blood supply lower extremity

Question 1

Lumbar plexus sp’s

Answer 1

L1,2,3,4

Question 2

Sacral plexus sp’s

Answer 2

L4,5,S1,2,3,4

Question 3

Coccygeal plexus sp

Answer 3

S4,5, Co

Question 4

Obturator n. Exits the pelvis via

Answer 4

The obturator canal in the obturator membrane

Question 5

Iliohypogastric n.

Answer 5

Origin: L1
Distribution:
M: mm of anterolateral abdominal wall
C: Superolateral gluteal region

Question 6

Ilioinguinal n.

Answer 6

Origin: L1
Distribution:
M: mm of the anterolateral abdominal wall
C: Superomedial thigh / pubic region

Question 7

Genitofemoral n.

Answer 7

Origin: L1,2
Distribution:
M: Cremaster mm (pierces psoas +)
C: Femoral branch, skin of femoral triangle genital branch ant scrotum/labia majora

Question 8

Femoral n.

Answer 8

Origin: L2-L4
Distribution:
M: Quads (group), pectineus, sartorius, iliacus, art. genu
C: anteromedial thigh, med leg, medial dorsal foot (via saphenous n.)

Question 9

Obturator n.

Answer 9

Origin: L2,3,4
Distribution:
M: Adductors (group) pectineus, obturator externus
C: Medial thigh

Question 10

Lateral femoral cutaneus N.

Answer 10

Origin: L2,-3
Distribution:
(only cutaneus)
C: Superolateral thigh, ant/post

Question 11

Superior Gluteal n.

Answer 11

Origin: L4-S1
Distribution:
M: Glute med, min, TFL
C:

Question 12

Inferior Gluteal n.

Answer 12

Origin: L5-S2
Distribution:
M: Glute Max
C:

Question 13

Nerve to piriformis

Answer 13

Origin: S1,2
Distribution:
M: Piriformis
C:

Question 14

Nerve to Quad fem / Inf gemellus

Answer 14

Origin: L4-S1
Distribution:
M: Quad fem + inf gemellus
C:

Question 15

Nerve to Obturator internus / Superior gemellus

Answer 15

Origin: L5-S2
Distribution:
M: Superior gemellus + obturator internus
C:

Question 16

Nerve to levator ani & ischiococcygeus

Answer 16

Origin: S3-S4
Distribution:
M: Levator ani + coccygeus
C:

Question 17

Posterior femoral cutaneus n.

Answer 17

Origin: S1-3
DIstribution:
C:Posterior thigh (not lat portion) up to the popliteal fossa

Question 18

Perforating cutaneus n.

Answer 18

Origin: S2-3
Distribution:
C: Region of skin over ischial tuberosities perforates sacrotuberous lig.

Question 19

Pudendal n.

Answer 19

Origin: S2-S4
Distribution:
M: Ext gemellus, mm of perenium, ext. sphincter, urethral sphincter
C: perenium

Question 20

Sciatic n. tibial portion

Answer 20

Origin: L4-S3
Distribution:
M: Hamstrings (except short HD of biceps fem) Hamstring portion of ADD magnus
C: Posterior leg, lat malleolus, calcaneus, plantar surface of foot

Question 21

Sciatic n. common fibular portion

Answer 21

Origin: L4-S2
Distribution:
M: Biceps femoris (short HD)
C: Lateral ant/post leg + dorsum of foot via terminal branches (except dorsum of 5th)

Question 22

The sciatic n. enters the popliteal fossa and then divides into..

Answer 22

Tibial and common fibular nerves

Question 23

Piriformis divides ____________ into 2

Answer 23

The greater sciatic notch

Question 24

Superficial fibular n. supplies

Answer 24

lateral compartment of leg

Question 25

Deep fibular n. supplies

Answer 25

Anterior compartment of leg

Question 26

Tibial n. supplies

Answer 26

Posterior compartment of leg