Abstract：
The larynx is in the lower respiratory tract and has the function of protecting the airways, controlling, and modulating breathing, assisting the circulatory system, and vocalizing. This study aims to describe the anatomy and histology of the skeleton of the larynx and trachea of the species Chelonia mydas, Caiman yacare and Caiman latirostris. The study was conducted at the Federal University of Espírito Santo (UFES), using nine specimens of Ch. mydas, 20 of Ca. yacare and four of Ca. latirostris. Samples of the larynx and trachea were collected, fixed, and sent for dissection of the structures and subsequent macroscopic analysis. For histology, samples were processed by the routine paraffin embedding method and stained with hematoxylin-eosin and Verhoeff. For the three species, two arytenoid cartilages, a cricoid cartilage, a hyoid apparatus composed of a base and two horns were found. In Ch. mydas, two structures called thyroid wings were observed, not found in crocodilians. The trachea of crocodilians presented incomplete tracheal rings and musculature, while the trachea of Ch. mydas presented complete tracheal rings. Histologically, the entire cartilaginous skeleton of the larynx of the three species, as well as the tracheal rings, are constituted by hyaline cartilage.
摘要：
喉位于下呼吸道，具有保护气道的功能，控制,调节呼吸，协助循环系统，和发声。这项研究旨在描述Cheloniamydas物种的喉和气管骨骼的解剖结构和组织学，凯曼·亚卡雷和凯曼·拉蒂罗斯里斯。这项研究是在圣埃斯皮里图联邦大学（UFES）进行的，使用九个Ch标本。mydas,20Cayacare和四个Ca。latirostris.收集喉和气管的样本，固定,并送去解剖结构和随后的宏观分析。对于组织学，样品通过常规石蜡包埋方法处理，并用苏木精-伊红和Verhoeff染色。对于这三个物种来说，两个软骨软骨，环状软骨，发现了一个由基部和两个角组成的舌骨装置。在Ch.mydas,观察到两个叫做甲状腺翼的结构，在鳄鱼身上没有发现。鳄鱼的气管表现出不完整的气管环和肌肉组织，而Ch的气管。mydas展示了完整的气管环。组织学上,这三个物种的喉的整个软骨骨骼，以及气管环，由透明软骨构成。
