Lecture 29: Accessory Repro. Glands and the Penis

Ampullary Glands

enlarged portion of deferent ducts

wall of duct enlarged w/ glandular tissue(lumen itself is not enlarged)

sits near/on top of bladder

shares duct w/ vesicular gland

Boars and Toms

which anis. DO NOT have ampullae?

Vesicular glands

lateral to def. ducts, share duct w/ ampullae

smooth in the horse, knobby & thick-walled in other spec.

Dogs and Toms

What spec. DO NOT have vesicular glands?

Prostate Gland

Single, but w/ 2 parts

one part spread through urethra wall

other covering urethra on the outside

some have both parts(dog, tom), others have one

Bulbourethral glands

paired, dorsal to urethra

most distal gland

Dog

what spec. DOES NOT have bulbourethral glands?

Prepuce

aka sheath

invagination of abdominal skin where penis lies when it is not sexually active

external and internal layers

lamina externa

“external” layer of prepuce

red

haired, cont. w/ external integument

lamina interna

“internal” layer of prepuce

blue

reflects back on itself and faces free end of penis

physiological method of erection

the two types of penises differ based on the ….

Musculocavernous Penis

carns+stallions

erection= engorgement of erectile tissue w/ blood

both diameter and length of penis increase

penis flaccid when not in use

little conn. tissue

Fibroelastic Penis, Sigmoid Flexure

boars and rums.

lots of fibroelastic tissue, less open space for blood

penis firm when not in use

erection occurs w/ external lengthening of penis by straightening of……

Os Penis

bone, disconnected from skeleton

in felines and canines

dorsal to urethra in penile tissue

provides support and rigidity

5

root

1

body

2

glans

3

Corpus Spongiosum

yellow

directly encloses urethra

allows it to remain patent when tissue is engorged

forms bulb of glans of penis

Corpus Cavernosum

blue

paired erectile tissue that makes up most of body of penis

more fibrous, tapers off at glans

Tunica albuginea

tough outer casing that cover corpus cavernosum

Hint: you’ve heard this term before, relating to the testes!!

Retractor Penis Muscle

blue

muscle respon. for retracting penis back into abdom. and prepuce

Urethral process

externsion of urethra beyond glans

Boar

note corkscrew shape

Tom

note barbed glans

Ram/Buck

note long urethral process

Dog

Bull

Stallion

note small differentiation that urethral process makes