ANATOMY IX A NUTSHELL. 



59 



descends in the bicipital groove, in which it is retained by a fibrous prolonga- 

 tion from the tendon of the Pectoralis major. 



The short head arises from the apex of the coracoid process in common 

 with the Coraco-brachialis. 



Insertion. — Back of tuberosity of radius; fascia of forearm. (Plate XXV.) 



Action. — Flexes and supinates forearm, and tenses fascia. 



Nerve Supply. — Fifth and sixth cervical through the musculo-cutaneous. 



Blood Supply. — Brachial artery, muscular branches. 



Omo-hyoid — Description. — This muscle passes from near the suprascapular 

 notch of the scapula to the hyoid bone, thus dividing the anterior and posterior 

 triangles of the neck into two triangles each. (Plate XIV.) 



Origin. — From the superior border of the scapula, internal to the supra- 

 scapular notch. (Plate XX.) 



PLATE XIX. 



MIDDLE CONSTRICTOR OF PHARYNX. 

 LESSER CORNU. 



GREATER CORNU 



\ f/ 1/1 'If 



HYO-GLOSSUS. 



STYLO- HYOID. 

 THYRO-HYOID. 



GENIO-HYOID 



MYLO-HYOID 



STERNO-HYOID. 



The Hyoid Bone 



Insertion. — Into the lower borderof the bgdy of hyoid bone. (Plate XIX.) 



Blood Supply. — Lingual and superior thyroid from the external carotid, 

 and the inferior thyroid from the thyroid axis. 



Action. — Depresses hyoid bone. 



Nerve Supply. — Branches from the loop betweenthe cervical plexus and 

 the 12th cranial nerve. 



Blood Supply of Scapula. — The glenoid fossa, supraspinous fossa, infra- 

 Bpinous fossa and the spine all get the suprascapular artery from the thyroid 

 axis. The infraspinous fossa, in addition, receives the dorsails scapula? which is 

 a branch of the subscapular, from the third portion of the axillary. 1 he 

 acromion process is supplied by branches from the arcomial thoracic artery. The 

 venter receives the subscapular, and a subscapular branch from the suprascapular; 

 andthe vertebral border receives the posterior scapularfrom the suprascapular. 



