LATISSIMUS DORSI. 



191 



Between the adjacent borders of tlie latissimns dorsi, trapezius, and rliom- 

 boideus major, there is left, when the scapula is di-awn forward, a triano-ular ai-ea 

 in which a portion of one or 



two ribs and of an intercostal 

 space becomes sui3erficial ; this 

 is taken advantage of for the 

 purpose of auscultation. 



Fig. 165. 



Fig. 165. — Deeper View of the 



J\IUSCLES OP THE TrUXK, 



Shoulder and Hip. (After Boiir- 

 geiy.) (A.T.) i 



The trapezius, latissimns dorsi, 

 deltoid, ghiteus maximus and ex- 

 ternal oblique muscles liave been 

 removed. The bones are lettered 

 as in the preceding figure. 



1, splenius capitis and splenius 

 colli ; 1', lower end of splenius 

 colli ; 2, complexus near its inser- 

 tion ; 3, levator anguli scapula.' ; 

 4, rhomboideus minor ; above it -f , 

 a part of the serratus posticus supe- 

 rior ; 5, rhomboideus major ; 6, part 

 of the longissimus dorsi ; 6', part of 

 the tendons of insertion of the 

 sacro-lumbalis ; 7, part of the spi- 

 nalis dorsi ; 8, upper, and 8', lower 

 part of the serratus posticus infe- 

 rior ; 9, oliliquus abdominis inter- 

 nus ; 10, supraspinatus ; 11, infra- 

 spinatus ; 12, placed upon the long 

 head of the triceps, points to the 

 teres minor ; 13, teres major ; 14, 

 serratus magnus ; 15, gluteus 

 medius ; 16, pyriformis ; 17, portion 

 of the obturator intemus ; + and -1- , 

 superior and inferior genielli ; 17', 

 the intra-jjelvic ijortion of obturator 

 internus ; IS, the tendon of the obtu- 

 rator externus passing to its inser- 

 tion ; 19, quadratus femoris ; 20, 

 upper part of the adductor magnus. 



Vark'tie.'}. — The number of 

 dorsal vertebraj to which the 

 latissimus dorsi is attached 

 varies from four to seven or 

 eight, and the number of the 

 costal attachments is also incon- 

 stant, being frequently dimiri- 

 ished and more rarely increased. 

 JIuscular bands {a.riUary arcfw.s') 

 are sometimes seen to stretch from 

 the border of this muscle across 

 the axilla to its anterior part, 

 where they terminate various- 

 ly, ia the tendon of the greater 

 pectoral, in the coraco-brachialis 

 muscle, the biceps, or in the 

 fascia. There is also occasion- 

 ally a slip of attachment to the scapular part of the triceps. 



