Test 4: Nerves, Arteries, Veins Flashcards
Inferior gluteal n.
Course
Greater sciatic foramen (inferior to piriformis) –> branches off
Inferior gluteal n.
Origin
Sacral plexus (L5-S2)
Inferior gluteal n.
Distribution
Gluteus Maximus
Superior gluteal n.
Origin
Sacral plexus (L4-S1)
Superior gluteal n.
Course
Greater sciatic foramen (superior to piriformis) –> runs between gluteus medius and minimus
Superior gluteal n.
Distribution
Gluteus medius
Gluteus minimus
TFL
Posterior femoral cutaneous n.
Origin
Sacral plexus (S1-S3)
Posterior femoral cutaneous n.
Course
Greater sciatic foramen (inferior to piriformis) –> under gluteus Maximus –> descends under fascia lata –> branches off
Posterior femoral cutaneous n.
Distribution
Skin of buttock, posterior thigh/calf
Lateral perineum
Upper medial thigh
Pudendal n.
Origin
Sacral plexus (S2-S4)
Pudendal n.
Course
Greater sciatic foramen (inferior to piriformis) –> descends posterior to sacrospinous lig –> enters perineum via lesser sciatic foramen
Pudendal n.
Distribution
Perineum
N. to obturator internus
Origin
Sacral plexus (L5-S2)
N. to obturator internus
Course
Greater sciatic foramen (inferior to piriformis) –> descends posterior to ischial spine –> lesser sciatic foramen –> obturator internus
N. to obturator internus
Distribution
Superior gemellus
Obturator internus
N. to quadratus femoris
Origin
Sacral plexus (L4-S1)
N. to quadratus femoris
Course
Leaves pelvis via Greater sciatic foramen deep to sciatic n.
N. to quadratus femoris
Distribution
Hip joint
Inferior gemellus
Quadratus femoris
Sciatic n.
Origin
Sacral plexus (L4-S3)
Sciatic n.
Course
Greater sciatic foramen (inferior to piriformis) –> gluteal region –> descends deep to biceps femoris –> bifurcated into tibial and common fibular nerves at apex of popliteal fossa
Sciatic n.
Distribution
All muscles in posterior compartment of thigh
Clunial n.
Origin
Superior: posterior rami L1-L3
Middle: posterior rami S1-S3
Inferior: posterior cutaneous n. of thigh
Clunial n.
Course
Superior: crosses iliac crest
Middle: exits through posterior sacral foramina and enters gluteal region
Inferior: curves around inferior border of gluteus Maximus
Clunial n.
Distribution
Skin of gluteal region
Saphenous n.
Origin
Femoral n.
Saphenous n.
Course
With femoral vessels through femoral triangle/adductor canal –> descends with great Saphenous v.
Saphenous n.
Distribution
Skin of medial side of leg and foot
Tibial n.
Origin
Sciatic n.
Tibial n.
Course
Through popliteal fossa –> along tibialis posterior –> terminates at flexor retinaculum (divides into med/lat plantar nerves)
Tibial n.
Distribution
Plantar flexor muscles of posterior compartment of leg and knee
Common fibular n.
Origin
Sciatic n.
Common fibular n.
Course
Follows medial border of biceps femoris/tendon –> posterior head of fibula –> winds around neck of fibula –> divides into deep/superficial fibular nerves
Common fibular n.
Distribution
Skin on lateral part of posterior leg
Knee joint
Superficial fibular n.
Origin
Common fibular n.
Superficial fibular n.
Course
Arises between fibularis longus and neck of fibula –> lateral compartment of leg –> pierces deep fascia
Superficial fibular n.
Distribution
Fibular muscles of lateral compartment of leg
Skin on distal 1/3 of anterior surface of leg
Skin on dorsum of foot
Deep fibular n.
Origin
Common fibular n.
Deep fibular n.
Course
Arises between fibularis longus and neck of fibula –> extensor digitorum longus –> interosseous membrane –> distal end of tibia –> dorsum of foot
Deep fibular n.
Distribution
Dorsiflexor muscles of anterior compartment
Extensor muscles on dorsum of foot
Skin on 1st interdigital cleft
