v/,T\/v. 



245 



uivh. \\IHTC it forms adhesions. It ha^ hern described, in human anatomy, 

 as the f fine in transvenoKs. 



A<-( !<>n. It compresses the abdominal viscera when it contracts, and 

 presses them against the vertebral column. 



DIFFERENTIAL CHARACTERS 



OF THE MfSCLES OF THE 



ABDOMINAL REGION IN 



Uli THAN SOUPED 



ANIMALS. 



As has been already 

 saiil, the development of the 

 abdomintil tnni<- is in pro- 

 portion to the volume of 

 the digestive viscera. This 

 memhrane i^, therefore, 

 very wide and thick in 

 Kinnlnantt, while it is re- 

 1 to an insignificant 

 leaf in the Pig and Car- 

 nivora. In these animals 

 the internal crural aponeu- 

 rosis does not exist, and 

 is replaced by a cellular 

 layer. The nponeurosis of 

 the great oblique, instead of 

 being doubled into two 

 laminae at its posterior 

 border, is entirely reflected 

 to form the crural arch. 

 In the latter nnimals, the 

 great oblique is also dis- 

 tinguished by the extensive 

 development of its mus- 

 cular part, and the narrow- 

 ness of its aponeurosis. 



The muscular portion 

 of the fnuill olilique of Ru- 

 ,t* ncciijdcs the entire 

 space comprised between 

 the posterior Jx>rder of the 

 last rib, the extremity of MUSCLES OF THE ANTERIOR ASPECT OF THE BODY OF MAN ; 

 the transverse processes of ON THE LKFT SIDE THE SUPERFICIAL LAYER i< SOU, "N 



THE RIGHT THE DEEPER LAYER. 



1, Pectoralis major; 2, Deltoid; 3, Anterior border of the 

 latissimus dorsi ; 4, Serratus magnus; 5, Subclavius, right 

 side ; 6, Pectoralis minor ; 7, Coraco-brachialis ; 8, Biceps, 

 with its two heads; 9, Coracoid process of the scapula; 10, 

 Serratus magnus, right side ; 11, External intercostal muscle 

 of the fifth intercostal space; 12, External oblique; 1.., IN 

 aponeurosis with the linea alba ; 14, Poupart's ligament ; 

 15, External abdominal ring; 16, Rectu< mn<>-li> of i-ijjht 

 side; 17, Pyramidulis muscle; 18, Internal oblique; 19, 

 Conjoined tendon of internal oblique muscle and Poupnrt's 

 ligament. 



the lumbar vertebrae, and 

 the external angle of the 

 ilium. The small retractor 

 of the lat rili is not distinct 

 from the principal muscle. 

 This arrangement is like- 

 wise present in the smaller 

 domesticated nnimals. It 

 is also to be remarked that, 

 in Itmiiiniin tf, the tendinous 

 intersections of the great 

 - muscle of the aMomen 

 marked at its 



are more marked at 



superior than its inferior face ; and that the aponetirosis of the trann*rt is much thicker 



ami more resisting than in Solipeds. 



COMPARISON OF THE ABDOMINAL MUSCLES OF MAN WITH THOSE OP ANIMALS. 



With the exception of some slight differences, the abdominal muscles of Man present 

 the same disposition as those of the smaller animals. 



iUlominal tunic is not presont, but is replaced by a cellular layer which 



