72 LABORATORY MANUAL OF HUMAN ANATOMY 



(db) Posterior, medial, triangular part, or conoid ligament (Lig. 



conoideum). 



Between (da) and (db) look for the bursa of the coraco- 

 clavicular ligament (bursa ligamenti coracoclavicularis) . 



Deep Muscles of the Shoulder. 



Saw through the acromion at its junction with the spina 

 scapulae. Cut through the fascia covering the M. teres minor 

 and reflect it medialward; the septum passing from the fascia 

 infraspinata between the M. teres minor and the M. infraspi- 

 natus will be easily found and is the guide in the separation of 



FIG. 19. 



Caps, 

 acrom.-clav. 



Lig. Lig. 

 trapezoid. conoid. 



Lig. 

 trans, scap. sup. 



Clavicula 



Lig. coraco- 



acromiale 



Connection of the clavicle with the scapula ; anterior view. (From Poirier et Charpy, 

 Traite" d'Anat. hum., Paris, 1899, 2 ed., t. i. p. 610, Fig. 627.) 



the two muscles. Avoid injury to the A. circumflexa scapulae 

 between the M. teres minor and the scapula. Clean the following 

 muscles : 



(a) Supraspinous muscle (M. supraspinatus) . 



(b) Smaller round muscle (M. teres minor). 



(c) Infraspinous muscle (M. infraspinatus). 



(d) Subscapular muscle (M. subscapularis) . 



Study the form, position, origin, insertion, action, and inner- 

 vation of each. Find the bursa M. subscapularis and with a 

 probe demonstrate its continuity with the synovial cavity of the 

 shoulder- joint. In front of the upper part of the tendon of the 

 M. subscapularis, look for the bursa M. coracobrachialis. 



