Scanning Electron Microscopic Study on the Tongue and Lingual Papillae of the adult Spotted Seal, Phoca largha

• Published in: Okajimas Folia Anatomica Japonica Vol. 84; no. 3; pp. 83 - 98
• Main Authors: YOSHIMURA, Ken, SHINDO, Junji, MIYAWAKI, Yoshiko, KOBAYASHI, Kan, KAGEYAMA, Ikuo
• Format: Journal Article
• Language: English
• Published: Japan Editorial Board of Okajimas Folia Anatomica Japonica 2007
• Subjects: Age Factors; Animals; Connective Tissue - physiology; Connective Tissue - ultrastructure; Epithelium - physiology; Epithelium - ultrastructure; Feeding Behavior - physiology; Female; Lingual Papillae; Mastication - physiology; Microscopy, Electron, Scanning; Phoca; Phoca - anatomy & histology; Phoca - physiology; Scanning Electron Microscope (SEM); Species Specificity; Spotted Seal; Taste - physiology; Taste Buds - physiology; Taste Buds - ultrastructure; Tongue - physiology; Tongue - ultrastructure
• ISSN: 0030-154X; 1881-1736
• DOI: 10.2535/ofaj.84.83

We observed the external surface and connective tissue cores (CTCs) of the lingual papillae (filiform, fungiform and vallate papillae) of adult Spotted seals (Phoca largha) using SEM and light microscopy. The tongue was Vshaped and its apex was rather rounded. On the dorsal surface from apex to the one-third posterior of the tongue, the lingual mucosa was densely covered by filiform papillae, with a scatted distribution of dome-like fungiform papillae, which have orthokeratinized epithelium. At the posterior part of the tongue, filiform papillae were totally diminished and their epithelium was parakeratinized. Approximately 6-7 vallate papillae were arranged in a V-shape on the posterior of the tongue. After removal of the epithelium, the CTCs of the filiform papillae that were distributed at apex consisted of a primary core and approximately 5-6 rod-shaped small accessory cores. The CTCs of filiform papillae that were distributed at anterior part of the tongue lacked primary protrusions and possessed approximately 10-15 rod shaped small accessory cores that were arranged in a horseshoe manner. The CTCs of fungiform papillae had cylindrical primary cores and were fringed with accessory protrusion. In the Vallate papillae, taste buds were only seen at the dorsal epithelium.