Exam 5 Nerves Flashcards
Gluteus maximus
Inferior gluteal n.
Gluteus medius
Superior gluteal n.
Gluteus minimus
Superior gluteal n.
Piriformis
S1, S2 (nerve of piriformis)
Obturator Internus
L5, S1, S2 (nerve of obterator internus)
Superior Gemellus
L5, S1, S2 (nerve of obterator internus
Inferior Gemellus
L5, S1 (nerve of quadratus femoris)
Quadratus Femoris
L5, S1 (nerve of quadratus femoris)
Sacral Plexus
Formed by Ventral Primary rami of Lumbosacral trunk (L4,L5), S1-S4
Exits pelvis through greater sciatic foramen under piriformis m.
Supply muscles & skin of gluteal region, posterior thigh, leg & foot
Splits into anterior (flexor muscles) & posterior (extensor muscles) divisions
Nerves of Anterior division of L4-S4
Tibial n. (Sciatic n. w/ common peroneal), N. to obturator internus, N. to quadratus femoris, pudendal n., N. to levator ani, & part of posterior femoral cutaneous
Nerves of Posterior division of L4-S4
Common peroneal n. (Sciatic n. w/ tibial), Superior gluteal, Inferior gluteal, part of posterior femoral cutaneous, N. to piriformis
Superior gluteal n.
L4-S1
Gluteus medius, gluteus minimus, tensor fasciae latae
Exits pelvis through greater sciatic foramen ABOVE piriformis muscle
Inferior gluteal n.
L5-S2
Gluteus maximus
Sciatic n.
L4-S3 - largest branch
2 nerves: Tibial (anterior division) & Common Peroneal (posterior division)
Posterior femoral cutaneous
S1-S3 - from sacral plexus
Skin of back of thigh & popliteal
Branches: Inferior clunial nn. - skin of upper posterior thigh (inferior gluteal region)
Perineal branches
Nerve to quadratus femoris
L5-S1
Quadratus femoris & inferior gemellus
Nerve to obturator internus
L5-S2
Obturator internus & superior gemellus
Nerve to piriformis
S1-S2
Piriformis
Pudendal nerve
S2-S4
Branches to inferior rectal n. & perineal n.
Skin of upper gluteal region
Superior cluneal (L1-S3 posterior rami) Medial cluneal (S1-S3 posterior rami)
Genital branches of genitofemoral & Ilioingunial
Genitofemoral: L1,2
Ilioinguinal L1
From superficial ring to supply skin of proximal medial thigh
Femoral branch of genitofemoral
L1,L2
Skin over femoral triangle (proximal part of anterior thigh)
Medial & Intermediate Cutaneous branches of femoral
L2-L4
Branches of femoral n. supply skin to medial & distal anterior thigh
Lateral femoral cutaneous
L2,L3
Enter thigh medial to ASIS
Supply skin of lateral thigh
Femoral N.
L2-L4
Anterior compartment of thigh (Sartorius, Quadriceps femoris, Iliopsoas, Articularis genu) & Pectineus
& Sensory to Anterior medial & intermediate cutaneous branch & Saphenous n.
Sartorius m.
Femoral N.
Rectus femoris
Femoral N.
Vastus lateralis
Femoral N.
Vastus medialis
Femoral n.
Vastus intermedius
Femoral n.
Articularis genu
Femoral n.
Iliopsoas
Femoral n.
Tensor fascia latae
Superior gluteal n.
Saphenous n.
Branch of Femoral n.
Travels through adductor canal & leaves canal at lower end to innervate skin of medial leg & foot to 1st metatarsal
Obturator n.
L2-L4
Medial compartment of thigh (Obturator externus, Pectineus, Adductor longus, Adductor brevis, Adductor magnus, Gracilis)
Anterior & posterior division on either side of adductor brevis m. (Anterior division between adductor longus & brevis, posterior division between adductor brevis & magnus)
Pectineus m.
Femoral & Obturator n.
Adductor longus
Obturator n. anterior branch
Adductor brevis
Obturator n. anterior branch
Adductor magnus
Obturator n. posterior branch (adductor part to linea aspera) & Tibial n. (hamstring part to adductor tubercle)
Gracilis
Obturator n. anterior branch
Obturator externus
Obturator n.
Tibial n.
L4-S3 - Posterior thigh & leg muscles
From Sciatic n. - Posterior thigh compartment (Biceps femoris long head, Semitendinosus, Semimembranosus) & Adductor magnus (medial hamstring part)
From Tibial n. (after division) - Posterior leg ( Triceps surae, Plantaris, Popliteus, Tibialis posterior, Flexor digitorum longus, Flexor hallucis longus)
Branches: Medial sural cutaneous n., Lateral dorsal cutaneous n., Medial & lateral calcaneal branches, Medial plantar n. and Lateral plantar n.
Biceps femoris
Long head - Tibial n.
Short head - Common peroneal n.
Semitendinosus
Tibial n.
Semimembranosus
Tibial n.
Common peroneal n.
L4-S2
From Sciatic n. - Biceps femoris short head
Branches into Lateral sural cutaneous n., Superficial peroneal n. & Deep peroneal n. (Supply to anterior & lateral leg compartment muscles)
Medial sural cutaneous n.
Branch of tibial n.
Skin at posterior leg
Becomes Sural n. after joining with communicating sural
Lateral sural cutaneous n.
Branch of common peroneal n.
Skin of lateral leg
Sural communicating n.
Branch of lateral sural cutaneous
Joins with medial sural cutaneous
Sural n.
Formed by junction of medial sural & communicating sural cutaneous n.
Skin of posterior leg & continues into foot as lateral dorsal cutaneous n.
Superficial peroneal n.
Branch of common peroneal - courses through lateral compartment
Skin of anterolateral leg & dorsum of foot - Medial & Intermediate dorsal cutaneous n.
Muscles of lateral leg compartment (Peroneus longus & Peroneus brevis)
Deep peroneal n.
Branch of common peroneal
Anterior leg compartment (Tibialis anterior, Extensor hallucis longus, Extensor digitorum longus, Peroneus tertius) & enters foot - supply Extensor hallucis brevis & Extensor digitorum brevis
Sensory: skin between 1st & 2nd toes
Tibialis Anterior
Deep peroneal n.
Extensor Hallucis longus
Deep peroneal n.
Extensor digitorum longus
Deep peroneal n.
Peroneus Tertius
Deep peroneal n.
Peroneus longus
Superficial peroneal n.
Peroneus brevis
Superficial peroneal n.
Gastrocnemius
Tibial n.
Soleus
Tibial n.
Plantaris
Tibial n.
Popliteus
Tibial n.
Flexor hallucis longus
Tibial n.
Flexor digitorum longus
Tibial n.
Tibialis posterior
Tibial n.
Lateral dorsal cutaneous n.
Continuation of sural nerve into foot
skin on lateral side
Medial & intermediate dorsal cutaneous n.
Branches of superficial peroneal n.
Skin on middle dorsum of foot
Extensor digitorum/hallucis brevis
Lateral branch of deep peroneal n.
Calcaneal branches
From tibial n.
Supply skin of heel
Medial plantar n.
Branch of tibial n. - larger than lateral plantar n.
Supplies skin to medial 3 1/2 digits (Divides into 3 common plantar digital n., Each gives rise to 2 proper plantar digital n.)
Muscles: Abductor hallucis, Flexor digitorum brevis, Flexor hallucis brevis, 1st lumbrical
Lateral plantar n.
Branch of tibial n.
Supplies skin to lateral 1 1/2 digits (One common plantar digital n. - 2 proper plantar digital n. )
Motor to rest of intrinsic plantar muscles
Abductor hallucis
Medial plantar n.
Flexor digitorum brevis
Medial plantar n.
Flexor hallucis brevis
Medial plantar n.
1st lumbrical
Medial plantar n.
Quadratus plantae
Lateral plantar n.
Abductor digiti minimi
Lateral plantar n.
Flexor digiti minimi brevis
Lateral plantar n.
2nd-4th lumbricals
Lateral plantar n.
Plantar & dorsal interossei
Lateral plantar n.
Adductor hallucis
Lateral plantar n.