16 Internal pudendal vein. V. pudenda interna. It runs in the lateral wall of the ischioanal fossa and enters the pelvis via the lower division of the greater sciatic foramen [[infrapiriform foramen]]. ABC
17 Deep veins of penis. Vv. profundae penis. They arise from the roots of the corpus cavernosum and corpus spongiosum and drain into the prostatic venous plexus via the deep dorsal vein of the penis. C
18 Deep veins ofclitoris. Vv. profundae clitoridis. Equivalent to the deep veins of the penis. B
19 Middle rectal veins. Vv. rectales mediae. Branches from the rectal venous plexus located in the lesser pelvis. They anastomose with the superior rectal vein and the inferior rectal veins. A C
20 Inferior rectal veins. Vv. rectales inferiores. Arise from the anal region, join the internal pu-dendal vein and anastomose with the middle rectal veins and the superior rectal vein. B C
21 Posterior scrotal/labial veins. Vv. scrotales/ labiales posteriores. Arise from the scrotum or labia and join the internal pudendal vein. B C
22 Vein of bulb of penis/vestibule. V. bulbi penis/ vestibuli. Arise from the bulb of the corpus spongiosum and convey blood either to the deep dorsal vein of the penis (clitoris) or into the internal pudendal vein. B C
23 External iliac vein. V. iliaca externa. Arises from the upper end of the femoral vein below the inguinal ligament and ends where it joins the internal iliac vein to form the common iliac vein. A
24 Inferior epigastric vein. V. epigastrica inferior. Arises from the posterior side of the anterior abdominal wall and extends as a companion vein of the inferior epigastric artery. A
24a Pubic branch (accessory obturator vein). R. pubicus (v. obturatoria accessoria). It anastomoses with the branch of the obturator vein at the inner surface of the pubis. A
25 Deep circumflex iliac vein. V. circumflexa iliaca profunda. Companion vein of the deep circumflex iliac artery. A
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.