THE LYMPHATIC SYSTEM. 



253 



angles of the maxillary septum. At the root of the anterior ex- 

 tremity it divides to enclose the root of the limb, and so form the 

 axillary septum. 



(3) The pectoral septum (Septum pectorale) y (Figs. 170 and i/iy>) 

 is attached to the superficial surface of the 3L pedoralix (Portlo 

 sternalis, anterior wok posterior) ; it runs transversely across the body, 

 and is attached at its outer end to the ventral and to the maxillary 

 septa. The septum passes obliquely backwards and downwards 

 to be attached to the skin, and so forms a very acute angle with 

 the 31. cutaneuz jjedori-s (r//) : a vertical band of connective-tissue, 

 broad behind, narrow in front, extends in the middle line from the 

 septum to the body wall ; from it a certain amount of loose con- 

 nective-tissue extends in all directions, 'and forms open lymph-spaces 

 between the J/J/. cu.tcniei feet o rales and the vertical septum. 



(4) The perineal septum (^e^ti'iii 

 fjerineale}, (Fig. ijoyj*?). This me- 

 dian septum extends from the at- 

 tachment of the dorsal septum to the 

 tip of the urostyle, backwards to the 

 symphysis pubis, where it joins the 

 ventral septa. In its attachment 

 it follows the middle line of the 

 perineum. 



(5) The maxillary septum 



turn maxillare), (Figs. 170, 171 ///) 



IS attached by either extremity Sinus thoracicus tnmsversus (Ecker). 



to the dorsal septum, near the C P M. cutaneus pectoralis. 

 tympanic membrane, is continued f ^^5S* 

 downwards to unite with the 



anterior end of the ventral septum, and then runs across the 

 anterior pectoral region, forming a curve with the convexity 

 forwards. It has inserted into it fibres of the 3/. smbauurittaris. 

 The septum is formed of very loose tissue, and frequently contains 

 deposits of fat; it encloses a well-marked septal sinus, the Sinn* 

 tkoracicv* traxsver#u& (Ecker). 



(6) The iliac septum (Figs. 169, 172 15, 173 S') is a septum 

 extending from the dorsal septum to the inguinal septum. It is 

 attached to the dorsal septum opposite the anterior end of the 

 37! yhi.taev.*, and extends outwards and downwards to the inguinal 



