THE SUPERIOR EXTREMITY 



margin of the sacrospinalis muscle, a short distance above the 

 ilium. They are the terminal twigs of the lateral divisions 

 of the posterior rami of the upper three lumbar spinal nerves ; 



Greater occipital nerve 



Third occipital nerve 



Sterno-mastoid 



Lesser occipital nerve 



Trapezi 



Deltoid 



Infra- 

 spinatus 



Teres major 



Rhomboideus 

 major 



Triangular 

 space 



Latissimus dorsi 



Lateral divisions of 

 posterior rami of 

 lumbar nerv 



Semispinalis capitis (O.T. complexus) 



Splenius capitis 

 Cervical nerves to trapezius 

 Accessory nerve 



. Ascending br. of transverse cervical arter 

 Levator scapulae 



Descending br. of trs. 

 cervical artery and dorsal 

 scapulae nerve 

 Rhomboideus minor 



Trapezius 

 (reflected) 



Rhomboideus 

 major 



Teres major 



Serratus anterior 



Serratus posterior inferior 

 Latissimus dorsi (cut) 

 -External oblique muscle 

 Trigonum lumbale (Petiti) 



Gluteeus medius 



Glutaeus maximus 



I 



FIG. 26. Dissection of the Superficial Muscles and Nerves of the Back. 



and they differ from the nerves above, inasmuch as they turn 

 downwards over the crest of the ilium to supply the skin of 

 the gluteal region (Fig. 26). 



The cutaneous arteries which accompany the cutaneous 

 nerves of the back are derived from the posterior branches 

 of the intercostal and lumbar arteries. 



