Question at position 2 Which of the following organs is supported by a layer of adventitia rather than serosa?large intestinestomachesophagussmall intestine单项选择题
A
large intestine
B
stomach
C
esophagus
D
small intestine

Question

Question at position 2 Which of the following organs is supported by a layer of adventitia rather than serosa?large intestinestomachesophagussmall intestine

BlackTom AI · Accepted Answer

Adventitia is a layer of loose connective tissue that anchors an organ to surrounding structures, whereas serosa is a visceral peritoneum (a mesothelial simple squamous epithelial layer plus underlying connective tissue) that covers organs within the peritoneal cavity and produces serous fluid.

Relevant knowledge points:
- Wall layers of the gastrointestinal tract: mucosa, submucosa, muscularis externa, and outermost layer which is either serosa or adventitia.
- Serosa = visceral peritoneum; covers intraperitoneal organs (e.g., stomach, most of small intestine).
- Adventitia = fibrous connective tissue; found where the organ lies outside the peritoneal cavity or is fixed to body wall (e.g., portions of the large intestine and the entire esophagus in the thorax).

Step-by-step reasoning:
1. Determine location of each organ relative to the peritoneal cavity:
   - Stomach: intraperitoneal → covered by serosa.
   - Small intestine (jejunum, ileum): intraperitoneal → serosa.
   - Large intestine: mixed — transverse and sigmoid colon are intraperitoneal (serosa); ascending and descending colon are secondarily retroperitoneal (adventitia in places). As an option, "large intestine" is ambiguous.
   - Esophagus: runs through the thorax and neck outside the peritoneal cavity and is not covered by peritoneum.
2. Identify outer covering accordingly:
   - Esophagus: outer layer = adventitia (in the thorax and neck). In the abdomen the short abdominal part may have serosa, but the characteristic, prominent covering is adventitia.
3. Conclude which choice is supported by adventitia: esophagus.

Why the correct answer is correct:
The esophagus is primarily a retroperitoneal/mediastinal structure not lined by visceral peritoneum, so its external connective-tissue layer is adventitia rather than serosa.

Why other options are incorrect:
- Stomach and most of small intestine are intraperitoneal and covered by serosa.
- "Large intestine" is partially intraperitoneal (serosa) and partially retroperitoneal (adventitia), so as a general choice it is ambiguous; the clearly correct single answer is esophagus.

Final confirmation: the correct answer is esophagus.

Question at position 2 Which of the following organs is supported by a layer of adventitia rather than serosa?large intestinestomachesophagussmall intestine单项选择题

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