Contraction times of the cat's tongue muscles measured by light reflection. Innervation of individual tongue muscles

Publisher Website
Google Scholar
Abstract
The contraction times of the cat''s tongue muscles were measured by recording the fine movements of their surfaces and movements of tongue''s surfaces. The recordings were made by a commercial, high-sensitive light reflection transducer (Fairchild FPLA 850) which could be operated without any mechanical loading of the tongue. The contraction times of the intrinsic muscles (including pars longitudinalis superior m. [musculus] hypoglossal and pars longitudinalis inferior m. styloglossi) measured about 22 ms, while the extrinsic muscles were somewhat slower, around 33 ms. The data are considered in the light of the recently reported histochemical composition of these muscles. The study of the hyoglossal nerve supply to individual tongue muscles revealed that the medial nerve sends branches to the intrinsic muscles not only at its distal end but during its entire course through the tongue. The transversal and vertical muscles receive numerous fibers innervating small units of their muscle fibers.