972 



THE NERVOUS SYSTEM 



mus dorsi and the multifidus spinae; they chiefly end in twigs to the adjacent 



muscles, but not uncommonly they give small cutaneous twigs which pierce the 



latissimus dorsi and the trapezius and end in the skin near the mid-Hne of the back. 



The lateral branches of the upper six thoracic nerves pass between the longis- 



FiG 750 — Distribution op the Posterior Primary Divisions of the--.Spinal Nerves. 



(Henle.) 



Trapezius 



Semispinalis colli 



Multifidus 



Rhomboideus 

 major 



Lastissimus dorsi 



External oblique 



Glutens mazimus 



simus dorsi and tlic ilio-costalis dorsi (acccssorius) and end in those muscles, but 

 the lateral branches of the six lower nerves are longer; they pass into the interval 

 between the longissimus dorsi and the ilio-costalis dorsi and give branches to them, 1 

 and then they pierce the latissimus dorsi and are distributed to the skin of the » 

 lower and lateral part of the back. 



