Comparative Male Repro Anatomy (Mod. 5)

Boar Repro Anatomy

What “type” of penis does the boar have? What is its most notable feature?

Penis type: fibroelastic penis

Most notable feature:

• Corkscrew cock

  • Shaft of penis twists ONCE ANTICLOCKWISE

  • Then tip of penis is in an anticlockwise spiral

• Glans are also small and thin… can’t really be seen on the penis

Describe how the boar penis looks when erect… What happens to the corkscrew conformation?

Length increases by 25% through extension of sigmoid flexure

Thickness increases by 20%

Penis spirals EVEN MORE… goes from 1 turn to 6 anticlockwise turns

Describe the boar prepuce… what is the preputial diverticulum?

Prepuce

• Long and narrow, mimics the shape of penis

Associated to the dorsal wall of the prepuce is the preputial diverticulum

• Is a gland that produces and distributes PHEROMONES

• Possible for this area to become infected… results in swelling, can be mistaken for an umbilical hernia

Describe the boar testes… list some characteristics that could help you differentiate between these and other testicles

Testes sit ALMOST vertically in the scrotum

There IS a visible mediastinum in the center of the parenchyma

Capsule shows blood vessels across testicles… have a more linear pattern (different from ruminants, which are squiggly)

Describe the characteristics of the 4 main accessory glands in the boar…

1) Ampulla - POORLY DEVELOPED

2) Seminal vesicles (vesicular glands) - Large and lobulated, cranial extension into the abdominal cavity

3) Prostate - Small and compact; diffuse in some parts

• Difficult to see; covered by bulbourethral glands)

4) Bulbourethral glands - LARGE and extensive… covers pretty much the entire dorsal length of the pelvic urethra