Flashcards in Abdomen III Deck (55)
What are the layers of the posterior abdominal wall, starting w/the deepest?
1. Bony layer
4. Visceral layer
5. Partial peritoneal layer
What bones form the bony layer of the post abd wall?
- Iliac bone (iliac fossa + crest)
- Lumbar vertebrae
- Last 2 ribs
What mm. form the m. layer of the post abd wall?
Psoas major, psoas minor (may be absent), iliacus & quadratus lumborum mm.
What organs lie retroperitoneally at the post abd wall's visceral layer?
- Suprarenal glands
- Abd aorta + IVC
(basically kidney stuff + aorta)
What n. plexus is formed in the area of the post abd wall?
What fascia are at the post abd wall?
- Psoas fascia
- Iliac fascia
- thoracolumbar fascia
Iliacus m: OIIA?
O: Sup 2/3 iliac fossa, ala of sacrum, ant sacro-iliac ligaments
I: Lesser trochanter of femur and shaft inf to it, and to psoas major tendon
I: Femoral n.
A: Flexes hip and stablizes hip joint; acts w/psoas major m.
Psoas major m: OIIA?
O: Transverse process of lumbar vertebrae, sides of bodies of T12-L5 + intervening discs
I: Lesser trochanter of femur
I: Ventral rami of first 4 lumbar nn.
A: Acting superiorly w/iliacus, flexes hip; acting inferiorly, flexes vertebral column laterally; used to balance trunk in sitting position; acting inferiorly w/iliacus, flexes trunk
Psoas minor m: OIIA?
O: Vertebral margins of T12-L1 + their intervertebral discs
I: Pectineal line, iliopectineal eminence
I: Ventral rami of 1st lumbar n.
A: Flexes pelvis on vertebral column
Quadratus lumborum m: OIIA?
O: Medial half of inf border of 12th rib, tips of lumbar transverse processes
I: Iliolumbar ligament, internal lip of iliac crest
I: Ventral rami of T12 and first 4 lumbar nerves
A: Extends and laterally flexes vertebral column, fixes 12th rib during inspiration
O: Xiphoid process (sternal part), lower 6 costal cartilages (costal part), L1-L3 vertebrae (lumbar part)
I: *Central tendon (converges at midline)
I: Phrenic n.
A: Chief m. of resp, draws central tendon down and forwards
What are the elevated right and left regions of the diaphragm called?
Which is higher?
Right and left copula
- right is higher
What is the insertion of the diaphgram?
Central tendon (converging aponeuroses)
The right crus of the diaphragm runs up to partially form the _________ and runs down to form the _________.
- esophageal hiatus
- suspensory ligament of duodenum
Where does the left crus of the diaphragm arise from?
Bodies of upper 2 L-vertebrae.
Where does the right crus of the diaphragm arise from?
Upper 3 lumbar vertebrae
(larger, stronger, longer than left)
The median arcuate ligament forms the __________ by uniting crossing crura
The medial arcuate ligaments run across the upper portion of what?
Psoas major m.
The lateral arcuate ligaments run across the upper portion of what?
Quadratus lumborum m.
What else comes thru the esophageal hiatus w/the esophagus?
2 vagus nn.
What travels through the aortic hiatus?
What vertebral nn. makeup the lumbar plexus?
Where is it formed?
T12/L1/L2/L3/L4/(L5), ventral rami
- Inside psoas major m.
What supplies the subcostal n?
What supplies the iliohypogastric n?
What supplies the ilioinguinal n?
*What does this nerve run though?
*Superficial inguinal ring
What supplies the femoral n?
L2, L3, L4
What supplies the obturator n?
L2, L3, L4
What's common b/w the subcostal, iliohypogastric, ilioinguinal, and lateral femoral cutaneous nn. initial locations?
All run in front of quadratus lumborum m.
*Which n. accompanies the spermatic cord/round ligament of uterus, continues thru inguinal canal, and emerges thru the superficial inguinal ring?