62 SURGICAL ANATOMY OF 



fibres are arranged into (1) the Hngualis superior, the 

 fibres of which are disposed obliquely and longitudinally 

 on the surface of the organ ; (2) an inferior longitudinal 



FIG. 12. 



Lingual artery and its branches. 1. Stylo-glossus. 2. Ranine artery. 3. Dor- 

 salis linguae artery. 4. Genio-hyoglossus muscle. 5. Middle constrictor. 6. 

 Genio-hyoid muscle. 7, 7. Hyoglossus (cut). 8. Sublingual gland. 9. External 

 carotid. 11. Lingual artery. 12. Hyoid branch. (HEATH.) 



set, passing from the hyoid bone to the apex, and in re- 

 lation on its under surface with the ranine artery ; its 

 fibres are blended with those of the stylo-glossus ; (3) 

 a transverse set, forming the bulk of the tongue, placed 

 between the superficial and longitudinal, are attached to 

 the fibrous septum, and curving outwards are inserted 

 into the dorsum linguae and its margin. The fibres in- 

 terlace with the before-named sets. The existence of the 

 fibrous septum explains how it is that in acute inflam- 

 mation of the tongue, or when abscess has formed, the 

 tumor is frequently unilateral. 



The extrinsic muscles are, the hyo-glossus, genio- 

 hyo-glossus, stylo-glossus, palato-glossus, and some few 

 fibres of the superior constrictor. 



Arteries. The lingual artery at the anterior edge of 



