ABDOMEN AND PELVIS 



455 



White Line (Linea alba). 



What aponeuroses enter into the formation of the linea alba? 

 Between what points does it extend? Note that it is broad in 

 the upper two-thirds and rapidly diminishes in breadth in the 

 lower third. Do you find foramina in the linea alba above the 

 umbilicus ? 



Make a drawing of the dissection at this stage. 



Transversal Fascia (Fascia transversalis) (O. T. Transverse Fascia). 

 On the right side cut through the M. transversus along the 

 linea semilunaris and carefully reflect this muscle lateralward. 

 Note under it two layers : externally, the fascia transversalis; 

 internally, the peritoneum. These are separated by " extra- 

 peritoneal fatty tissue. " Trace the fascia inferiorly. Note its 



FIG. 234. 



Peritonaeum parietale 



N. femoralis 

 Fascia iliaca 



Plica epigastrica 



Fovea ingitinalis 

 lateralis 



M. iliopsoas ' / 

 Vasa sperm at ic<\ 

 A, iliaca extern ' 



I', iliaca rxterna 



Plica pubovesicalis 



^ wnb&icalis 

 \ media 



^ Fovea inguinalis 

 media lit 



W/m niubilicalis 

 laterals 



\ Farm xupravesicalis 

 \ Vesica urinaria 

 Plica vesicalin tranarersa 



Frontal section of the lower part of the trunk to show the lower part of the parietal peritoneum and 

 its folds. Seen from behind. (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 370, Fig. 611.) 



relation to the ligamentum inguinale, to the crista iliaca, and 

 medial ward to the linea alba. 



On the left side, from a point immediately above the umbili- 

 cus, make two incisions, one passing to the spina iliaca interior 

 superior, the other to the right of the umbilicus and two centi- 

 metres to the right of the linea alba, down to the ramus supe- 



