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An examination of the sensory structures in the oral cavity of the American alligator (Alligator mississippiensis).

Authors :
Rehorek SJ
Duffy M
Zacherl JR
Anand K
Elsey RM
Smith TS
Source :
Journal of morphology [J Morphol] 2014 Nov; Vol. 275 (11), pp. 1312-20. Date of Electronic Publication: 2014 Jun 27.
Publication Year :
2014

Abstract

The location and distribution of mucosal sensory structures of the crocodilian oral cavity are poorly understood. Although there are several descriptions of these structures in adults, nothing is known about their development. The purpose of this study was to document location, morphology, and relative abundance of these mucosal sensory structures in both hatchling and subadult alligators. Numerous mucosal sensory structures and pale staining dome-shaped papillae were observed only in the upper palate and tongue. In hatchlings, these papillae, which house either mechanoreceptive or chemosensory (taste buds) structures, were larger and more prevalent on the tongue than the upper palate. In the subadult, however, these papillae housed primarily mechanoreceptive structures and possibly degenerate taste buds. Although the presence of the mechanoreceptive structures in the palates of the suabadult alligator are to be expected, the loss of most taste buds is hitherto undocumented. Thus, there is morphological support for an ontogenetic shift in the role of the sensory palate, from a prey detection gustatory sensory system in hatchlings to a prey-manipulative mechanoreceptive system in subadults.<br /> (© 2014 Wiley Periodicals, Inc.)

Details

Language :
English
ISSN :
1097-4687
Volume :
275
Issue :
11
Database :
MEDLINE
Journal :
Journal of morphology
Publication Type :
Academic Journal
Accession number :
24976263
Full Text :
https://doi.org/10.1002/jmor.20306