ANATOMY IX A XUTSUhLL. 



41 



Insertion. — Body of the hyoid bone. (Plate XIX.) 

 Action. — To depress the hyoid bone. 



Nerve Supply. — Branches from Loop of communication between the 

 cervical plexus and the twelfth cranial nerve. 



TUBEROSITY FOR CONOID LI GMT 



OBLIQUE VINE FOR 

 TRAPEZOID LICKT. 



PLATE X. 



— POSTERIOR 

 SUBCLAVIU5 



STERNO-THYROiD. 

 STERNO HYOID. 



ARTIC. 

 WITH THE 

 SCAPULA. 



capsular lkvm-t pectoral1s major. 



anterior. 



Left Clavicle. Ixferioh Surface. 



Blood Supply. — Lingual, inferior and superior thyroid arteries. 



Sterno-thyroid. — Origin. — (1) Posterior surface of the manubrium of the 

 sternum and the cartilage of the first rib, occasionally from the second rib and 

 _' -ometimes from the clavicle. 



Insertion. — Oblique line of ala of thyroid cartilage. 



Action. — Depressor of larynx. 



Nerve Supply. — Branches from the loop of communication between the 

 cervical plexus and the twelfth cranial nerve. 



Blood Supply. — Lin qual, inferior and superior thyroid arteries. 



PLATE XL 



-ANTERIOR. 



PECTORALIS 



MAJOF 



acromial end 



trapezius 



— posterior.- — 

 Left Clavicle. Superior Surface. 



Pectoralis major. — Description. — (Plate XV.)- This muscle is situated 



in front of the axilla, also on the upper and foreparl of the chest. P is trian- 

 gular, being both broad and thick. From it s origin the fibers nil pa-- towards 

 its insertion, giving it the shape of a fan. tts tendon, which i- flat, is aboul 

 two inches in breadth. The tendon i> made of two layers placed one in front 

 of the other and usually blended together below. The anterior layer which is 

 thicker receives the clavicular and upper half of the sternal portion of the mus- 

 cle and its fibers are inserted in the same order a- that in which they arise. The 



