Lumbar plx

Question 1

lumbar plx

Answer 1

from union of ventral rami T12-L4 spinal nerves

branches;
1) iliohypogastric n (laterally from psoas major)
2) ilioinguinal n (laterally from psoas major)
3) genitofemoral n (ventrally from psoas major)
4) lateral cut. femoral (lateral from psoas major)
5) femoral n (laterally from psoas major)
6) obturator n (medially from psoas major)

Question 2

1) Iliohypogastric nerve

Answer 2

-runs laterally from psoas major, below subcostal nerve
-passes milli muscles of abd wall og along iliac crest to get to subq tissue

*motor: Transversus abdominis og obliquus abdominis internus

*sensory:
Ant.cut ramus (round superficial inguinal ring), pubic region

Lateral.cut ramus: lateral gluteal reg

Question 3

Ilioinguinal nerve

Answer 3

runs laterally from psoas major, below iliohypogastric n.
passes thru mm of abd.wall and thru inguinal canal
enters subq tissue around ext. genital organs

*motor: Transversus abdominis og Obliquus abd. internus

*sensory:
-skin, medially from inguinal ligg
-skin, ext.genital organs (scrotum, penis, labia majora) –>
ant.scrotal/ant.labial nn

Question 4

Genitofemoral n

Answer 4

Pierces thru psoas major–>
-Femoral ramus passes under inguinal ligg, thru lacuna vasorum, to subq tissue above fem.triangle
-Genital ramus, thru inguinal canal to ext.genital organs

*Femoral br: sensory, skin over fem.triangle

*Genital br:
motor-cremaster m
sensory-skin (scrotum,labia majora)

Question 5

Lateral cut. femoral n

Answer 5

runs laterally from psoas major, across iliac fossa and
under inguinal ligg, thru lacuna musculorum, to reach
lateral thigh subq tissue.

*sensory: skin lateral thigh

Question 6

Femoral nerve

Answer 6

laterally from psoas major, across iliac fossa (below lateral cut. femoral n). Below inguinal ligg, thru lacuna musculorum to
fem.triangle. (located lateral to femoral artery in triangle)

*Motor: iliopsoas, sartorius, pectineus og quadriceps femoris

*Sensory: anterior cut. rr: skin on anterior thigh

OG saphenous nerve er branch frá femoral nerve

Question 7

Saphenous nerve

Answer 7

-starts in femoral triangle og enters adductor canal
(accompanied by femoral a+v)
cont. subq on medial side knee (acc. by gr saphenous vein).
-In distal adductor canal–>Infrapatellar br(for skin genual joint)

*Sensory: skin medial leg, skin medial dorsum

Question 8

Obturator nerve

Answer 8

-medially from psoas major
-thru obturator canal (under sup.ramus pubic bone)
-leaves obturator canal under adductor brevis

*motor: mm of medial gr
*sensory: skin medial thigh