mi \i;l< 



r a much larger an a and form the main portion of the dome of the di 

 the individual serrations of origin thi i 

 tissue. 



Tin- greater part of the lumbar portioi 

 vertebra-. Upon either side there may be distinguished thi 

 intermedium, and laterale. The inner crura, sometin i simply tl 



strongest parts. Theyarise by tendinous fibers from the anteri 

 lumbar vertebrae and from the anterior longitudinal ligament and the inti 

 between the two vertebra?, and their outer mai 



remain tendinous. The) may arise at different levels on th< the 



case, it is the right crus which is always the longer of the 1 I 



at the level of the twelfth thon rtebra or at that of the eleventh rtcbral 



to form a pointed arch with tendinous margins, which is com i 

 surfaces of the last thorac ic and the first lumbar vertebra. The openi 

 to the aorta and is consequently designated th< i i I 



The fibers of the entire lumbar portion, and especially I of the inner cr 



almost vertically upward in front of the lumbar column, but j their ii 



central tendon tiny follow the curvature of the diaphragm, and in tl 

 second opening in the diaphragm, which is elliptical, the loi 

 margins of the foramen are purely muscular and, 



known as the esophageal opening. In its formation there usually i the 



libers of the two inner crura. 



The middle crura are considerably weaker and more -lender than the in: 

 arise by short tendons from the lateral surfaces of the nd lum 



at first separated from die inner crura by narrow slits, but I their i- tral 



tendon the_\- become i losely approximated to the muscular tis 



The outer crura practically arise from the two tendinous lun ;tal arc': 



external lumbocostal arci Ha The ini 



ligament) passes from the body ^i the first lumbar vertebra to die I the trai 



tlu- same bone, r the | while the 



arcuate ligament) extends from the trans the first lum Ifth 



rib and bridges over the quadratus lumborum. The -lender fil 

 of the diaphragm arise chiefly from the- internal luml and a 



- and lateral margin of the bod) of tlu- first lumbar vertebra. I ' 

 the external lumbocostal arch and these may be entirely a 1 they n I the i 



between the lumbar and the costal | o\ the diaphragm. The : ura 



are considerably shorter than tho-e oi the inner and middK 



The central tendi i (Fig. a fibrous layer which may be eith - i like 



a clover- leaf* and its fasciculi undergo manifold di >ns. Th< o nvex surface of the central 



tendon is situated anteriorly; the more marked concavity is pi.: riorly. In it there may 



be recognized a middle almost plane or but slight 1) . which ' the 



* The clover-leal form is when t mal portion. 



