VIII.] 



THE MUSCLES. 



313 



the fronto-parietal or to the suspensorium, and It may, even 

 in Mammals, be inserted above into the mandible, as in 

 the Horse. 



The digastric of man is closely resembled only by the same 

 muscle in his own order. In other Mammals, e.g. the Dog, it 

 has but a single belly ; and in lower Vertebrates the muscle 

 which commonly receives this name has a very different 

 position. Thus in Birds and Reptiles it descends from the 



Tif CUfa C.lfi. J 



FIG. 284. 

 No. i. MUSCLES OF NECK AND SHOULDER OF Iguana, the trapezius and 



deltoid being cut short. 



B, biceps; 'BA, brachialis anticus ; CM, cerato-mandibular ; CM a, complexus 

 major; CMi, complexus minor; Z? 1 and D 2 , two parts of deltoid; DM, 

 digastric; EH, epicoraco-humeral, or sub-clavius ; JS, infra-spinatus ; LC, 

 levator claviculse ; OH, omo-hyoid ; P, pectoralis ; SCM, sterno-cleido- 

 mastoid ; SMg, serratus magnus; T l , external long head of triceps; T 3 , 

 external humeral head of triceps ; Tz, trapezius ; x, part of complexus. 



No. 2. DEEPER MUSCLES. 



CA, cervicalis ascendens ; CMa, complexus major; CMi, complexus minor; 

 DM, depressor mandibulae ; RAM, rectus capitis anticus major ; RPM, rectus 

 capitis posticus major ; Sc, scalenus ; SCAf, sterno-cleido-mastoid ; x, part of 

 complexus. 



hinder part of the cranium to the posterior end of the man- 

 dible, and in some Birds is divided into three portions. 



The stylo-hyoid of man is a muscle constant in his class, 

 but of variable size. It may be of extraordinary length, as in 

 the Great Ant-eater, and it may be, as in the Horse, re- 

 latively shorter than in man, the bony extent of the anterior 



