36 



CLAVICLE. 



The anterior face is a concavity called cost.a or venter, divided by 

 ridges, and giving origin to the subscapular muscle. The posterior 

 face is the dorsum, divided by the spine into two fossse ,• the fossa 

 supra-spinata, containing the supra-spinatus muscle, and the fossa 

 infra-spinata for the infra-spinatus muscle. 



The spine is a rough ridge running obliquely across the dorsum, 

 and terminating in the acromion process, which is flat and triangular, 

 has a small articular mark in front for the clavicle. The edge of 

 the spine gives origin to the deltoid, and insertion to the trapezius 

 muscles ; near the base of the scapula the spine has a small triangular 

 surface/* over which plays the trapezius tendon. 



Internal edge or base. — Is the longest, and nearly parallel^ with the 

 vertebral column, has an external lip for the insertion of the rhom- 

 boid muscles, and an internal one for the serratus anticus. 



External edge. — Is thick,^ and contains a fossa giving origin to 

 the teres minor muscle. At the upper part of this fossa is the 

 origin^ of the long head of the triceps. 



Superior edge. — Is thin and small,^ has a notch called coracoid,* 



which is converted into a foramen 



Fig. 20. 



by a ligament, and transmits the 



supra-scapular artery and nerve. 

 Near this notch arises the omo- 

 hyoid muscle. 



Superior angle. — Almost a right 

 angle, and has the levator anguli 

 muscle inserted into it. 



Inferior angle. — Most pointed,^ 

 and gives origin by its posterior 

 surface to the teres major muscle 

 and is connected with the latissimus 

 dorsi. 



External angle. — Presents a 

 large articular cavity^ called 

 glenoid upon a narrow neck. This 

 cavity is oval and shallow, and at 

 its summit is a mark showing the 

 origin of the long head of the 

 biceps muscle. 



Cor acoid process. — This projects forwards and outwards from the 

 neck,** in a curved manner. Its tip has marks for the pectoralis 

 minor, coraco-brachialis and short head of the biceps. Its base has 

 a tubercle for the conoid ligament. 



CLAVICLE. 



A 'long bone placed transversely at the upper and anterior part 

 of the thorax, resembling in shape the italic / It articulates 



