muscles of posterior abdominal wall

Question 1

what are the abdominal aspect of the diaphragm structures?

Answer 1

right and left crus
median arcuate ligament
medial arcuate ligament
lateral arcuate ligament

Question 2

weakness in the right crus contributes to what problem?

Answer 2

hiatal hernia

Question 3

does the left crus contribute to a hiatal hernia?

Answer 3

no only the right;

the left is smaller and shorter than the right crus

Question 4

where does the right crus originate?

Answer 4

L1-3; splits around esophagus

Question 5

where does the left crus originate?

Answer 5

L1-2; smaller and shorter than right

Question 6

what does the median arcuate ligament connect?

Answer 6

left and right crus and forms border of aortic hiatus

Question 7

what does the medial arcuate ligament connect?

Answer 7

body of L1 to TP of L1; passes over psoas major and sympathetic trunk

Question 8

what does the lateral arcuate ligament connect?

Answer 8

L1-12th rib; passes over quadratus lumborum

Question 9

what is the function of the psoas major muscle?

Answer 9

flexes thigh and trunk

Question 10

what is the nerve innervation of psoas major?

Answer 10

lumbar nerve 1-3

Question 11

what percent of people have a psoas minor?

Answer 11

60%

Question 12

what is the innervation of the psoas minor?

Answer 12

L1 nerve

Question 13

what is the function of the iliacus?

Answer 13

flexes thigh, tilts pelvis forward

Question 14

what is the nerve of the iliacus?

Answer 14

branches of femoral nerve L2-3

Question 15

which muscle is involved in coughing and forced expiration?

Answer 15

quadratus lumborum

Question 16

what is the innveration of the quadrates lumborum?

Answer 16

subcostal nerve, lumbar nerves 1-4

Question 17

what is the lumbar plexus formed by?

Answer 17

anterior primary rami L1-3 and part of L4

Question 18

what are the branches of the lumbar plexus?

Answer 18

Iliohypogastric
Ilioinguinal 
Genitofemoral- on top of psoas major 
Lateral cutaneous nerve of thigh 
Femoral 
Obturator

Question 19

where does the abdominal aorta run?

Answer 19

passes through aortic hiatus and descends anterior to the vertebral bodies

Question 20

anterior to the 4th lumbar, what does the abdominal aorta bifurcate into?

Answer 20

right and left common iliac arteries

Question 21

what does each common iliac artery bifurcate into?

Answer 21

internal and external lilac

Question 22

what are the 9 branches of the abdominal aorta?

Answer 22

Celiac trunk 
Superior mesenteric artery
Inferior mesenteric artery 
Inferior phrenic artery 
Middle suprarenal artery 
Renal artery 
Gonadal artery
Lumbar arteries 
Median sacral artery