Sacral plexus Flashcards
(8 cards)
Sacral plexus
Some Interesting Sluts Party Patiently
S – Superior Gluteal Nerve (L4-S1)
I – Inferior Gluteal Nerve (L5-S2)
S – Sciatic Nerve (L4-S3)
P – Posterior Femoral Cutaneous Nerve (S1-S3)
P – Pudendal Nerve (S2-S4)
Superior Gluteal nerve
L4 / S1
Exits pelvis via greater sciatic foramen superior to piriformis
Motor to Glut med, min and TFL
No sensory function
Inferior gluteal nerve
L5 / S2
Exits pelvis via greater sciatic foramen inferior to piriformis
Motor to Glut Max
Sciatic nerve
L4 / S3 Largest nerve in the body
Converge at inferior region of piriformis
At apex of popliteal fossa branches into tibial and common fibular nerve
Tibial nerve
L4 - S3
Motor to gastrocs, soleus and plantaris. Popliteus, tib post, flexor digitorum longus and flexor hallucis longus
Sensory:
Gives branches to sural nerve: lateral gastrocs and foot
Medial calcaneal branches: skin over heel
Medial plantar nerve: plantar surface of the medial three and a half digits.
Lateral plantar nerve: plantar surface of the lateral one and a half digits.
Common fibular nerve
L4 - S2
Motor: short head of the biceps femoris.
Sensory: Innervates the skin of the lateral leg and the dorsum of the foot. (sural nerve)
Superficial fibular nerve:
Motor: fibularis longus and brevis.
Sensory: skin of the anterolateral leg and dorsum of the foot.
Deep fibular nerve:
Motor: tibialis anterior, extensor digitorum longus and extensor hallucis longus.
Sensory: innervates the skin of the first webbed space.
Posterior cutaneous of the thigh
S1 / S3
Exits inferior to piriformis
Superficial to long head of biceps femoris
Terminates with twigs joining the sural nerve
Gives off three branches:
Inferior cluneal nerve
Cutaneous branch – skin of popliteal fossa
Perineal branch – post scrotum or labia
Pudendal nerve
S2 / S4
Exits pelvis via greater sciatic foramen inferior to piriformis
Enters through perineum through lesser sciatic foramen
Pudendal canal – nerve divides into inferior rectal nerve, dorsal nerve of penis or clitoris and perineal nerve