50 



LABORATORY MANUAL OF HUMAN ANATOMY 



Cut through the M. trapezius by a vertical incision five centi- 

 metres later alward from the median plane, avoiding injury to 

 the muscles of the second layer. Dissect out, on its deep surface, 

 the following structures : 



FIG. 6. 



Processus costarius vertebrae lumbalis IV. 



M. iliocostalis 

 Fascia lumbodorsalis 

 Ligamentum lumbocostale 



M. longissimus 



M. multifidus 



M. quadratus lumborum 



Adipose tissue 



Processus spinosus 

 i verebrae 



:ra> lumbalis III. 



Fascia transversalis 



M. latissimus 

 dorsi 



Upper surface of the 

 vertebra lumbalis 

 IV. 



M. transversus abdominis 

 M . obliquus interims abdominis i 

 M. obliquus externus abdominis 



Fascia superficial^ 

 Integumentum commune 



M. rectus abdominis 



Linea alba 



: : Umbilicus 



Lamina anterior Lamina posterior 

 Vagina M. recti abdominis 



The muscles and fasciae in a transverse section of the right half of the wall of the trunk. 

 (After Toldt, Anat. Atlas, Wien, 1900, 2 AufL, p. 281, Fig. 520. ) 



(a) External ramus of accessory nerve (ramus externus N. accessorii). 



(b) Muscular rami from cervical nerves (rami muscular es Nn. cervica- 



lium). 



