7 



Anatomy of Skeleton 



the spine divides the dorsal surface into an upper supraspinous fossa, and a lower 

 infraspinous fossa, giving origin to muscles of same name : the infraspinous fossa has 

 a narrow area running along its outer side for the two Teres muscles. The spine 

 gives insertion to Trapezius and origin to Deltoid along its upper and lower borders, 

 and these borders are respectively continued into the inner and outer borders of the 

 acromion : where the lower border of spine joins outer border of acromion is the 

 acromial angle. An articular facet for the clavicle occupies the front portion of the 

 inner border of the acromial process : in front of this the acromion presents a free 

 extremity. 



The angles are : (a) Lower, covered dorsally by Teres major and ventrally by 

 Serratus magnus : often spoken of as " the angle." (b) Upper and internal, (c) Upper 



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FIG. 56. Dorsal and ventral views of left scapula. To tell left from right hold the spine dorsally, 

 the acromion externally, and the pointed " angle " downwards. 



and externa : this carries the glenoid mass, spoken of as the head, which has a glenoid 

 cavity for articulation with head of humerus : the head is joined to the rest of the tone 

 by the neck, which lies outside the free border of the spine : the rest of the main bone 

 is then spoken of as the body. 



Borders. Inner or vertebral border thin, gives attachment to Levator anguli 

 scapulae opposite supraspinous fossa, to Rhomboideus minor opposite expanded base 

 of spine, and to Rhomboideus major for the rest of its extent. 



Outer or axillary border : sharp, may run somewhat on to dorsal surface between 

 the Teres muscles : below neck has a rough area for origin of long head of Triceps. 



Upper border : sharp internally, then presents a marked suprascapular notch for 

 the suprascapular nerve, which is bridged by ligament occasionally ossified : immediately 

 outside this supports a curved projection, the coracoid process, which arises from the 

 border between the notch and the glenoid rim. Coracoid process projects forwards 

 and outwards and turns slightly downwards, therefore has a concave lower surface, 



