Final Exam: Abdominal Cavity Flashcards
What two plans divide up the abdomen into four quadrats?
midsaggital plane and transumbilical plane
If a patient claims of pain in his lower left quadrant, what viscera do you need to consider?
sigmoid colon, inferior descending colon, left ovary and fallopian tube, left ureter, left spermatic cord
What parts make up the large intestine, in order?
- the ilium of the SI dumps into the LI, which begins with the cecum
- cecum -> ascending colon -> transverse colon -> descending colon -> sigmoid colon -> rectum
Describe the flow of the small intestine.
1) duodenum comes off pylorus of the stomach; smallest and first part of the SI
2) jejunum
3) ilium
Where would you find pain if a patient has a ruptured appendix?
right lower quadrant
What contents make up the right upper quadrant?
right lobe of liver, gallbladder, superior ascending colon, pylorus of stomach, some duodenum, head of pancreas, right kidney, right transverse colon, right adrenal gland
Which abdominal quadrant is the spleen in?
left upper quadrant
Describe the fascia above and below the umbilicus. What layer continues as colles fascia, and where does this go?
- above: camper fascia (superficial fatty layer)
- below: camper fascia and scarpa fascia
• (scarpa = deep membranous layer that continues as colles fascia in perineal region)
What is the superior bony marking of the abdominal wall?
xiphoid process and costal margin
The linea alba is a fusion of what? What is the linea semilunaris?
- fusion between the right and left halves of the rectus sheath
- linea semilunaris = lateral border of rectus sheath
T/F: Rectus abdominus is a major core stabilizer.
- false; doesn’t originate on thoracolumbar fascia so it’s not a core stabilizer
- external oblique doesn’t core stabilize either
What actions does the internal abdominal oblique do?
- ipsilateral side bend
- ipsilateral trunk rotation
- bilateral trunk flexion
- eccentric extension
• external oblique does same, just contralateral rotation
What muscle tenses the linea alba?
pyramidalis
What way do the external oblique muscle fibers run?
same as external intercostals, inward like your hands in your pockets
How do external and internal obliques rotate the trunk?
external contralateral rotation, internal ipsilateral rotation
What muscles do the iliohypogastric and ilioinguinal nerves (L1 branches) help innervate?
internal obliques and transverse abdominus
Which oblique is a very important core stabilizer?
transverse abdominus
What is diastasis recti? What can cause it? How do we treat it?
- condition where the linea alba is stretched and abdominal wall is separated (rectus abdominus sides further apart, 2-3 finger breadths)
- poor ab strength or pregnancy can cause this
- treat with core stabilization
What is the conjoint tendon?
lower part of transverse abdominus, joints with the internal oblique
The inguinal ligament is a continuation of what? What is the lacunar ligament?
- continuation from aponeurosis of external oblique and attaches to pubic tubercle
- lacunar lig = medial, thicker part of inguinal ligament
What muscle should be one of the first core contractors for movements such as vacuuming, reaching, etc? What muscle co-contracts with it?
transverse abdominus and multifidus
The delayed onset of contraction for the transverse abdominus indicates what?
motor control deficit and inefficient muscle stabilization for spine
What is the arcuate line, and why is it significant? What’s found above and below it?
- arcute line is the inferior marker of the rectus sheath; it’s the horizontal division between the umbilicus and pubic symphysis
- above line = rectus sheath
- below = no rectus sheath, just transversalis fascia
What is the rectus sheath? How is it formed?
- fibrous compartment of the rectus abdominal muscle
- formed from the lateral abdominal muscles coming in and enclosing the rectus abdominus
T/F: Between the ASIS and pubis, there are still oblique muscles there forming the posterior wall.
false, all muscles form anterior wall between the ASIS and pubis area
What muscle splits to enclose the rectus abdominus?
internal oblique
What muscles form the anterior and posterior walls ABOVE the arcuate line? What about below the line?
ABOVE line:
- anterior = external oblique, half of internal oblique
- posterior = half of internal oblique, transverse abdominus
BELOW line:
- anterior = all muscles
- posterior = transversalis fascia
What nerve supplies the skin to the upper inguinal region?
iliohypogastric
What nerve supplies the skin over lower inguinal region to thigh?
ilioinguinal
What makes the border of the lumbar triangles? Why are these potential sites for herniation?
- borders = latissimus dorsi, iliac crest, external oblique
- not much muscle in the triangle, so viscera can get pushed through
What abdominal muscles attach onto the thoracolumbar fascia?
transverse abdominus and internal obliques (lats and multifidus do as well)
What is the nerve supply for the abdominal region?
thoracoabdominal nervers, ilioinguinal, and iliohypogastric
T/F: External oblique attaches on the thoracolumbar fascia.
false
What’s the strongest layer of the thoracolumbar fascia and where is it found? What does it insert on?
- posterior layer is strongest, found superficial to erector spinae
- surrounds erector spinae and multifidus
- inserts on SI ligaments, sacral crest, and sacrotuberous ligament
Discuss the three layers of the thoracolumbar fascia.
1) anterior layer: in front of quadratus lumborum
2) middle layer: between quadratus lumborum and erector spinae
3) posterior layer: behind erector spinae
How is the iliolumbar ligament formed?
via thickening of the anterior layer of the thoracolumbar fasica
During fetal development, what are the walls of the inguinal canal made up of?
abdominal muscles
What causes the testes to drop and when?
In the 5th week of development, there’s a surge of hormones that cause the testes to drop from posterior abdominal wall because it’s too warm
What tugs on the testes to pull them down?
gubernaculum pulls them through inguinal canal
The testes are originally fixed on the posterior abdominal wall by what ligament?
suspensatory (diaphragmatic) ligament
What is the opening to the inguinal canal called? What’s the entryway?
deep ring is the opening to the inguinal canal, and through the transversalis fascia is the entryway
What is the spermatic cord?
the cord of nerves, lymphs, vessels, and muscles brought down with the descention of the testes
What is the exit point of the inguinal canal, and what is the exitway?
exit point is superficial ring via the aponeurosis of external oblique muscle
T/F: Layers of the abdominal wall are brought down as the testes descend.
true
Explain the path the testes take when they descend.
- tugged by gubernaculum through the deep ring (via transversalis fascia) and then through the superficial ring (via aponeurosis of ext. oblique) and into the scrotum
What’s the path of the round ligament for females?
ligaments begins at uterus, pierces through deep ring, exits via superficial ring and inserts on the labia majora
What are potential sites for hernias discussed in this chapter?
- diastisis recti
- lumbar triangles
- deep and superficial inguinal rings
Where is the deep ring located?
halfway between ASIS and pubic symphysis
T/F: The deep ring lies medial to the inferior epigastric artery.
- false, lies lateral
- the SUPERFICIAL ring lies medial to the inf. epigastric a.
Where is the superficial ring located?
slightly above and lateral to pubic tubercle
What is the lacunar ligament?
thickening of the external oblique aponeurosis; attaches to pubic tubercle
What does the cremastor muscle do? What’s it innervated by?
- draws testes up to protect them from cold
- supply = genital branch of genital femoral a.