Flashcards in Lab 4: Abdomen Deck (24):
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?
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)
2. dorsal ascending colon (aka dorsal large colon)
3. ventral ascending colon (aka ventral large colon)
4. right kidney
what organs are seen on the left aspect of the horse (4 organs)
3. left kidney
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
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