m 



SHOt'LDER -GIRDLE 



47 



Connected with the ventral end of the supra-scapula 

 and passing vertically downwards is a flat bone, 

 broadened at each end, the scapula or blade-bone 

 (Fig. n, scp: Fig. 12, sc). From its lower end two bones 

 (Fig. 12, cl, co : Fig. n, cor) pass directly inwards, 

 parallel with one another, to end in a plate of cartilage 

 which meets with its fellow of the opposite side in the 

 middle line of the chest. The more anterior of these (cl) 



FIG. 12. The shoulder-girdle of the Frog from the ventral aspect, the left scapula 



being straightened out. The cartilage is dotted, (x 3.) 



cl. clavicle ; co. coracoid ; g. glenoid cavity ; sc. scapula ; s. sc. supra-scapula ; 

 st sternum : st'. omosternum ; st". x.phisternum. (From Howes's Atlas of 

 Practical Elementary Zootomy.)- 



is a narrow bone called the clavicle, or collar-bone, the 

 posterior one is broader and is known as the coracoid (co) . 

 Between the scapula on the one hand and the clavicle 

 and coracoid on the other, there is a cartilaginous 

 interval, the posterior edge of which is scooped out into 

 a depression, the glenoid cavity (Fig. 12, g ; Fig. n, gl) 

 for the articulation of the upper-arm bone. 



Connected with the median ventral portion of the 

 shoulder-girdle is the sternum, or breast-bone, which 



