498 



HUMAN ANATOMY. 



Variations. — A considerable amount of independence may exist between the bundles of 

 nbres coming from different portions of the line of origin, and the muscle has consequently been 

 described as consisting of various portions to which the terms pterygo-pharyftgeus, bucco- 

 pharyugeus, mylo-pharyngeus, and glosso-pharyngeiis have been applied. 



Not infrequently a bundle of fibres is to be found arising from the basilar portion of the 

 occipital bone or even from the inferior surface of the petrous portion of the te'mporal or the spine 

 of the sphenoid, and passing downward to be inserted along with the pharyngo-palatinus. A 

 bundle which passes from the cartilaginous portion of the Eustachian tube to be inserted with 

 the palato-pharyngeus has been termed the salpingo-pharyngeus. 



Internal carotid artery 

 Internal jugular vein I 



Fig. 510. 



Condyles 



Central attachment of pharynx 



Stylo- 

 pharyngeus 



Middle 

 constrictor 



Mastoid— i 

 process 



Internal 

 pterygoid 



Styloid process 



Digastric, 



posterior belly 



Stylo- 



pharyngeus 



Stylo-glossus 



Stylo-hyoid 



Stylo-hyoid 

 ligament 



Tip of great cornu of 

 hyoid bone 



Thyro-hyoid ligament 

 Superior cornu of thyroid 

 cartilage 



Inferior constrictor 



Longitudinal muscle of oesophagus 



Muscles of pharynx from behind ; portion of inferior constrictor has been removed. 



7. Constrictor Pharyngis Medius (Fig. 510). 



Attachments.— The middle constrictor of the pharynx is a fan-shaped sheet 

 which arises from, the stylo-hyoid ligament and both cornua of the hyoid bone. The 

 fibres pass backward to be inserted into the pharyngeal raphe, the upper fibres 



