A report on Penis and Urination

Mallard pseudo-penis
Manneken Pis depicts a urinating boy (puer mingens).
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 interior of the bladder
External male genitalia of a Labrador Retriever
Male dog using urine to mark a spot with his scent.
Penises of minke whales on display at the Icelandic Phallological Museum
Urinating woman
Genitorinary system of a raccoon (Procyon lotor)
Urinating man
Penis of a human, with pubic hair removed to show anatomical detail
Painting showing the physician Constantine the African accepting urine samples for diagnosis
The spine-covered penis of Callosobruchus analis, a bean weevil
Location of external urethral orifice in adult human male
Location of the bladder and urethra in adult human female (sagittal section)
Woodcut of a puer mingens, from the Hypnerotomachia Poliphili, 1499
Public toilet outside the Philadelphia City Hall
Indecency, 1799 by Cruikshank
Woman Urinating, etching, Rembrandt van Rijn, 1631
A man uses a urinal while urinating in a standing position.
Body position taken by a woman for urination into many female urinals: floating half squat or "skier position".
Urination in Greek antique art: Hetaera urinating into a skyphos
A horse urinating while in formation with the Queens Guards
A maned wolf urinating on a tree to mark his territory
A cheetah marking a tree with urine
Jeanneke Pis

In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female, but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation.

- Penis

In placental mammals, urine is drained through the urinary meatus, a urethral opening in the male penis or female vulval vestibule.

- Urination
Mallard pseudo-penis

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Overall

The urethra transports urine from the bladder to the outside of the body. This image shows (a) a female urethra and (b) a male urethra.

Urethra

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Tube that connects the urinary bladder to the urinary meatus for the removal of urine from the body of both females and males.

Tube that connects the urinary bladder to the urinary meatus for the removal of urine from the body of both females and males.

The urethra transports urine from the bladder to the outside of the body. This image shows (a) a female urethra and (b) a male urethra.
The human male urethra laid open on its anterior (upper) surface
Micrograph of urethral cancer (urothelial cell carcinoma), a rare problem of the urethra.
Position of the urethra in males
Transverse section of the penis
Male urethral opening on glans penis
Female urethral opening within vulval vestibule
Muscles of the female perineum
Urethra. Deep dissection. Serial cross section.
Diagram which depicts the membranous urethra and the spongy urethra of a male

The external urethral sphincter is a striated muscle that allows voluntary control over urination.

Its length differs between the sexes, because it passes through the penis in males.

1. Human urinary system: 2. Kidney, 3. Renal pelvis, 4. Ureter, 5. Urinary bladder, 6. Urethra. (Left side with frontal section)
7. Adrenal gland
Vessels: 8. Renal artery and vein, 9. Inferior vena cava, 10. Abdominal aorta, 11. Common iliac artery and vein
Transparent: 12. Liver, 13. Large intestine, 14. Pelvis

Urinary system

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The urinary system, also known as the urinary tract or renal system, consists of the kidneys, ureters, bladder, and the urethra.

The urinary system, also known as the urinary tract or renal system, consists of the kidneys, ureters, bladder, and the urethra.

1. Human urinary system: 2. Kidney, 3. Renal pelvis, 4. Ureter, 5. Urinary bladder, 6. Urethra. (Left side with frontal section)
7. Adrenal gland
Vessels: 8. Renal artery and vein, 9. Inferior vena cava, 10. Abdominal aorta, 11. Common iliac artery and vein
Transparent: 12. Liver, 13. Large intestine, 14. Pelvis

Following filtration of blood and further processing, wastes (in the form of urine) exit the kidney via the ureters, tubes made of smooth muscle fibres that propel urine towards the urinary bladder, where it is stored and subsequently expelled from the body by urination (voiding).

In placental mammals the male ejects urine through the penis, and the female through the vulva.

Vulvas of different women (pubic hair removed in some cases)

Vulva

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The vulva (plural: vulvas or vulvae; derived from Latin for wrapper or covering) consists of the external female sex organs.

The vulva (plural: vulvas or vulvae; derived from Latin for wrapper or covering) consists of the external female sex organs.

Vulvas of different women (pubic hair removed in some cases)
Labeled image of a vulva, showing external and internal views
Vulva with visible parts of the clitoris and the parts lying under the skin
Muscles underlying the vulva and perineum
The length of the labia minora varies significantly between women: while the labia majora completely enclose the labia minora in some women (top row), in other women they protrude and are clearly visible in upright standing position (bottom row). Colloquially, these variations of the labia are also referred to as "innies" and "outies".
Genital tubercle of female at fourteen weeks
Development of genitals showing homologues from indifferent at A to both sexes - female on right
Development of genitals showing homologues from indifferent to both sexes
Non-aroused vulva on the left and a sexually aroused vulva on the right with enlarged and shiny labia minora from vaginal lubrication and vasocongestion
Water warts of molluscum contagiosum
Pubic hair with crab lice
The Labia pride movement resents the ideals of female cosmetic genital surgeries: The Muff March in London, 2011
Female genital piercings include the Nefertiti piercing central and the Christina piercing pictured on either side
Derived from traditional symbols, Hanabira scarification is intended to decorate the pubic area
A gynaecological examination being carried out in 1822
Japanese artist Megumi Igarashi with vulva portrayal
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Glans clitoris with small distance to the opening
Glans clitoris with medium distance to the opening
Lack of contact of the clitoral glans with the penis
Contact of the clitoral glans with the penis with small CUMD
Classification of the 200 women into CUMD categories
Selection of women studied and interviewed
Vulva handsign used as a yogic mudra
Attic red-figure lid. Three female organs and a winged phallus.
Yoni at Mahadev temple
Glans clitoris with medium distance to the opening

The clitoris is the homologue of the penis, and the clitoral hood is the female equivalent of the male foreskin, and may be partially or completely hidden within the pudendal cleft.

Pelvic pain might also occur especially during urinating and sex.

Penile sheath of a Great Dane

Penile sheath

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Penile sheath of a Great Dane
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 rodents, the length of the prepuce is related to urine marking behavior.

Human glans penis (dorsal view)

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.

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.

Human glans penis (dorsal view)
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

Male felids are able to urinate backwards by curving the tip of the glans penis backward.

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