18h5.] MYOLOGY OF THE WATER-Ol'OSSU M. 7 



The anterior few fibres are inserted into base of spine, the rest by a 

 broad muscular mass into base of scapula, beiug embraced in 

 posterior half by serratus magnus. 



Acromio-trachelien (omo-atlautic). — Arises by a flat tendon from 

 anterior arch of atlas, and by a small accessory slip from basioccipital. 

 The greater part of the muscle is inserted into dorsal third of spine 

 of scapula, whilst a thin slip, leavuig muscle in its lower third, 

 crosses insertion of omohyoid, and is inserted into base of scapula in 

 close connection with inner portion of serratus magnus. 



Vleido-occipital. — Arises near middle of clavicle by muscular fibres, 

 and is inserted into occipital crest internal to cleido-mastoid, its 

 posterior fibres being continuous with trapezius for half an inch, 

 lis anterior fibres are just united with cleido-mastoid at their 

 insertion. 



Cleido-mastoid. — Overlain by sterno- mastoid except just at its 

 origin. Arises from front of clavicle at its sternal end by fleshy 

 fibres. It forms a broad, flat muscle, inserted by a rounded mass 

 into occiput between sterno-mastoid and digastric, and by coarse 

 fasciculi into occi|)ital crest for its outer half. 



Sterno-mastoid. — Arises from front of manubrium sterni by 

 tendinous and fleshy fibres, close to its fellow of opposite side. It 

 forms a broad fleshy belly, inserted by a tendon into front of mastoid 

 process just behind external auditory meatus. It is continuous just 

 at its insertion with cleido-mastoid. 



Trapezius. — This nmscle was much damaged. It apparently 

 arises from occipital protuberance, its anterior fibres being con- 

 tinuous with posterior fibres of cleido-occipital, from spines of 

 cervical and dorsal vertebrae. Its anterior and middle fibres are 

 inserted into whole length of spine of scapula, whilst its posterior ones 

 pass forwards to be inserted into the spine at its dorsal part. 



Latissimus dorsi. — Arises from spinous processes of dorsal vertebrae, 

 and from lumbar fascia which attaches it to lumbar vertebrie and 

 crest of ilium. Inserted by narrow tendon into inner lip of bicipital 

 groove of humerus. 



Dorsi epitrochlear. — A thin muscular slip arising from outer 

 surface of latissimus dorsi by tendinous fibres, and inserted into 

 fascia on inner side of arm which attaches it to olecranon. 



Serratus magnus. — Arises by thirteen digitations from posterior 

 six cervical transverse processes, closely connected with insertion of 

 scalenus, and from outer surface of first seven ribs. The anterior 

 fibres are inserted into inner lip of base of scapula, whilst the 

 posterior digitations curve round to outer lip of base, embracing 

 insertion of rhomboideus. 



Subclavius. — Arises from cartilage of first rib and is inserted into 

 posterior border of clavicle at its outer half, a few of its inner fibres 

 being continuous with the following portion, which arises by 

 muscular fibres from the posterior border of clavicle at its outer two 

 thirds, and is inserted by thin tendinous fibres into anterior border 

 of acromion. 



Pectoralis major.— Consists of two portions : — o, a large triangular 



