Comparative

anatomy

Buffalo-bull

Ram & Buck

Stallion

External tube

Internal tube

Classification of the penis

Fibroelastic Musclocavernous

•Major tissue

• Increase in diameter and

length after erection

•Increase in rigidity after erection

•Time for full erection

•Presence of segmoid flexure

•Species

•Texture in non erected state Fibroelastic Cavernous

Minor Great increase

Short Long

Present Absent

Bull, Buffalo-bull, Ram,

Buck, Camel-bull, Boar

Stallion, Tom-cat,

Dog

Firm Soft compressible

Minor Huge increase .

•Major tissue

•Texture in non erected state

• Increase in diameter and

length after erection

•Major tissue

•Texture in non erected state

•Increase in rigidity after erection

• Increase in diameter and

length after erection

•Major tissue

•Texture in non erected state

•Time for full erection

•Increase in rigidity after erection

• Increase in diameter and

length after erection

•Major tissue

•Texture in non erected state

•Presence of segmoid flexure

•Time for full erection

•Increase in rigidity after erection

• Increase in diameter and

length after erection

•Major tissue

•Texture in non erected state

•Presence of segmoid flexure

•Time for full erection

•Presence of segmoid flexure

•Increase in rigidity after erection

•Time for full erection

•Presence of segmoid flexure

• Increase in diameter and

length after erection

•Increase in rigidity after erection

•Time for full erection

•Presence of segmoid flexure

•Texture in non erected state

• Increase in diameter and

length after erection

•Increase in rigidity after erection

•Time for full erection

•Presence of segmoid flexure

•Major tissue

•Texture in non erected state

• Increase in diameter and

length after erection

•Increase in rigidity after erection

•Time for full erection

•Presence of segmoid flexure

Camel

Boar

Dog

Dog

Tom-cat

Tom-cat

Shape, dimensions and weight of testis

Species Shape Dimensions Weight

Average % body weight

Bull Oval 10-15 x 6-8 200-500 (300) 0.03

Ram, Buck Oval 8-12 x 4-7 200-400 (250) 0.3

Stallion Oval, com.

side / side 8-12 x 6-7 x 5 200-300 (200) 0.03

Boar Oval 10-15 x 5-9 500-800 (600) 0.2

Camel-bull Banana 9 x 5 100

Dog Oval 2-4 x1.5-2.5 7-15

Tom-cat Oval 1.2-2 x 0.5-1.5

Orientation

0.2

vertical

oblique

horozontical

oblique

oblique

vertical

oblique

Penis

GlansErectile

TissueType

Sigmoid

FlexureSpecies

GLANS+FEYESbull

GLANS+FEYESram

NOT DISTINCT+FEYESboar

LARGE GLANS+++MVNOstallion

LARGE GLANS+++MVNOdog

LARGE GLANS +

SPINES+++MVNOcat

LARGE GLANS+++MVNOhuman

Erection and Ejaculate Characteristics

Sperm

Numb

er

Sperm

Concentration

Semen

Volume

Ejaculate

Time

Speed of

Erecti

on

Species

mediummedium-highmediumshortrapidbull

mediumhighsmallshortrapidram

highlowlargelongrapidboar

mediumlowlargemoderateslowstallion

lowlowlargelongslowdog

lowhighsmallmoderateslowcat

lowlowmediummoderateslowhuman

Accessory Glands

Species Seminal Prostate Cowper's

Vesicles body disseminate

Bull ++ + + +

Ram + - + ++

Stallion +++ ++ - +

Camel - + + +

Boar +++ + + +++

Dog - ++ - -

Tom-Cat - ++ - +

Accessory Glands Secretions (% of the ejaculate)

Cowper'sProstate

Body + Disseminate

Seminal Vesicles

Species

630bull

68ram

304030boar

30stallion

70dog

2570human