topic 12

Question 1

Nerves of the lumbar plexus

Answer 1

1.Iliohypogastric & 2.ilioinguinal: L1

3.Genitofemoral nerve- l1 & l2
4.Lateral femoral cutaneous -L2 & L3

5.Obturator nerve - L2 to L4
same for 6.Femoral nerve

mnemonic: I twice Get Laid On Fridays/ 2-1, 2-2, 2-3

Question 2

coursing of nerve of lumbar plexus

Answer 2

-Iliohypogastric: introlaterally towards ant aspect of iliac crest
-Ilioinguinal : inferior to iliohypogastric, at level of iliac crest, lies medial to iliohypogastric
-Genitofemoral: pierces psoas major, continues downward & medially to inguinal and femoral canal
-Lateral f.c : interolateral side of iliac fossa & passes in deep lateral portion of inguinal lig.
-Obturator: along post. pelvic cavity , travels through through obturator formane where it splits
-Femoral : lat. part of inguinal lig and enters femoral canal lat. to all femoral vessels (N,A,V)

Question 3

muscles and areas supplied by nerve of lumbar plexus

Answer 3

1.internal oblique and transversus abdominis and then divides into two cutaneous terminal branches: a lateral branch -small area of the upper lateral buttock & anterior branch- small skin area above the pubis

2 : transervessus abdmoninis muscle & internal oblique muscle

3.Genital branch:In males-lateral scrotal skin and cremaster muscle & in females-mons pubis, labia majora/ Femoral branch : skin overlying femoral triangle

4.Skin of lat. part of thigh to knee & perineum of iliac fascia

5.Post.branch: Obturator externus & adductor magnus / Anterior branch: adductor longus, brevis, gracilis & pectineus

6.muscular branch: Iliopsoas, pectineus,sartorius & quadriceps femoris/ ant.cutaneous branch: skin of anteromedial thigh /saphenous nerve :skin of the medial knee, leg, and foot