vasculature and nerves of posterior gluteal/ thigh

Question 1

What are the distributions of the superior (L1-3), middle (S1-S3) and inferior (post cutaneous nerve of thigh) clunial nerves

Answer 1

the skin of the gluteal region

Question 2

What is the origin of the sciatic nerve?

Answer 2

Sacral plexus, L4-S3

Question 3

What is the course of the sciatic nerve?

Answer 3

leaves pelvis through greater sciatic foramen
inferiolaterally under the cover of gluteus maximus
descends on adductor magnus
crossed by long head of biceps femoris

Question 4

What is the distribution of the sciatic nerve?

Answer 4

all muscles in posterior compartment of thigh, leg and foot muscles

Question 5

Describe the course and distribution of posterior cutaneous nerve of thigh? (S1-S3)

Answer 5

Greater sciatic foramen
deep to gluteus maximus
descends in posterior thigh deep to fascia lata
supplies skin of gluteal region through inferior clunial nerve, skin over posterior thigh and calf, upper medial thigh

Question 6

Describe the course and distribution of superior gluteal? (L4-S1)

Answer 6

between gluteus medius and minimus

supplies gluteus medius/ minimus/ tensor fasciae latae

Question 7

Describe the course and distribution of inferior gluteal? (L5-S2)

Answer 7

Greater sciatic foramen and divides

innervates gluteus maximus

Question 8

Describe the course and distribution of nerve to quadratus femoris? (L4-S1)

Answer 8

leaves through greater sciatic foramen deep to sciatic nerve

inferior gemellus and quadratus femoris

Question 9

Describe the course and distribution of pudendal nerve? (S2-S4)

Answer 9

descends posterior to sacrospinous ligament, enters perineum through lesser sciatic foramen
perineum

Question 10

Describe the course and distribution of nerve to obturator internus? (L5-S2)

Answer 10

descends posterior to ischial spine, enters lesser sciatic foramen.
supplies sup gemellus and obturator internus

Question 11

What is the course and distribution of the superior gluteal artery?

Answer 11

from internal iliac
superficial branch leaves >sciatic foramen, anastamoses with inferior gluteal and medial circumflex femoral arteries, supplies glut max
deep branch runs between ad supplies glut med and min and supplies tensor facsiae latae

Question 12

What is the course and distribution of the inferior gluteal artery?

Answer 12

descends medially to sciatic nerve, anastamoses with sup gluteal, med/ lat circumflex femoral and 1st perforating
supplies glut max, obt int, quad fem, sup hamstrings

Question 13

What is the distribution of the internal pudendal artery?

Answer 13

external genetalia, muscles in perineum

Question 14

What is the course and distribution of the perforating arteries?

Answer 14

from profunda femoris artery
pierce adductor magnus to enter posterior thigh and medial intermuscular septum, supplies branches to hamstring then pierces lateral intermuscular septum to supply anterior compartment.