QUESTIONS AND ANSWERS 57 



metatarsal bone. It blends, outwardly, with the external and super- 

 ficial, tibiotarsal ligament, and inwardly, with the posterior tarso- 

 metatarsal band. Strains of this ligament give rise to "curb." 



Myology 

 Describe aponeuroses. 



Aponeuroses are flattened bands of white fibrous tissue which 

 envelop, in common, all the muscles of one or several adjoining re- 

 gions, and by one extremity are attached to the bones. They main- 

 tain the muscles in their position and sustain them during their 

 contraction. 



Describe the masseter muscle. 



A short, wide and very thick muscle, irregularly quadrilateral, 

 applied against the external face of the mandible. Origin: the 

 zygomatic process of the temporal bone. Insertion : the outer sur- 

 face of the ramus of the jaw. Action : elevator of the jaw. Nerve : 

 inferior maxillary branch of the fifth. 



Name the muscles that close the jaw and give the attachments of each, 



Masseter, see above. Temporal, from the temporal fossa, the 

 temporal fascia and the outer border of the orbit to the coronoid 

 process and ramus of the inferior maxilla ; pterygoid internus, from 

 the palatine crest and subsphenoidal process to the hollow on the 

 inner face of the inferior maxilla; pterygoid externus, from the 

 inferior face of the sphenoid and the pterygoid process to the neck 

 of the condyle of the lower maxilla. 



Name the muscles of the globe of the eye. 



Retractor oculi; superior, inferior, external and internal recti; 

 superior oblique and inferior oblique. 



Describe the mastoidohumeralis muscle. 



It extends from the summit of the head to the inferior part of the 

 arm. It consists of two portions, viz., an anterior portion which 

 originates on the mastoid process and crest, and is inserted in the 

 furrow of torsion of the humerus, below the deltoid imprint; a 

 posterior portion which originates on the transverse processes of the 

 first four cervical vertebrse and is inserted with the anterior portion. 

 It carries the limb forward or inclines the head to the side. 



Name the muscle separating the carotid artery from the jugular vein. 

 What is the function of this muscle? 

 The subscapulohyoideus. It is a depressor of the hyoid bone 

 and its appendages. 



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