Sacral plexus

Question 1

Sacral plexus

Answer 1

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)

Question 2

Superior Gluteal nerve

Answer 2

L4 / S1
Exits pelvis via greater sciatic foramen superior to piriformis

Motor to Glut med, min and TFL
No sensory function

Question 3

Inferior gluteal nerve

Answer 3

L5 / S2
Exits pelvis via greater sciatic foramen inferior to piriformis

Motor to Glut Max

Question 4

Sciatic nerve

Answer 4

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

Question 5

Tibial nerve

Answer 5

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.

Question 6

Common fibular nerve

Answer 6

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.

Question 7

Posterior cutaneous of the thigh

Answer 7

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

Question 8

Pudendal nerve

Answer 8

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