THORACIC LIMBS. 63 
(lateral angle of human anatomy), is much heavier than the 
others and bears a concave, pear-shaped articular facet, the 
glenoid fossa, for articulation with the humerus. The border 
with which this angle is more nearly continuous may be called 
the glenoid border (c) (axillary border of human anatomy). 
Near the narrower cranial end of the glenoid fossa is a 
small curved projection of the bone, the coracoid process (Fig. 
45, m). The border upon which it lies is the coracoid border 
(6) (superior border of human anatomy). The third border is 
turned toward the vertebral column and is the vertebral 
border (a). 
The angle between the glenoid and vertebral borders is the 
glenovertebral angle (/) (inferior angle of human anatomy), 
and that between the coracoid and vertebral borders the 
coracovertebral angle (¢) (medial angle of human anatomy). 
The medial or costal surface (Fig. 45) is smooth and nearly 
flat. A shallow furrow (7) marks the position of the spine of 
the scapula. Between the furrow and the coracoid border are 
two oblique parallel ridges (@ and o’) for the insertion of muscle- 
fibres. Near the glenoid border is a well-marked ridge sepa- 
rating the subscapular fossa (///), comprising the greater part 
of the medial surface of the scapula, from the fossa in which 
the teres major muscle has origin (/V). The surface presents 
several nutrient foramina usually directed toward the glenoid 
angle. 
The lateral surface (dorsal surface of human anatomy) 
(Fig. 44) is divided by the spine (g) into two portions. The 
portion of the scapula craniad of the spine and the cranial 
surface of the spine bound the supraspinous fossa (fossa supra- 
spinata) (/), while the surface caudad of the spine and the 
caudal portion of the spine bound the infraspinous fossa (fossa 
infraspinata) (//). 
The spine (g) begins as a triangular elevated area in the 
middle of the vertebral margin and runs toward the glenoid 
angle. It rises gradually for about two-fifths of its length and 
then the margin becomes broader and the spine remains of the 
same height to its glenoid end. There is a rough thickening, 
the tuberosity () of the spine, situated on its free border about 
