Lab 4: Abdomen Flashcards Preview

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Flashcards in Lab 4: Abdomen Deck (24)
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what are the 4 muscles and 2 sheets of strong fascia that, along with skin, make up the abdominal wall and support the heavy abdominal viscera?

1. external abdominal oblique
2. internal abdominal oblique
3. rectus abdominis
4. transversus abdominis

1 & 2: the external lamina of the rectus sheath made up of the aponeurotic tendons of the internal and external abdominal oblique muscles


origin and insertion of the external abdominal obliques

origin: the ribs and thoracolumbar fascia
inserts: tuber coxae, linea alba and the iliac fascia


what covers the external abdominal oblique?

abdominal tunic


origin and insertion of the internal abdominal oblique

origin: tuber coxae and inguinal ligament
insertion: costal cartilages and the rib of T18


what is located in the paralumbar fossa? (2 distinct structures)

1. branches of spinal nerves T18 - L2 running over the internal abdominal oblique

2. branches of the deep circumflex iliac artery running over the transversus abdominis


what organs are seen on the right aspect of the horse? (5 organs)

1. cecum
2. dorsal ascending colon (aka dorsal large colon)
3. ventral ascending colon (aka ventral large colon)
4. right kidney
5. liver


what organs are seen on the left aspect of the horse (4 organs)

1. spleen
2. stomach
3. left kidney
4. jejunum


how is the descending duodenum secured in the abdomen?

it is suspended by the mesoduodenum


what are the two types of coiled intestine on the left side and what are there descriptions?

1. jejunum - coiled, small diameter
2. descending (small) colon - thicker, with a whitish longitudinal band


what are the 3 divisions that make up the cecum?

1. base - located dorsally
2. body - comma-shaped
3. apex


how is the ileum differentiated from the jejunum?

the ileum is whitish and paler in color than the jejunum and has a firmer wall


what connects the ileum to the cecum?

the ileocecal fold


what connects the cecum to the right ventral colon?

the cecocolic fold


what is another name for the ascending colon?

the large colon


what are the 4 parts of the large colon?

1. the right ventral colon
2. the left ventral colon
3. the left dorsal colon
4. the right dorsal colon


which part of the large colon is identified by its many sacculations?

the left and right ventral colon


which part of the large colon is identified by its smooth surface?

the right and left dorsal colon


what does the pelvic flexure connect? and what is its clinical significance?

the pelvic flexure connects the left ventral colon to the left dorsal colon.
it is a point of constriction which is a major cause of obstruction and subsequently colic.


where is the transvere colon located within the abdomen?

midline just cranial to the root of the mesentary


how is the descending colon (aka small colon) suspended in the abdomen?

it is suspended by the mesocolon


when does the small colon become the rectum?

after it passes through the pelvic inlet the small colon becomes the rectum


what connects the proximal end of the descending colon to the distal end of the duodenum?

the duodenocolic fold


what is the significance of the duodenocolic fold?

it is important for proper identification of intestinal segments during surgery


what structures can be palpated per rectum?

1. pelvic flexure
2. large colon
3. distal small colon
4. left kidney
5. root of the mesentary
6. cecum

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