Abdominal Musculature Flashcards
What are the three muscles in the posterior abdominal wall?
- psoas major
- iliacus
- quadratus lumborum.
What passes through the lateral arcuate ligament?
The quadratus lumborum
What passes through the medial arcuate ligament?
psoas major
What does the median arcuate ligament form?
the aortic hiatusNOTE: Another name for “arcuate ligament” is “lumbocostar arch”.
What does the quadratus lumborum do?
It is is a postural muscle for the lower trunk
What do the psoas major and iliacus do?
They flex the hip
What structures pierce the diaphragm?
- IVC
- Esophagus
- Aorta
- Thoracic duct
- Parts of the ANS systems: A. Vagus nerve
B. Sympathetic trunk
What portion of the diaphragmatic muscle attaches to the xiphoid process?
the sternal portion of the diaphragm
What are the parts of the diaphragm?
costal, sternal, and lumbar
What does the lumbar part of the diaphragm attach to?
the bodies of upper lumbar vertebrae, to the transverse process of L1, and to the tip of the 12th rib.
T or F. The transpyloric plane passes through the hilum of each kidney
T
The transpyloric plane runs through the hilum of which kidney?
Both, even though the right kidney is more inferior than the left kidney
Describe the veinous return of the kidneys
the left and right renal veins empty directly into the IVC
What are the kidneys and the suprarenal glands protected by?
renal fascia (which branched from the transversalis fascia (and then splits on the anterior and posterior side of the kidneys) surround each kidney and suprarenal gland. In between the renal fascia and the kidney is peritoneal fat and outside the renal fascia is pararenal fat
What are the three sources of arterial supply to the suprarenal glands?
superior, middle, and inferior suprarenal arteries
Where does the superior suprarenal arteries branch off of?
they are branches from the inferior phrenic artery (which branches directly from the abdominal aorta above the celiac trunk)NOTE: these arteries (~3-4 per suprarenal gland) supply the upper, medial aspect of each gland
Where does the middle suprarenal arteries branch off of?
directly off the abdominal aorta and supplies the medial, middle aspect of the gland
Where does the inferior suprarenal arteries branch off of?
off of the right and left renal arteries (which branch directly from the abdominal aorta lateral to the SMA and below the celiac trunk)
The the ileoinguinal and ileohypogastric nerves arise from what nerve root?
L1NOTE: these arise from the lumbar plexus and usually arise together as a single nerve that then splits.
The lateral femoral cutaneous nerve arises from what nerve root?
L2 primarily with contribution from L3
T or F. The lateral femoral cutaneous nerve is parallel to the ileoinguinal and ileohypogastric nerves but is more inferior
T
The femoral nerve arises from what nerve root?
L2-, L3, and L4
The obturator nerve arises from what nerve root?
L2-L4
The genitofemoral nerve arises from what nerve root?
L1-L2
What are the nerves of the lumbar plexus?
subcostal, ilioinguinal, iliohypogastric, lateral femoral cutaneous, femoral, obturator, lumbosacral trunk
What nerve roots does the genitofemoral nerve arise from?
L1-L2
What does the genitofemoral nerve run with?
the muscle of psoas major
Psoas Major origin
bodies of Lumbar Vertebrae
Psoas Major insertion
Lesser Trochanter of Femur
Psoas Major innervation
L1-L3 ventral rami
Psoas Major action
hip flexion
Psoas Minor origin
Bodies of Lumbar V ertebrae
Psoas Minor insertion
pectineal line
Psoas Minor innervation
lumbar plexus
Psoas Minor action
Weak Flexion of the Vertebral Column
Quadratus Lumborum origin
12th rib
Quadratus Lumborum insertion
iliac crest
Quadratus Lumborum innervation
lumbar plexus
Quadratus Lumborum action
Stabilize Rib XII and Lateral Bending of Trunk
Iliacus origin
Iliac Fossa
Iliacus insertion
Lesser Trochanter of Femur
Iliacus innervation
Femoral N. (L2- L4)
Iliacus action
Flexion of the Hip
