M M. The peritonaeum lining the groin.
N. The epigastric vessels lying between the peritonaeum, M, and the transversalis fascia, L2. O. The umbilical ligament.
P. The neck of the sac of an external inguinal hernia formed before the spermatic vessels.
Q. An interval which occasionally occurs between the umbilical ligament and the epigastric artery.
R and Q. Situations where the direct inguinal hernia occurs when, as in this case, the umbilical ligament crosses the space named the internal fossa—the triangle of Hesselbach.
S. Lower part of the right spermatic cord.
T. The bulb of the urethra.
U. External iliac vein covered by the peritonaeum.
V. External iliac artery covered by the peritonaeum.
W. Internal iliac artery.