A report on Stallion and Penis

Mustang stallion (right) with part of his band of mares and foals

Females have corkscrew vaginas with many blind pockets designed for difficult penetration and to prevent becoming pregnant. This reduced the likelihood of fertilization by unwanted aggressors in favor of fitter mates.

Stallion exhibiting the flehmen response

External male genitalia of a Labrador Retriever

Penises of minke whales on display at the Icelandic Phallological Museum

A stallion's secondary characteristics include heavier muscling for a given breed than is seen in mares or geldings, often with considerable development along the crest of the neck, as shown in this image.

Genitorinary system of a raccoon (Procyon lotor)

Even well-trained stallions require firm and consistent handling by experienced individuals.

Penis of a human, with pubic hair removed to show anatomical detail

Aggressive and even violent behavior between stallions not habitually living together or in the presence of mares adds to the challenges in stallion management.

The spine-covered penis of Callosobruchus analis, a bean weevil

Provided with sufficient space and food with no distractions from mares in estrus, even stallions previously used for breeding may coexist peacefully. Not all individuals are suited for this kind of arrangement, however.

Stallions are capable of achieving a high level of discipline and training.

A bone called the baculum or os penis is present in most mammals but absent in humans, cattle and horses.

- Penis

the penis, within the "penile sheath". Stallions have a vascular penis. When non-erect, it is quite flaccid and contained within the sheath. The retractor penis muscle is relatively underdeveloped. Erection and protrusion take place gradually, by the increasing tumescence of the erectile vascular tissue in the corpus cavernosum penis. When not erect, the penis is housed within the prepuce, 50 cm long and 2.5 to 6 cm in diameter with the distal end 15 to 20 cm. The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath. When erect, the penis doubles in length and thickness and the glans increases by 3 to 4 times. The urethra opens within the urethral fossa, a small pouch at the distal end of the glans. A structure called the urethral process projects beyond the glans.

- Stallion

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Three columns of erectile tissue make up most of the volume of the penis.

Erection

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Various erection angle and shape of penises.

An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged.

When not erect, a horse's penis is housed within the prepuce, 50 cm long and 2.5 to 6 cm in diameter with the distal end 15 to 20 cm. The retractor muscle contracts to retract the penis into the sheath and relaxes to allow the penis to extend from the sheath.

Penile sheath

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Penile sheath of a Chihuahua with Cryptorchidism

Almost all mammal penises have foreskins or prepuce, although in non-human cases the foreskin is usually a sheath (sometimes called the preputial sheath, praeputium or penile sheath ) into which the whole penis is retracted.

In stallions, the retractor penis muscle contracts to retract the stallion's penis into the sheath and relaxes to allow the penis to extend from the sheath.

Ejaculation

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Discharge of semen from the male reproductory tract as a result of an orgasm.

Diagram of the male pelvic and reproductive organs

A usual precursor to ejaculation is the sexual arousal of the male, leading to the erection of the penis, though not every arousal nor erection leads to ejaculation.

In stallions, ejaculation is accompanied by a motion of the tail known as "tail flagging".

Retractor muscle of the penis

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In some animals the male penis possesses a muscle enabling retraction into the prepuce.

In stallions, the retractor penis muscle is relatively underdeveloped.

Glans penis

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Bulbous structure at the distal end of the human penis that is the most sensitive erogenous zone and primary anatomical source of male sexual pleasure.

The male anatomy showing the location of the glans penis

Internal anatomy of human glans penis: 1. Fascia penis 2. Corpus cavernosum 3. Coronal sulcus 4. Corona of glans 5. Foreskin 6. Glans penis 7. Meatus of the urethra 8. Navicular fossa of male urethra 9. Tunica albuginea of penis 10. Corpus spongiosum 11. Urethra

In comparison, the glans of felids is short and spiny, while that of viverrids is smooth and long.

When erect, the glans of a horse's penis increases by 3 to 4 times.