[Anatomy of the female reproductive system of the Alouatta belzebul (Linnaeus, 1766)]

ABSTRACT Knowledge of the anatomy of any wild animal is of fundamental importance for its preservation and protection. In this context the present study aimed to describe the morphology of the female reproductive system of A. belzebul. We used 6 specimens of A. belzebul, female, adult and free of lesions. It was macroscopically observed that the ovaries are ovoid with smooth surface and the histological analysis in cortical region showed ovarian follicles in different stages of development. The fallopian tubes are anatomically thin and curvilinear, with one mucous layer, one muscular and one serous layer. The uterus was presented in a simple format with a globular fundus, with a highly vascularized myometrium, being organized in bundles of smooth muscle fibers. The anatomical structure of the vagina presented itself as a long thin-walled muscular tube where in the vestibular region the external orifice of the urethra is marked by a bilobed urethral papilla and in the caudal portion in its caudal portion a well-developed clitoris. Regarding the histological analysis of the vagina, a basal extract composed of atrophic non-keratinized stratified squamous epithelium was found in the vaginal mucosa region. The morphological descriptions provide important information regarding the macroscopic and microscopic anatomy of the female reproductive system of this species in an unprecedented way.

摘要 任何野生动物的解剖学知识，均为其物种保育与保护的核心基础。本研究旨在记述A. belzebul雌性生殖系统的形态学特征。本次研究共使用6只成年、无病变的雌性A. belzebul标本。
大体观察结果显示，其卵巢呈卵圆形，表面光滑；对卵巢皮质区开展的组织学分析可见不同发育阶段的卵泡。输卵管纤细且呈弯曲状，由黏膜层、肌层与浆膜层三层结构构成。
子宫结构简单，宫底呈球形，子宫肌层血管丰富，由平滑肌纤维束有序排列组成。
阴道的解剖结构为细长薄壁的肌性管道：在前庭区域，尿道外口以双叶状尿道乳头为标志；在阴道尾部则具有发育良好的阴蒂。针对阴道的组织学分析显示，阴道黏膜区域可见由萎缩性非角化复层鳞状上皮构成的基底层。
本研究首次以前所未有的详细程度，记述了该物种雌性生殖系统的宏观与微观解剖学特征，可为相关研究提供重要参考信息。