open access

Vol 67, No 4 (2008)
ORIGINAL ARTICLES
Published online: 2008-09-30
Submitted: 2012-02-06
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Gross anatomy of the intestine and its mesentery in the nutria (Myocastor coypus)

W. Pérez, M. Lima, A. Bielli
Folia Morphol 2008;67(4):286-291.

open access

Vol 67, No 4 (2008)
ORIGINAL ARTICLES
Published online: 2008-09-30
Submitted: 2012-02-06

Abstract

The intestines and mesentery of the nutria (Myocastor coypus) have not been fully described. In the present study 30 adult nutrias were studied using gross dissection. The small intestine was divided into the duodenum, jejunum and ileum as usual. The duodenum started at the pylorus with a cranial portion, which dilated forming a duodenal ampulla. The ileum was located within the concavity of the caecum and attached to the coiled caecum by means of the iliocaecal fold. The ascending colon had two ansae, one proximal and one distal. The proximal ansa was fixed to the caecum by the caecocolic fold. The base of the caecum and a short proximal part of the ascending colon belonging to the proximal ansa were attached to the mesoduodenum descendens. The distal ansa of the ascending colon had a proximal part which was sacculated and a distal part which was smooth. The two parts of the distal ansa of the ascending colon were parallel and joined by a flexure of variable localisation. The smooth part of the distal ansa of the ascending colon was attached to the initial portion of the descending colon by a peritoneal fold. The short transverse colon was directly attached to the mesoduodenum and greater omentum. In conclusion, we have described the anatomy of the intestines of the nutria and its mesentery in detail, and provided a nomenclature list adapted to the Nomina Anatomica Veterinaria.

Abstract

The intestines and mesentery of the nutria (Myocastor coypus) have not been fully described. In the present study 30 adult nutrias were studied using gross dissection. The small intestine was divided into the duodenum, jejunum and ileum as usual. The duodenum started at the pylorus with a cranial portion, which dilated forming a duodenal ampulla. The ileum was located within the concavity of the caecum and attached to the coiled caecum by means of the iliocaecal fold. The ascending colon had two ansae, one proximal and one distal. The proximal ansa was fixed to the caecum by the caecocolic fold. The base of the caecum and a short proximal part of the ascending colon belonging to the proximal ansa were attached to the mesoduodenum descendens. The distal ansa of the ascending colon had a proximal part which was sacculated and a distal part which was smooth. The two parts of the distal ansa of the ascending colon were parallel and joined by a flexure of variable localisation. The smooth part of the distal ansa of the ascending colon was attached to the initial portion of the descending colon by a peritoneal fold. The short transverse colon was directly attached to the mesoduodenum and greater omentum. In conclusion, we have described the anatomy of the intestines of the nutria and its mesentery in detail, and provided a nomenclature list adapted to the Nomina Anatomica Veterinaria.
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Keywords

animal anatomy; Rodentia; digestive system; peritoneal folds

About this article
Title

Gross anatomy of the intestine and its mesentery in the nutria (Myocastor coypus)

Journal

Folia Morphologica

Issue

Vol 67, No 4 (2008)

Pages

286-291

Published online

2008-09-30

Bibliographic record

Folia Morphol 2008;67(4):286-291.

Keywords

animal anatomy
Rodentia
digestive system
peritoneal folds

Authors

W. Pérez
M. Lima
A. Bielli

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