43 



PRACTICAL ANATOMY. 



1 . Describe tlic acromion process. 



It is a projection of bone, a continuation of the scapular spine. It has an 

 upper and an under surface, an inner and an outer border, and a tip. Its inner 

 border articulates near the tip with the clavicle. Its outer border gives origin to 

 the deltoid muscle in part. Its upper surface is occupied by the insertion of the 

 trapezius muscle, by the origin of the deltoid, and by a subcutaneous area between 

 the two. Its under surface is smooth and unoccupied. (Fig. 240.) 



2. Describe the interarticular fibro-cartilage. 



When present, it resembles others of the same class in function and attach- 

 ments. 



Conoid ligament 



Transverse scapular ligament 



Trapezoid ligament 



Coraco-acromial ligament 



Short head of biceps 

 Subscapular tendon 



Capsule of shoulder 



Long tendon of 

 biceps 



FIG. 299. ANTERIOR VIEW OF SHOULDER, SHOWING ALSO CORACO-CLAVICI'LAR AND CORACO- 

 ACROMIAL LIGAMENTS. 



THE COR AGO-CLAVICULAR LIGAMENTS. 



Turn the clavicle upward, having cut the same through the middle third, an< 

 you will see a strong band of ligamentous tissue extending from the clavicle to 

 the coracoid process. This consists of two parts : an anterior and outer part, called 

 the trapezoid ligament ; a posterior and internal portion, called the conoid liga- 

 ment. The action of these ligaments is to prevent upward dislocation of the 

 acromial end of the clavicle in fracture of the bone. 



The intrinsic ligaments of the scapula are : (i) The coraco-acromial ; (2) the 

 transverse scapular (Fig. 299) ; (3) the inferior transverse scapular. (Fig. 298.) 



The coraco-acromial extends from the outer border of the coracoid process 

 by a broad base to the tip of the acromion process. Under it you will find the 

 tendon of the stipraspinatus muscle in a bed of fatty connective tissue. 



The transverse scapular ligament bridges over the suprascapular notch, 

 converting the same into a foramen, terminating externally in the coracoid 

 process. On the ligament lie the suprascapular vessels ; beneath the ligament, in 

 the foramen, you will find the suprascapular nerve. (Fig. 299.) 



