THE TONGUE 



351 



the details, carefully, reflect the mucous membrane from the 

 right half of the tongue, and follow the muscles into that side 

 of the organ. At the same time the lingual nerve and the 

 profunda linguae artery should be preserved. On the under 

 surface of the tongue, near the tip, the removal of the mucous 

 membrane will expose a group of glands, aggregated together 

 so as to form a small oval mass on each side of the median plane. 

 The mass of glands is known as the apical gland or the gland of 

 Nuhn. 



The stylo-glossus will be seen running along the side of 

 the tongue to the tip, where the muscles of opposite sides 

 become, to a certain extent, continuous. The hyo-glossus 

 extends upwards to the side of the tongue, and its fibres pass, 

 for the most part, under cover of those of the stylo-glossus to 

 reach the dorsum, over the posterior part of which they spread 

 out, beneath the mucous membrane. The genio-glossus sends 



M. longitudinalis 

 superior 



Lamellae of 

 M. transversus 



M. genio-glossu 



M. genio-hyoideus PW * 



\ l^- 

 Hyoid bone 



FIG. 133. Longitudinal section through the Tongue. (FromAeby.) 



its fibres upwards into the tongue on each side of the 

 median septum, and its insertion stretches from the tip to the 

 base. The fibres of the glosso-palatinus become continuous 

 with the intrinsic transverse fibres. 



The chondro-glossus is not always present. It is separated from the 

 deep surface of the hyo-glossus by the lingual vessels. It is a slender 

 muscular band which takes origin from the medial aspect of the root of 

 the lesser cornu, and the adjoining part of the body of the hyoid bone. 

 Its fibres ascend, to enter the tongue, where they finally spread out on the 

 dorsum, under cover of the superior longitudinal muscle. 



Musculus Longitudinalis Superior. The superior longitudi- 

 nal muscle lies immediately beneath the mucous membrane, 

 and is a continuous layer of longitudinal fibres which covers 

 the entire dorsum of the tongue, from the root to the tip. 

 Towards the base of the tongue it is thinner than in front, 

 and there it is overlapped by the transverse fibres of the hyo- 



