The laryngeal cartilages of ambystoma

✍ Scribed by Hilton, William A.

• Publisher: John Wiley and Sons
• Year: 1911
• Tongue: English
• Weight: 237 KB
• Volume: 5
• Category: Article
• ISSN: 0003-276X
• DOI: 10.1002/ar.1090051204

✦ Synopsis

Probably the greatest interest in a consideration of the laryngeal region in Amphibia is in connection with the general homology and development of the respiratory cartilages of Vertebrates. Wilder and Gegenbaur in 1892,' independently of each other, made the suggestion that the cartilages of the larynx and trachea, as a whole or in part, were homologous with the fifth brachial arch. This was first suggested to Wilder by the fact that every form possesses either a pair of laryngeal cartilages, or a pairof fifth brachial arches, but no animal possesses both. It was first suggested to Gegenbaur by the musculature of the larynx which was found to be essentially branchial. DriineP, who worked on the anatomy of this region in a number of Urodela, held much the same view, Henle, in 183g3, first recognized two cartilages, one on either side of the larynx which he called 'lateral cartilages,' and he considered them to be primitive and to represent those of the larynx and trachea. Wilder was of the opinion that these cartilages about the upper larynx corresponded to the fifth arch, the 'lateral cartilages' representing the artenoids of higher forms, while he considered the other tracheal elements to be a new formation arising directly from connective tissue. Upon further investig a t i ~n , ~ Wilder abandoned his idea of an independent origin of the tracheal elements and reverted to that of Henle as accepted by Gegenbaur. Driiner is more inclined to Wilder's first view.

Wilder, H. H.: Studies on the phylogenesis of the larynx. Anat. Anz.,