100 MUSCULAR SYSTEiM. 



sumed in the substance of that organ. They receive the inaeitions 

 of all the other glossal muscles. 



Action. — To contract the tongue lengthwise, and to draw it 

 withni the mouth. 



8.— PHARYNGEAL REGION. 

 HYO-PHARYNGEUS. — Keiato-phai'ytigeus. 



Situation. — Infero-lateral and posterior part of the pharynx. 



Form. — Flat, thin, quadrilateral. 



Attachment. — Infero-posteriorly, to the superior border of the 

 cornu of the os hyoides ; supero-anteriorly, to the side of the 

 pharynx. 



Relations. — Externally, with the pterygoideus internus ; inter- 

 nally, with the larynx. 



Action. — To dilate the bag to receive the food. 



p A L A To-p H A R Y N G E US. — Pteiygo-phatyngeus. 



Situation. — Upon the side of the pharynx. 



Form. — Broad and thin : irregular in figure. 



Attachment. — Superiorly, to the pterygoid process of the 

 sphenoid, and to the palate bone : inferiorly, to the pharynx — its 

 fibres intermixing and confounding themselves with those of the 

 hyo-pharyngeus and stylo-pharyngeus. 



Direction. — The reverse of the former muscle : viz. from above, 

 downwards ; and from before, backwards. 



Action. — To assist in the dilatation of the pharynx. 



STYLO-PHARYNGEUS. 



Situation. — Postero-lateral part of the pharynx. 



Attachment. — Posteriorly, to the styloid process of the tem- 

 poral bone, and outer side of the cartilage of the Eustachian 

 tube : anteriorly, to the side of the pharynx. 



Structure. — Tendinous at its origin : remainder, fleshy. 



Action. — To assist in dilatation, by drawing the side of the 

 bag in a direction upwards and backwards. 



CONSTRICTOR PHARYNGis ANTERIOR. — Hyo-pharyngeus. 

 Situation. — Antero-superior part of the pharynx. 

 Attachment. — Inferiorly, antero-internal part of the cornu of 

 the OS hyoides ; superiorly, to a tendinous line uniting it with its 

 fellow along the mesio-anterior part of the pharynx. 



CONSTRICTOR PHARYNGIS MEDius. — Thi/ro-phari/ngcus. 



Situation. — Behind the former muscle. 



Attachment. — Inferiorly, lateral parts of the thyroid cartilage : 



