MYOLOGY 79 



fasciculi blend with those of the mylo-hyoideus; internally with the 

 larynx at the upper part. 



Action. To raise the trachea and hyoid apparatus against the 

 pharynx. 



THE MUSCLES OF THE TONGUE 



Mylo-hyoideus Stylo-hyoideus 



Genio-hyoideus Cerato-hyoideus 



Sterno-hyoideus Depressor-glossus 



Cerato-glossus Hyoideus transversus 



Mylo-hyoideus. Location. The forepart of the inter-ramal 

 space. * 



Origin. From the inner side of the lower jaw at a point just 

 above the lower border and the inturned edge of the horny sheath of 

 the beak. 



Insertion. By aponeurosis to the under side of the hyoid, on the 

 median line between the first and the second basi-branchial. 



Shape.- Thin, flat, and delicate. 



Relations. Inferiorly with the skin. Thin and rather broad, it 

 meets its fellow of the opposite side. Laterally with the rami 

 of the jaw. Superiorly with the hyoid apparatus. 



Action.' Lifts the tongue upward against the roof of the mouth. 



Stylo-hyoideus (Fig. 17, No. B, 6). Location. Supero-posterior 

 to the hyoid apparatus. 



Origin. From the outer portion of the articular enlargement of 

 the lower jaw. 



Insertion. By a tendon to the basi-branchial of the thyro-hyal. 



Shape. A long transversely flattened fasciculus. 



Relations. Supero-posterior part of the hyoid apparatus along 

 side the genio-hyoideus and the cerato-hyoideus. 



Action. Singly, pulls the tongue to one side; acting with its 

 fellow, pulls the tongue upward. 



Genio-hyoideus (Fig. 9, No. 7). Location. Supero-posterior to 

 the hyoid apparatus. 



Origin. From the anterior portion of the inner side of the lower 

 jaw. 



Insertion. To the middle of the outer side of the basi-branchial 

 of the corner of the os hyoides which cornu it completely envelops. 



Shape.- A long, rather thick fasciculus. 



Relations. With the stylo-hyoideus and cerato-hyoideus. 



