. Cunningham's Text-book of anatomy. Anatomy. THE DUCT OF THE KIDNEY. 1269 Cortical substance Basal part of pyramid" Interlobar^ . artery k Pyramid Papilla J-- Renal artery Calyx ureter, in most cases, lies across the external iliac; but this arrangement is by no means constant. The course and position occupied by the abdominal portion of the ureter is well seen in Fig. 983. In X-ray photographs, the shadow cast by the abdominal portion of the ureter when the latter has been rendered opaque, is seen to fall immediately in front of the tips of the transverse processes of the lower lumbar v
. Cunningham's Text-book of anatomy. Anatomy. THE DUCT OF THE KIDNEY. 1269 Cortical substance Basal part of pyramid" Interlobar^ . artery k Pyramid Papilla J-- Renal artery Calyx ureter, in most cases, lies across the external iliac; but this arrangement is by no means constant. The course and position occupied by the abdominal portion of the ureter is well seen in Fig. 983. In X-ray photographs, the shadow cast by the abdominal portion of the ureter when the latter has been rendered opaque, is seen to fall immediately in front of the tips of the transverse processes of the lower lumbar vertebrae. The pars pelvina or pelvic portion of the ureter is about four or four and a half inches in length, and passes downwards on the lateral wall of the pelvis, immediately beneath the peritoneum, describing a curve which is convex backwards and laterally (Fig. 988). The most convex portion of this curve lies close to the deepest part of the greater sciatic notch (Fig. 988). As it descends upon the lateral wall of the pelvis the ureter forms the pos- terior boundary of the triangular district known as the obturator triangle. The lower limit of this triangle is formed by the ductus deferens, and the upper and anterior boundary by the external iliac vessels and the pelvic brim (Fig. 988). In its course within the pelvis the ureter lies in front of the hypogas- tric artery, and crosses the medial aspect of the obturator nerve and ves- sels and of the obliter- ated umbilical artery. About the level of the spinaischiadica,or ischial spine, the ureter is crossed from before backwards by the ductus deferens, and from this point onwards it is not so intimately re- lated to the peritoneum. It now bends some- what medially and forwards, to reach the lateral angle of the bladder, and comes into relationship with the upper end of the vesicula seminalis, in front of which it lies. The ductus deferens having crossed the ureter also turns medially, and as it does so it lies at a higher l
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