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Anatomy I > Lecture 40: Comparative Penile Anatomy > Flashcards

Lecture 40: Comparative Penile Anatomy Flashcards

1
Q

penis function

A

external reproductive organ
semen delivery and urination

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2
Q

2 types of penises

A

musculocavernous penis
fibroelastic prenis

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3
Q

what type of penis do dogs/horses/cats have

A

musculocavernous

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4
Q

what type of penis do bulls/rams/bucks/boars have

A

fibroelastic

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5
Q

what do both types of penis have in common

A

fibroelastic and membranous/erectile tissue

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6
Q

musculocavernous vs fibroelastic penis

A

musculocavernous: greater content of erectile tissue, lower content of fibroelastic tissue
fibroelastic: greater content of fibroelastic tissue, lower content of erectile tissue

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7
Q

penis structure: 3 regions

A

glans
body
base

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8
Q

unique feature of fibroelastic penis

A

sigmoid flexure

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9
Q

how many cavernous bodies make up penis

A

2

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10
Q

how many spongy bodies make up penis

A

1

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11
Q

4 muscles of penis base

A

-ischiourethralis
-ischiocavernosus
-bulbospongiosis
-retractor penis

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12
Q

which muscle of penis pulls the penis backwards

A

retractor penis

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13
Q

which muscle of penis expels semen during ejaculation (+ urine)

A

bulbospongiosis

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14
Q

2 locations of fibroelastic tissue: musculocavernous penis

A

tunica albuginea and trabeculae

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15
Q

os penis

A

free floating bone in musculocavernous penis

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16
Q

cavernous bodies are eventually replaced by what structure

A

os penis

17
Q

what structure contributes to tying during mating: musculocavernous penis (dogs)

A

bulbus glandis

18
Q

musculocavernous penis in cats: specialization, function

A

keratinized glans spikes
induced ovulation by stimulus of spikes

19
Q

function of spongy body in musculocavernous penis

A

enclose urethra

20
Q

body and glans: bulls vs rams/bucks

A

bulls: urethral process attached to glans
ram/buck: urethral process not attached to glans

21
Q

blood supply to cavernous bodies

A

artery of the penis

22
Q

blood supply to spongy bodies

A

artery of the bulb

23
Q

innervation of penis

A

pudendal nerve

24
Q

blood supply to bulbus glandis

A

dorsal artery of penis

25
Q

main blood supply to penis: general arteries

A

artery of penis + branches
continuation of internal pudendal

26
Q

artery of the penis: 3 branches

A

artery of the bulb
deep artery of penis
dorsal artery of penis

27
Q

venous drainage of penis: pathway

A

bulbus glandis –> deep vein of the glans –> dorsal vein of the glans –> internal pudendal vein

28
Q

erection: musculocavernous penis

A

results from positive balance in blood flow –> higher blood filling of cavernous and spongy bodies
more blood accumulates in penis as venous drainage is interrupted

29
Q

what penile muscles are involved in erection (and what do they do)

A

proximal to base of penis: constriction by ischiourethralis and ischiocavernosus
distal to base of penis: constriction by vestibular bulb, constrictor vestibuli and constrictor vulvae

30
Q

erection: fibroelastic penis

A

stimulated by temperature
lower blood filling of cavernous and spongy bodies
extension of sigmoid flexure

31
Q

erected penis shape in bulls/boars

A

corkscrew
spiraling

32
Q

prepuce definition and function

A

musculocutaneous shield that covers and protects the penis

33
Q

what muscle protracts the prepuce in dogs

A

preputialis

34
Q

2 muscles in prepuce: bull (and what they do)

A

preputial caudalis: retractor
preputial cranialis: protractor

35
Q

specialized structure in prepuce of boar

A

preputial diverticulum

36
Q

function of preputial diverticulum in boar

A

gland –> pheromones

37
Q

blood supply of prepuce

A

external pudendal artery and vein

38
Q

3 nerves that innervate prepuce

A

pudendal
iliohypogastric
ilioinguinal

39
Q

lymphatic drainage of penis and prepuce

A

penile: superficial inguinal node
prepuce: deep inguinal node

Anatomy I (35 decks)

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