248 



COMPARATIVE ANATOMY 



The Clavicle. The ventral element of the pectoral girdle is the 

 clavicle or collar bone. Laterally, the clavicle articulates with the 

 acromion process of the scapula; medially, with the manubrium just above 



iTROCHLEA 



,MEDIAL EP I CONDYLE 



/SHAFT 



tatauai&i 



iaHiii 



HUMERUS 



LESSER TUBERCLE-' 



GREATER TUBERCLE' 



SEMILUNAR NOTCH, 

 CORONOID PROCESS -,<<CViLj«^w?\ 

 SHAFT ^^Z^ '7"--^^y?r ^ 



ULNA TUBEROSITY- — > oleCRANON\ 

 RADIAL NOTCH/ ^^^'|'|9^°''^ 



TUBEROSITY- 



.1^ ■lujjjijmij*/^ 



^STYLOID PROCESS 



C. RADIUS 



GREATER 

 TROCHANTER! 



-MEDIAL MALLEOLUS -tidia 



I _ r. T I D I A 



(INFERIOR 



ARTICULAR SURFACE ,^^,^^, 



INTERCONDYLOID EMINENCE' 



Fig. 206. — The long bones A~F of the human arm and leg. Compare with those shown 

 in Fig. 204. (Redrawn from Sobotta.) 



the first costal cartilage. The clavicle, with its two curvatures, roughly 

 resembles the italic letter /. Several muscles have their origin at least 

 in part on the clavicle, among them the trapezius, deltoid, pectoralis, 

 sterno-mastoid, and sterno-hyoid. 



