HEAD AND NECK OF THE HORSE 



83 



The muscles of the tongue (musculi lingn?e). — The muscular tissue 

 of the tongue is generally divided into that which belongs to the 

 extrinsic muscles and that which is intrinsic to the tongue itself. The 

 extrinsic muscles— stylo-glossal, hyo-glossal, genio-glossal and chondro- 

 glossal— were examined at earlier stages in the dissection. The 

 intrinsic muscular fibres are longitudinal, transverse and vertical in 

 direction. 



In the horse a very inconspicuous layer of loose connective tissue in 



M. pterygopharyngeus. 

 M. palatopharyngeus.. \ 

 M. stylopharyngeus. \ ^ 



A. palatina ascendens. \ 



N. lingualis. 



M. styloglossus. 



M. chondropharyngeus 

 N. laryngeus cranialis. 

 M. thyreopharyngeus. \ 



M. cricopharyngeus. 

 A. pharyngeus \ 

 ascendens. \ 

 A. thyreoidea 

 cranialis. \ 

 Thyroid gland, s ^ 



N. recurrens. 



M. sternothyreoideus. 



M. cricothyreoideus. / , 

 Mm. sternohyoideus / 

 et omohyoideus. 

 M. thyreohyoideus. 

 N. glossopharyngeus, 



j Submaxillary duct. 

 M. hyoglossus. 

 N. hypoglossus. 



A. lingualis. 

 Fig. 28. — Lateral aspect of the ijharynx, larynx and tongue. 



the median plane, and separating the muscles of the two halves of the 

 organ, is all that represents the lingual septum ^ (septum linguas). 



Arteries and nerves of the tongue. — The lingual artery has been 

 traced into the tongue previously (page 64), and all that now remains 

 to be done is to determine the ending of its smaller twigs in the mucous 

 membrane, &c. The lingual ramus of the glosso-pharyngeal nerve 

 supplies the mucous membrane of the posterior part of the tongue, and 

 branches of the hypoglossal nerve should be found entering the various 

 muscles. 



^ Septum or smptum [L.], a partition. 



