COMPARATIVE ANATOMY OF THE MUSCULAR SYSTEM 



143 



k] Thyrohyoid. Short narrow muscle on each side of the thyroid cartilage 

 from which it takes its origin; insertion, posterior horn of the hyoid; action, 

 raises the larynx. 



The majority of the muscles mentioned in this section are the visceral 

 muscles. They correspond to the muscles found in the dogfish associated with the 



branch of facial nerve 

 parotid duct 

 masseter 



digastric 



mylohyoid 

 submaxillary gland 



stemohyoid 



sternomastoid 



cleidomastoid 

 basioclavicularis 



cephalohumeral 

 first deltoid 



lateral head of the triceps 

 long head of the triceps 



pectoralis major 

 serratus ventralis 



, parotid gland 



rhomboideus capitis 



splenius 



external jugular vein 

 levator scapulae ventralis 



pectoralis minor 

 anterior trapezius 



second deltoid 



posterior trapezius 



latissimus dorsi 



external oblique 



FIG. 42. Lateral view of the anterior part of the rabbit to show the muscles. The head is turned 

 slightly to give a ventral view of the throat. All dermal muscles have been removed. 



gill arches. They are the muscles of the jaws, the hyoid, and the cartilages of the 

 larynx, all of which structures are, as learned in the study of the skull, homolo- 

 gous with the gill arches of fishes. The masseter, the temporal, the mylohyoid, 

 and part of the digastric are muscles of the mandibular arch; the platysma and 

 the rest of the digastric are muscles of the hyoid arch ; while the muscles of the 

 remaining arches become muscles of the pharynx and larynx, which were not 

 studied. 



