82 



BONES OF THE UPPER LIMB. 



The spine of the scapula is a massive plate of bone projecting back- 

 wards from the dorsum, and curving slightly upwards. It extends 

 outwards and a little upwards from the internal border near its upper 



Fig. G9 a. 



Fig. 69 h. 



Fig. 69 ff. — Eight Scapula prom behind. (A. T.) J 



1, glenoid head ; 2, superior angle ; 3, inferior angle ; 4, si)ine ; 4, at the base, 

 triangular smooth surface of the spine ; 5, acromion ; 6, coracoid process ; 7, supra- 

 spinous fossa : 7', infraspinous fossa ; 1 to 2, superior border ; 2 to 3, posterit)r border 

 or base ; 1 to 3, external or inferior border ; 10, is ojiposite the oval surface of origin of 

 the teres major muscle ; 11, the oblique groove where the teres minor muscle rises; 12, 

 the rough ridge where the long head of the triceps rises ; 13, supra-scapular notch ; 14, 

 is below the great scapular notch. 



Fig. CO h. — Eight Scapula from before. (A. T.) ^ 



1, 5, 6, and 13, as in fig. 69 ; 5' articular facet en the acromion for the clavicle; 

 8, subscapular fossa ; 9, long, narrow surface, and 9', triangular rough surface, se2Jarated 

 from the subscapular fossa and giving attachment to the upper and lower parts of the 

 serratus magnus muscle. 



fourth, towards the middle of the neck of the scapula, and becoming 

 gradually elevated towards its external extremity, it turns forwards and 

 is continued into the acromion process. The upper and lower sur- 

 faces are smooth, concave, of a triangular form, and form part respec- 

 tively of the supra-spinous and infra-spinous fossae. It presents two 

 unattached borders, the most prominent of which is subcutaneous and 

 arises from the internal border of the bone by a smooth, flat, triangular 

 surface, over which the tendon of the inferior part of the trapezius 

 muscle glides, as it passes to be inserted into a rough thickening 

 beyond. In the rest of its extent this border is rough, l)road, and 

 serpentine, giving attachment by its superior margin to the trapezius, 

 and by its inferior to the deltoid muscle. Tlie anterior or external 

 border, short, smooth, and concave, arises near the neck of the scapula, 

 and is continuous with the under surface of the acromion, surrounding 

 thus tlie (jreat sccqndar notch between the spine and the neck of the 

 bone. 



