DISSECTION OF THE BACK 



39 



lateral to the line of emergence of the others. The branch 

 which comes from the second thoracic nerve is the largest of 

 the series; and it may be traced laterally towards the shoulder, 



Great occipital nerve 



Third occipital nerve 



Sterno-mastoid 



Small occipital nerve 



Trapezius 



Semispinalis cervicis (O.T. complexus) 



Splenius capitis 

 Cervical nerves to trapezius 

 Accessory nerve 



Ascending br. of transverse cervica 

 Levator scapulae 



Descending br. of tr; 

 cervical artery and r 

 to rhomboids 



Rhomboideus mi 



Trapezius 

 (reflected) 



Rhomboideus 

 major 



Teres major 



Serratus anter 



Serratus posterior inferior 

 Latissimus dorsi 

 External oblique muscle 

 Trigonum Petiti 



Glutaeus medius 

 Glutajus maximus 



FIG. 17. Dissection of the Superficial Muscles and Nerves of the Back. 



across the spine of the scapula. The lower five or six 

 cutaneous nerves in the thoracic region are the terminal twigs of 

 the lateral branches of the posterior rami of the thoracic 

 nerves; and, consequently, they must be looked for at a 

 short distance from the middle line of the back. They 

 reach the surface by piercing the latissimus dorsi muscle on the 

 i 3c 



External branches of 



posterior divisions of 



lumbar nerves 



