MUSCLES OX POSTERIOR NECK AND BACK. 



491 



FIG. 150. 



vertebrae ; these unite to form a fleshy belly, which is 

 inserted into all the base of the scapula from its spine to 

 the superior angle. 



Function. To raise the shoulder, when acting with the 

 trapezius. 

 When act- 

 ing by itself 

 it elevates 

 the superior 

 angle of the 

 scapula, and 

 in propor- 

 tion depress- 

 es the acro- 

 mion. 



Third lay- 

 er. Dissec- 

 tion. Ke- 

 move the 

 rhomboidei 

 by detach- 

 ing them 

 from the 

 base of the 

 scapula, and 

 the latissi- 

 rnus dor si, 

 by dividing 



along its centre and reflecting towards the spine, and the 

 third layer is exposed, which consists of the three follow- 

 ing muscles : 



The serratus posticus superior, situated at the upper and 



FIG. 150 represents the Muscles of the Back, seen after removing the super- 

 ficial set. 1 Trapezius. 2 Tendon of the two trapezii. 3 Spine of scapula. 

 4 Latissimus dorsi. 5 Deltoid. 6 Infra-spinatus, teres-minor. 7 External 

 oblique. 8 Gluteus medius. 9 Gluteus maximus. 10 Levator scapulae. 11 

 Rhomboideus minor. 12 Rhomboideus major. 13 14 Splenius capitis etcolli. 

 15 Origin of latissimus dorsi. 16 Serratus posticus inferior. 17 Supra spina- 

 tus. 18 Infra-spinatus. 19 Teres minor. 20 Teres major. 21 Long head 

 of triceps extensor cubiti. 22 Serratus major anticus. 23 Internal oblique. 



