1244 



A MANUAL OF ANATOMY 



The muscular tissue of the tongue is of the striped variety. 

 It forms two sets of muscles, namely, extrinsic and intrinsic. The 

 extrinsic muscles are those which have their origins outside the 

 tongue, and their insertions into it. They are as follows : (i) the 

 genio-hyo-glossus, (2) the hyo-glossus (including the chondro- 

 glossus), (3) the stylo-glossus, and (4) |:he palato-glossus, all of 

 which have been already described. I'he intrinsic mttscles are 

 those which are contained entirely within the tongue, and they 

 are arranged in pairs on either side of the median fibrous septum, 



Taste-bud 



Fig. 507.— Vertical Section of a Circumvallate Papilla of the Tongue. 



A, Circumvallate Papilla, beset with Secondary Papillae ; 

 B, Taste-bud; C, Gustatory Cell. 



which extends from the tip of the tongue as far back as the body 

 of the hyoid bone. The intrinsic muscles are as follows : (i) the 

 lingualis superficialis, (2) the lingualis inferior, (3) the lingualis 

 transversus, and (4) the lingualis verticalis. 



The lingualis superficialis is an expanded sheet placed on the 

 dorsum, immediately beneath the mucous membrane. Its fibres 

 are disposed longitudinally, and the muscle extends from the tip 

 backwards to the body of the hyoid bone. Posteriorly it is over- 

 lapped by fibres of the hyo-glossus. Its fibres do not extend over 

 the whole length of the tongue, but take attachment, at short 

 intervals, to the mucous membrane. 



