330 _MESSRS. MURIE AND MIVART ON THE [Apr. 11, 
Muscles of the Head and Neck. 
Masseter.—From the very great size of the ascending ramus of 
the mandible, this muscle presents a very broad surface, and it an- 
swers the description given by Cuvier * and Meckel f. 
The external pterygoid arises from the pterygoid fossa at its outer 
and anterior margin, and is inserted into the neck of the mandible 
(fig. 1, #. p.). ut 
The internal pterygoid has origin by a strong tendon from the 
hook-like process at the lower extremity of the outer margin of the 
pterygoid fossa, and from the posterior and inner margin of that 
fossa. It spreads out in a fan-shaped manner, and is inserted into 
the concavity of the mandible behind the mylo-hyoid foramen, be- 
tween the digastric and the bone (figs. 1 & 2, I. p.). The external 
and internal pterygoid we found to be completely and distinctly se- 
parate, and by no means confounded together as Cuvier states f. 
We particularly mention the distinctness of these two muscles, in 
order to demonstrate more clearly the true nature of the digastric. 
Fig. 1. Ramus of the lower jaw. A portion of the bone is removed, to show the 
pterygoid muscles. £. p. External pterygoid. J. p. Internal pterygoid. 
Fig. 2. Right half of inferior maxilla, séen from below. D. Digastric. J. p. 
Fibres of insertion of the internal pterygoid into the angle of the man- 
dible. 
The stylo-hyoid arises from the paramastoid process, behind the 
* Anat. Comp. tome iv. part 1, p. 69. 
t Anat. Comp. tome viii. p. 476. 
$ Anat. Comp. vol. iv. part 1, p. 91. 
