Department of Companion Animal Clinical Studies, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.
Department of Anatomy and Physiology, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.
Anat Rec (Hoboken). 2019 Oct;302(10):1855-1864. doi: 10.1002/ar.24132. Epub 2019 Apr 24.
Less than 7,000 cheetahs survive in the wild. Captive breeding has proved notoriously difficult. The uterotubal junction acts as major barrier and regulator to the passage of sperm. This study describes the morphology of the uterotubal junction of the cheetah. Reproductive tracts were obtained from seven cheetahs that succumbed from natural causes or were euthanized for humane reasons. The uterotubal junction was isolated and examined macroscopically and microscopically. The extramural isthmus made a characteristic 90° bend before entering the mesometrial border of the uterus close to its tip. The intramural isthmus had approximately four primary folds lined by nonciliated cuboidal to low cuboidal epithelium. The Tunica muscularis was robust, merged with its uterine counterparts and consisted of an inner circular layer and outer longitudinal smooth muscle layer. The uterine ostium opened via a muscular and glandular papilla that projected from the apex of the uterine lumen. A sharply demarcated circular zone of simple columnar epithelial cells surrounded the uterine ostium and separated the simple cuboidal to low cuboidal cells of the isthmus and uterine epithelium from each other. Branched tubulo-alveolar glands, some with dilated lumens, were present in the papilla and sometimes extended into the adjacent endometrium. These glands might act as sperm storage areas, and could easily be confused with cystic endometrial hyperplasia. Low transverse endometrial ridges surrounded the papilla and extended caudally for a short distance before disappearing. The uterine glands were lined by a simple cuboidal epithelium. Anat Rec, 302:1855-1864, 2019. © 2019 American Association for Anatomy.
野生环境中现存的猎豹不足 7000 只。圈养繁殖一直以来都困难重重。输卵管子宫连接部是精子通过的主要障碍和调节部位。本研究描述了猎豹输卵管子宫连接部的形态。从因自然原因死亡或出于人道原因被安乐死的 7 只猎豹中获得生殖道。将输卵管子宫连接部分离并进行宏观和微观检查。在进入靠近子宫尖端的子宫系膜边界之前，管外峡部形成了一个特征性的 90°弯曲。管内峡部有约 4 个初级褶皱，由无纤毛的立方至低立方上皮排列。黏膜肌层很发达，与子宫对应部分融合，由内层环形层和外层纵向平滑肌层组成。子宫口通过从子宫腔顶端突出的肌肉和腺状乳突打开。一个明显分界的圆形单层柱状上皮细胞区环绕着子宫口，将峡部和子宫上皮的单层立方至低立方细胞彼此分开。分支的管状-腺泡状腺体，有些具有扩张的腔，存在于乳突中，有时延伸到相邻的子宫内膜中。这些腺体可能充当精子储存区，并且很容易与囊性子宫内膜增生相混淆。低横向子宫内膜嵴围绕着乳突，并在尾部延伸一小段距离后消失。子宫腺体由单层立方上皮衬里。解剖学记录，302:1855-1864，2019。©2019 美国解剖学会。
