Angioarchitectural form, functional distributive pattern and classification of the filiform papillae on the crossbred Japanese cat tongue anterodorsal surface in scanning electron microscopic specimens

The purpose of this study was to undertake a three-dimensional comparative observation of the angioarchitectural form, functional distributive pattern and classification of the filiform papillae (FiP) as they appear on the en tire dorsal surface of the front of the Japanese cat tongue using microvasc ular cast specimens (MVCS). By means of the corrosive resin casting techniq ue, the MVSC of the FiP of the cat tongue were prepared and examined in det ail under the scanning electron microscope (SEM). On the frontal half of the anterodorsal surface of the anterior tongue, typ es I-V of the FiP are arranged in the form of a Lambda with the point in th e direction of the apex and in an oblique line running from the antero-cent ral to both postero-peripheral regions. In the rear half of the anterodorsa l surface of the anterior part of the tongue, types I-V of the FiP are arra nged in the form of a V with the point in the direction of the root and in an oblique line running from both antero-peripheral regions to the postero- median region or towards the pharynx on the anterior centro-dorsal surface of the tongue. The FiP, arranged in an oblique line running fron the central to the apical part of both the periphery and the pharyngeal region of the cat tongue, ca n be classified into five types (Types I-V) according to the shape and size of the main process (MP), numbers of the accessory processes (AP) and regi onal position of the lozenge arrangement. FiP Types I-III consisted of an M P which contained a large spoon-shaped and concave network process and the AP contained a bundle of spin-like processes arranged radially at the anter ior basal margin of the MP. FiP Types IV and V consisted only of MP. It was conjectured that the lozenge arrangement of the Lambda and V form Fi Ps, classified into five types (Types I-V) from the frontal portion of the anterodorsal surface toward the pharynx on the front of the tongue, play a functionally assistant role in the mastication of food and sucking of liqui d, including milk.