In a cat digestive dissection, the thin membrane that holds abdominal organs in place is the:

Question

BlackTom AI · Accepted Answer

The membrane that secures the intestines to the posterior abdominal wall and transmits blood vessels, nerves, and lymphatics is the mesentery.

1. Relevant knowledge points and concepts
- Peritoneum: a serous membrane lining the abdominal cavity and covering abdominal organs.
- Mesentery: a double layer (fold) of peritoneum that attaches portions of the intestine to the dorsal body wall, containing vessels and nerves.
- Pleura: serous membrane around the lungs within the thoracic cavity.
- Pericardium: fibrous/serous sac surrounding the heart.
- Peritoneal cavity: the potential space between parietal and visceral layers of the peritoneum (not itself a membrane).

2. Step-by-step reasoning process
- In a cat digestive dissection one inspects the abdominal cavity and sees the intestines suspended rather than free-floating.
- The structure connecting the intestines to the body wall is a thin, translucent double layer of tissue containing visible blood vessels and small fat deposits.
- This description matches the mesentery (a peritoneal fold) rather than a thoracic membrane or a cavity.

3. Intermediate (observational) steps
- Observe intestine position: suspended and somewhat mobile.
- Locate connecting membrane: thin, shiny, contains vessels—this is the mesentery.
- Note: no numerical calculation is needed; the identification is based on anatomical features.

4. Why the correct answer is correct
- The mesentery is specifically the thin membrane that holds and supports abdominal organs (especially small intestines), providing their vascular and neural supply. Its appearance during dissection (translucent, vascular) matches the question’s description.

5. Why other options are incorrect
- Pleura: located in thoracic cavity around lungs, not abdominal organs.
- Pericardium: surrounds the heart, not the digestive tract.
- Peritoneal cavity: a space between peritoneal layers, not the membrane that physically holds organs; the membrane forming those layers is the peritoneum/mesentery.

6. Conclusion
- Therefore, the correct answer is Mesentery, which matches the provided answer.

In a cat digestive dissection, the thin membrane that holds abdominal organs in place is the:单项选择题

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