by charles w. de vis, b.a. 303 



Muscles of the upper surface of the head. 



Digastric (fig. 2-d.) — In two very distinct and subequal bodies. 

 The external from the edge and posterior sloping surface of the 

 postfrontal : — passing the fibro-cartilaginous root of Grey's cartilage 

 of the hood its outer fibres have a strong insertion into the hinder 

 part of the root of the cartilage; it is thence continued to form the 

 posterior portion of its joint insertion into the extremity of the 

 inner surface of the long articular process of the mandible. By 

 virtue of its insertion into the cartilage it becomes the chief erector 

 of the upper half of the hood. The internal body rises from the 

 parietal process, and converging to the external near their joint 

 insertion forms the posterior half of that insertion. 



Attolleas chlamydia (fig. 2 — ate). — A thin triangular muscle 

 rising from the posterior half of the edge of the postfrontal 

 external to the digastric and inserted into the fore part of the 

 lower angle of Grey's cartilage. 



Adductor chlamydia (fig. 2 — a. a). — A very distinct band rising 

 over the occipital condyle from the ligamenturn nuchse and fascia 

 of the complexus major in apposition to its fellow of the opposite 

 side ; running outward and downward within a conspicuous fold 

 of the integument of the hood it reaches Grey's cartilage, and is 

 inserted into it at about the middle of its lower side. Its function 

 seems to be to draw the erect hood downward and inward upon 

 the neck. 



Pterygoideus externus. — From the sloping posterior external 

 surface, rotular anterior edge and adjacent inner surface of the 

 articular process ; — inserted mainly by strong tendon into the 

 entopterygoid process, also into the edge of the entopterygoid as 

 far as its exterior process. 



Pterygoideus iaternus. — From the posterointernal surface of 

 the articular process nearly to the coronoid process ; — inserted into 

 the edge and surface of the entopterygoid. 



Temporalis (fig. 2 t.) — From the whole fossa — i.e., from the 

 outer side of the tympanic, columella, and parietal process ; 

 inserted into the coronoid process and edge of the surangular 

 element. 



