?
L2, L3, L4 → posterior division lumbar plexus → femoral n. → quadriceps + skin over quads/anterior thigh → saphenous n. → cutaneous inn. medial leg
thigh cutaneous innervation
medial: obturator
anterior: femoral (continues as saphenous n. → medial leg)
lateral: lateral femoral cutaneous n.; nothing to do with femoral n., totally separate branch of lumbosacral plexus
lumbosacral plexus
L1-S4 ventral rami
dorsal rami → paraspinals
lumbar plexus: L1-L4
anterior division → obturator n.
posterior division → femoral n. (L2,3,4) and LFCN (L2,3) → saphenous SNAP, LFCN SNAP, femoral n. CMAP
sacral plexus: L4-S4
→ sciatic n.
anterior division → tibial n. → sural SNAP, plantar SNAP, AH CMAP
posterior division → common fibular n. → superficial fibular SNAP, EDB CMAP
superior and inferior gluteal n. come directly off sacral plexus
