A report on Penis and Glans penis

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.

The male anatomy showing the location of the glans penis

External male genitalia of a Labrador Retriever

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

Penises of minke whales on display at the Icelandic Phallological Museum

Genitorinary system of a raccoon (Procyon lotor)

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

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

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

- Glans penis

Glans: the free end of the penis.

- Penis

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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.

Generally, in uncircumcised males, the foreskin automatically and gradually retracts, exposing the glans, though some people may have to manually retract their foreskin.

A corpus cavernosum penis (singular) (literally "cave-like body" of the penis, plural corpora cavernosa) is one of a pair of sponge-like regions of erectile tissue, which contain most of the blood in the penis during an erection.

The male anatomy has no vestibular bulbs, but instead a corpus spongiosum, a smaller region along the bottom of the penis, which contains the urethra and forms the glans penis.

A flaccid penis, with surrounding pubic hair removed to show anatomical detail

Human penis

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External male intromittent organ that additionally serves as the urinal duct.

Stages in the development of the male external genitalia

A urinating puer mingens by Annibale Carracci, 1600, Palazzo Farnese

The development of a penile erection, also showing the foreskin gradually retracting over the glans.
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A ventral view of a penis flaccid (left) and erect (middle); a dorsal view of a penis erect (right).

Papuan man wearing traditional penis sheath

A labelled dorsal view of a circumcised penis: (1) Shaft, (2) Circumcision scar, (3) Corona, (4) Glans, (5) Meatus.

Dissection showing the fascia of the penis as well as several surrounding structures

Image showing innervation and blood-supply of the human male external genitalia

The main parts are the root (radix); the body (corpus); and the epithelium of the penis including the shaft skin and the foreskin (prepuce) covering the glans penis.

Clitoris

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Female sex organ present in mammals, ostriches and a limited number of other animals.

Stages in the development of the clitoris

Created by Helen O'Connell using MRI, the first 3D image of a clitoris in an erect state with the adjacent organs of the uterus and urinary bladder

A partially exposed clitoral glans, which can't be fully exposed due to a mild case of adhesions to the clitoral hood

Structures of the vulva, including external and internal parts of the clitoris

The clitoral hood has a normal anatomical variation in size and appearance in different adult women: while it is completely covered by the labia majora in some women, standing with their legs closed, in others it is pronounced and clearly visible.

Clitoral hood (1) and clitoris (2). Labia are spread apart on the bottom image.

An enlarged clitoris due to clitoromegaly

A Georg Ludwig Kobelt illustration of the anatomy of the clitoris

Girl protesting for clitoris-awareness at a women's rights rally in Paris, 2019

With a urogenital system in which the female urinates, mates and gives birth via an enlarged, erectile clitoris, female spotted hyenas are the only female mammals devoid of an external vaginal opening.

Male and female reproductive systems of the spotted hyena, from Schmotzer & Zimmerman, Anatomischer Anzeiger (1922). Abb. 1 (Fig. 1.) Male reproductive anatomy. Abb. 2 (Fig. 2.) Female reproductive anatomy. Principal abbreviations (from Schmotzer & Zimmerman) are: T, testis; Vd, vas deferens; BU, urethral bulb; Ur, urethra; R, rectum; P, penis; S, scrotum; O, ovary; FT, tuba Fallopii; RL, ligament uteri; Ut, uterus; CC, Corpus clitoris. Remaining abbreviations, in alphabetical order, are: AG, parotid analis; B, vesica urinaria; CG, parotid Cowperi; CP, Corpus penis; CS, corpus spongiosum; GC, glans; GP, glans penis; LA, levator ani muscle; Pr, prepuce; RC, musculus retractor clitoris; RP, Musculus retractor penis; UCG, Canalis urogenital.

Unlike the penis, the male homologue (equivalent) to the clitoris, it usually does not contain the distal portion (or opening) of the urethra and is therefore not used for urination.

She argued that "the male clitoris" is directly beneath the rim of the glans penis, where the frenulum of prepuce of the penis (a fold of the prepuce) is located, and proposed that this area be called the "Lownde's crown".

Stallion

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Male horse that has not been gelded .

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

Stallion exhibiting the flehmen response

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.

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

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

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.

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.

Lower Parts of the Genital and Urinary Tracts in the Male

Corpus spongiosum (penis)

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The penis in transverse section, showing the blood vessels.

Vertical section of bladder, penis, and urethra.

The constituent cavernous cylinders of the penis.

Medical ultrasonography of a normal penis.

The corpus spongiosum is the mass of spongy tissue surrounding the male urethra within the penis.

This expansion, termed the glans penis, is moulded on the rounded ends of the corpus cavernosum penis, extending farther on their upper than on their lower surfaces.