We examine the gastrointestinal tract of a donkey in dorsal recumbency (on its back) much as one...
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![Page 1: We examine the gastrointestinal tract of a donkey in dorsal recumbency (on its back) much as one might do this in abdominal surgery. For the exposure that.](https://reader034.fdocuments.us/reader034/viewer/2022051416/56649e165503460f94b01abd/html5/thumbnails/1.jpg)
We examine the gastrointestinal tract of a donkey in dorsal recumbency (on its back) much as one might do this in abdominal surgery. For the exposure that we use in this presentation, the incisions are different and, as the specimen is preserved, the midventral abdominal incision is much larger than it would be were we actually performing the surgery.
Exploration of the viscera would not be markedly different in a horse. See the presentation, “Equine Abdominal Topography”, for review.
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R L
1. Cut along long axis.
2. Cut along transverse axis (at level of last rib).
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epidermis
dermissubcutaneous c.t.
(superficial fascia)
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The skin is made up of two layers, a superficial epithelial layer, the epidermis, which is thin, and the dermis, which is a much thicker layer of connective tissue on which the epidermis rests.
The epidermis is usually pigmented and probably no more than 100 microns thick.The dermis is the deeper layer of the skin, continuous with the underlying subcutaneous tissue (superficial fascia).
Different from the fairly uniform epidermis, the thickness of the dermis is variable and depends on the area of the body. In the case of the abdomen, the dermis is thin ventrally, perhaps two to four millimeters thick on average, and becomes gradually thicker as the dorsal midline is approached.
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At the sternal end of your longitudinal incision, make a stab incision through the ventral body wall. Go only about ½” deep.
Ventral body wall.
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Use the blunt end of hemostatic forceps to push through the peritoneum to enter the abdominal cavity.
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Now put your finger through the hole that you’ve made and lift the abdominal wall away from the viscera.
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You’re still not through the peritoneum. You’re looking at the internal lamina of the rectus sheath.
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Now you’ve carefully cut through the internal lamina and the peritoneum and you’re looking at abdominal viscera. Lifting the body wall away from the viscera, cut along your longitudinal and transverse incisions to expose the viscera.
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Abdominal viscera exposed:
RL
cecum
Left parts of large colon.
Right parts of large colon.
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cecu
m
large colon, left parts
large colon, right parts
cecocolic fold
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left ventral colon
right ventral colon
cecu
m
desc/sigmoid colon
jejunum
cecocolic fold
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Lift up on the apex of the cecum to demonstrate the cecocolic fold.
cecocolic fold.
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Pull on the apex of the cecum to demonstrate the cecocolic fold. The fold extends from the lateral tenia of the cecum to the right ventral colon.
cecocolic fold
???
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Draw the cecum away from the viscera as shown.
cecocolic fold
???
??? must be the right ventral colon.
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cecum
ileocecal fold
ileum
jejunum
The cecum is turned back, to the right, to show the ileocecal fold.
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The ileocecal fold extends from the dorsal tenia of the cecum to the ileum. As a matter of definition, the ileojejunal junction is where the ileocecal fold ends.
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Follow the left parts of the large colon caudally. Note that they curve to the right or enter the pelvic inlet. Find the pelvic flexure and draw it out.
CECUM
RT VENT COL
LT VENT COL
Follow the left parts of the large colon caudally. Note that they curve to the right or enter the pelvic inlet. Find the pelvic flexure and draw it out.
RT VENT COLLEFT VENT COL
CECUM
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Follow the left parts of the large colon caudally. Note that they curve to the right or enter the pelvic inlet. Find the pelvic flexure and draw it out.
CECUM
RT VENT COL
LT VENT COL
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Pelvic flexure
LT VENT COL
LT DORS COL
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left vent colon with haustra
left dors colon no haustra
single tenia, mesentery
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Pelvic flexure and left parts of the large colon drawn to the right with the cecum out of the body cavity.
cecum
coils of jejunum (no teniae)
rt dors col
rt vent col
left parts of large colon
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desc/sigmoidcolon (with teniae)
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View from the right side.Pelvic
flexure
cecumCecum, pelvic flexure, left parts, and a little of the right parts of large colon drawn out of abdomen, right view.
pelvic flexure
cecum
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Right Side Left Side
right ventral colon
left ventral colon
cecum
jejunum
sternal flexure diaphragmatic flexure
From: Anatomie des Pferdes, W. Ellenberger, H. Baum; 1897. Verlags- buchhandlung Paul Parey
small colon
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Coils of jejunum moved out of the way to show the ileum joining the base of the cecum.
ileocecal junction
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Following the jejunum to the duodenojejunal flexure at the cranial end of the duodenocolic fold.
ascending duodenum
jejunum
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duodenojejunal flexure
transv colon
desc colonascnd
duod
jejunum
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coils of small colon leading to the rectum
right dorsal
colon
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mesocolon of desc/sigmoid colon
right dorsal colon jejunum
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Replace coils of small colon….
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Replace coils of jejunum ventral to coils of small colon…
cecum
right ventral colon
right dorsal colon
jejunum
transv colon
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Replace left parts of large colon ventral to jejunal coils…
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Replace the cecum.