Rezende Lorenna Cardoso, Ferreira Jussara Rocha
Research Laboratory of Macro and Mesoscopy, Faculty of Medicine, Darcy Ribeiro Campus, Asa Norte, University of Brasília, Brasília, DF 70910-900, Brazil.
Zoolog Sci. 2013 Jan;30(1):60-4. doi: 10.2108/zsj.30.60.
The literature supports the hypothesis that the pelvic excavation is the bottom of the abdominal cavity, which is covered by the peritoneal serous membrane in order to promote visceral dynamics. We studied the peritoneum in eight specimens of Xenarthra (Euphractus sexcinctus, Myrmecophaga tridactyla and Tamandua tetradactyla). The animals were fixed in formaldehyde (10%). For description and analyzes of the pelvic peritoneum, dissection and photo documentation were performed. We saw that the parietal serous membrane reflected, involving the pelvic viscera. The urorectal septum is the floor of the higher pelvis as a serosa reflection between the bladder and the rectum. The bladder and gonads are completely peritonized in adult armadillo. In anteaters and young armadillos, the testicles are in a position analogous to the uterus, joined by the conjunctive septum at the midline and along with the bladder, they partially project to the higher and lower pelvis. In Myrmecophagidae, vesicogenital, rectogenital and sacrorectal recesses were observed. In Dasypodidae, the recesses are similar to those of other recent vertebrates.
文献支持骨盆凹陷是腹腔底部的假说，其被腹膜浆膜覆盖以促进内脏活动。我们研究了贫齿总目动物的八个标本（六带犰狳、大食蚁兽和小食蚁兽）的腹膜。这些动物用10%的甲醛固定。为了描述和分析骨盆腹膜，进行了解剖和照片记录。我们观察到壁层浆膜折返，覆盖了盆腔脏器。尿直肠隔是较高骨盆的底部，为膀胱和直肠之间的浆膜折返。成年犰狳的膀胱和性腺完全被腹膜覆盖。在食蚁兽和幼年犰狳中，睾丸处于类似于子宫的位置，在中线处由结缔组织隔膜相连，并且与膀胱一起，部分突入较高和较低的骨盆。在食蚁兽科中，观察到膀胱生殖、直肠生殖和骶直肠隐窝。在犰狳科中，这些隐窝与其他近代脊椎动物的相似。
