THE TRAPEZIUS GROUP. 209 



Preparation. A subtriangular flap of skin was lifted as di- 

 rected in 610, together with the dermal muscles connected there- 

 with. The flap was reflected dorsad, but is omitted from the figure ; 

 the reflected dorsal end of the dermal muscle called supra-cermco- 

 cutaneus, however, is shown. Both cut edges of the skin were 

 lifted and retracted or reflected slightly. 



The dermo-humeralis ( 629) was mostly removed with the skin, 

 but its brachial end appears just dorsad of the elbow. The fat and 

 connective tissue have been removed so as to leave the borders of 

 the muscles more distinct. From the hiatus trapezii, just dorsad 

 of the convexity of the shoulder, the fat has been removed so as to 

 expose the lymphatic gland (Gl. lymphatica), and the hiatus itself 

 was extended dorsad so as to expose the ventral or lateral margin 

 of the occipito-scapularis. 



In this and the other descriptions of the myological figures, the parts are enumerated 

 under three heads : bones, etc. ; muscles ; vessels, nerves, glands, etc. 



Bones. Clavwula Collar bone ( 432). In this figure the bone itself does not appear, 

 but the position of its mesal or sternal end is indicated by the dotted line from the word 

 clavicula ; see rhaphe. 



Mesoscapida Spine of the scapula ( 390). The position of this ridge of the scapula, 

 intervening between the MM. acromio-trapezius and spiuo-deltoideus, is approximately 

 indicated by the name. It is more distinctly shown in Fig. 67. 



Metacromion ( 396). This process of the glenoid end of the mesoscapula may be felt 

 through the muscles at a point corresponding with the beginning of its name. 



Fascia. This strip of fascia hardly deserving the name of ligament passes from the 

 lateral or scapular end of the clavicle to the surface of the M. supraspinatus, as better 

 shown in Fig. 67. 



Rhaphe (trapezio-deltoidea) ( 616). This line or seam of connective tissue, between 

 the M. davo-deltoideus and the MM. daw-trapezius and davo-mastoideiis (Fig. 67), coin- 

 cides nearly with the position of the clavicle. It is usually more distinct upon the ental 

 aspect, and is somewhat exaggerated in the figure. The word is sometimes spelled raphe. 



Spina neurales vertebr. (vertebrarum) thoraci. (thoracicorum), The third and thirteenth 

 thoracic (" dorsal") neural spines (Fig. 30). The spines themselves do not appear, but the 

 numbers 3 and 13 indicate the positions of the third and the last of the series. 



Muscles. In the figure the name of each muscle is preceded by M,, the initial of 

 Musculus. 



Acromio-deltoideusTlie acromial portion of the deltoid ( 670). This is the interme- 

 diate one of the three muscles which, in the cat, seem to represent the single deltoid 

 muscle of man. It and the spino-deltoideus are inserted, like the human deltoid, upon 

 the humerus ; but the third portion, the davo-deltoideus (the "delto-claviculaire" of 

 Straus-Durckheim) is associated with the brachialis and inserted upon the ulna. 



Acromio-trapezius The acromial portion of the human trapezius ( 613). This is the 



intermediate one of the three muscles which, in the cat, appear to us to represent the 



human trapezius ( 607). In the figure the name is written obliquely across the ecaj/ulir 



end of the muscle ; the word tendon, near its vertebral end, indicates the imperfectly 



14 



