Penis, the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. The corresponding structure in lower invertebrates is often called the cirrus.
Britannica Quiz
The Human Body
Which of these glands produces tears?
The human penis is anatomically divided into two continuous areasthe body, or external portion, and the root. The root of the penis begins directly below the bulbourethral glands with a long cylindrical body of tissue known as the corpus spongiosum (or corpus cavernosum urethrae). This tissue extends through the body of the penis to the tip, where it expands into a mushroom-shaped structure called the glans penis. Running through the centre of the corpus spongiosum is the urethra, a common passage for semen and urine; the urethra ends in a slitlike opening at the tip of the glans penis. Beginning alongside of the bulbourethral glands are a pair of long cylindrical bodies called the corpora cavernosa penis. These continue through the body of the penis, occupying the sides and upper portion directly above the corpus spongiosum; they terminate immediately before the glans penis.
The corpora cavernosa consist of empty spaces divided by partitions of tissue. The tissue consists of muscle, collagen (a fibrous protein), and elastic fibre. The corpora cavernosa are termed erectile tissue (see erection), because during sexual excitation, their fibrous tissue is expanded by blood that flows into and fills their empty spaces. The blood is temporarily trapped in the penis by the constriction of blood vessels that would normally allow it to flow out. The penis becomes enlarged, hardened, and erect as a result of this increased blood pressure. The corpus spongiosum is also considered erectile tissue. This area, however, does not become as enlarged as the other two during erection, for it contains more fibrous tissue and less space; unlike the corpora cavernosa, the corpus spongiosum has a constant blood flow during erection.
The corpora cavernosa and corpus spongiosum are enclosed by a circular layer of elastic tissue. This in turn is covered by a thin layer of skin. The skin, which is slightly darker in colour than the rest of the body, is loose and folded while the penis is in a flaccid state. At the beginning of the glans penis, a circular fold of skin, commonly called the foreskin (or prepuce), extends forward to cover the glans. At birth or during early childhood, the foreskin may be removed by an operation called circumcision.
In humans, the penis may be affected by various developmental abnormalities, diseases, or injury. Severe anomalies of the penis are rare; examples are the absence, torsion (twisting), and duplication of the penis. Other anomalies include an abnormally large penis, which typically is associated with precocious puberty, dwarfism, or an overactive pituitary, and a small penis, which may be associated with infantilism or undersecretion of the pituitary or pineal gland. Balanitis, or inflammation of the glans penis, and posthitis, or infection of the foreskin, result from the retention of secretions and bacteria beneath the foreskin and can be prevented with proper hygiene. Tumours of the penis are almost all of epithelial (covering or lining) origin and usually involve the foreskin (prepuce) or glans; penile cancer is infrequent among men who were circumcised during infancy.
See the original post here:
penis | Description, Anatomy, & Physiology | Britannica
- Anatomy of the Phillips curve - CEPR - June 10th, 2025 [June 10th, 2025]
- Don't Expect Arizona To Return To Grey's Anatomy Anytime Soon After This Exciting Jessica Capshaw Update - Screen Rant - June 10th, 2025 [June 10th, 2025]
- Pacers vs. Thunder NBA Finals: Anatomy of a comeback How the Pacers once again did the unthinkable - Yahoo Sports - June 10th, 2025 [June 10th, 2025]
- Anatomy Of A Debacle: How Mayor Adams Went From Visionary to Bully on E-Bikes - Streetsblog New York City - June 10th, 2025 [June 10th, 2025]
- Anatomy of an At-Bat: How Matt Wallner Conquered Kevin Gausman - Twins Daily - June 10th, 2025 [June 10th, 2025]
- Enhancing anatomy education with virtual reality: integrating three-dimensional models for improved learning efficiency and student satisfaction -... - June 10th, 2025 [June 10th, 2025]
- Greys Anatomy Season 22 Cast Updates: Just Two Actors Confirmed After Shocking Finale, Though 7 More Stars Have Deals to Return - Just Jared - June 10th, 2025 [June 10th, 2025]
- S11E20: 5 Things You Should Know About Tactical Anatomy With Steve Moses - concealedcarry.com - June 10th, 2025 [June 10th, 2025]
- Airport security held Greys Anatomy star for an hour over snack - Yahoo - June 10th, 2025 [June 10th, 2025]
- Wine Walk: The anatomy of a wine bottle, its cork and how it is sealed - The Courier of Montgomery County - June 10th, 2025 [June 10th, 2025]
- MSc grad reflects on learning and legacy in the anatomy lab - Schulich School of Medicine & Dentistry - June 10th, 2025 [June 10th, 2025]
- Greys Anatomy star Ellen Pompeo says TSA detained her over sunflower seeds - Washington Times - June 10th, 2025 [June 10th, 2025]
- Cardiac Anatomy & Orientation of the 3D Heart Part 3 - University of Nebraska Medical Center - June 1st, 2025 [June 1st, 2025]
- Greys Anatomy Star Chris Carmack Teases Link and Jos Season 22 Storyline: Anything Can Happen - Life & Style - June 1st, 2025 [June 1st, 2025]
- Greys Anatomy Star Reveals Her Secret to Flying Under the Radar on Planes - EntertainmentNow - June 1st, 2025 [June 1st, 2025]
- None of her preserved anatomy looked like any other fossil. Scientists Realize That A Fossil Thats Millions Of Years Old Was Fossilized From The... - June 1st, 2025 [June 1st, 2025]
- Greys Anatomy star is fighting to get Denzel Washington on the show: 'Im hoping he does it' - GeekSided - June 1st, 2025 [June 1st, 2025]
- No, Sandra Oh is not watching Greys Anatomy in her free time - GeekSided - June 1st, 2025 [June 1st, 2025]
- Brigitte and Emmanuel Macron the anatomy of a slap - The Spectator World - June 1st, 2025 [June 1st, 2025]
- Sandra Oh Reveals If She Watches Grey's Anatomy Reruns 11 Years Since Cristina Yang Left The Show - Screen Rant - June 1st, 2025 [June 1st, 2025]
- Fan-Favorite Greys Anatomy Star Sandra Oh Reveals Whether She Still Watches the Show or Not - Collider - June 1st, 2025 [June 1st, 2025]
- Greys Anatomy: Why Did Sandra Oh Leave The Show? Revisiting Her Shocking Exit & Remarkable Legacy - Koimoi - June 1st, 2025 [June 1st, 2025]
- Warfare at night, deepfakes by day: The anatomy of a rumour in modern era conflicts - The Indian Express - June 1st, 2025 [June 1st, 2025]
- Greys Anatomy Hunk, 59, Turns Heads in Rare Monaco Outing With Wife - parade.com - June 1st, 2025 [June 1st, 2025]
- Grey's Anatomy season 22 confirmed to premiere in fall 2025 - GeekSided - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy season 21 finale: Where to watch for free tonight - MassLive - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Showrunner Meg Marinis Confirms Your Fears After That Explosive Cliffhanger Finale - The Hollywood Reporter - May 21st, 2025 [May 21st, 2025]
- 'Grey's Anatomy' Recap: Did Firebomb Just Kill Off Lucas Adams, Teddy Altman, or Miranda Bailey? - TV Insider - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy season 22 will not introduce any major new additions: 'I have a big enough cast as it is' - GeekSided - May 21st, 2025 [May 21st, 2025]
- 8 Biggest Unanswered Questions & Mysteries After The Grey's Anatomy Season 21 Finale - Screen Rant - May 21st, 2025 [May 21st, 2025]
- Only 2 Grey's Anatomy characters are confirmed to be safe in season 22 - GeekSided - May 21st, 2025 [May 21st, 2025]
- 'Grey's Anatomy': Meredith Puts Herself in Harm's Way Once Again as a Hostage Situation Leaves Grey Sloan Reeling - People.com - May 21st, 2025 [May 21st, 2025]
- This Greys Anatomy character death still remains the shows most gut-wrenching - GeekSided - May 21st, 2025 [May 21st, 2025]
- Anatomy Of A Perfect Trip Cybercaf Across The Algarve - Quartersnacks - May 21st, 2025 [May 21st, 2025]
- Why the Greys Anatomy Hospital Is Facing Another Bomb Threat in Season 21 Finale - E! Online - May 21st, 2025 [May 21st, 2025]
- Streaming Set Another Record In April, But Greys Anatomy And The White Lotus Prove Linears Reach, Nielsen Says - Deadline - May 21st, 2025 [May 21st, 2025]
- 'Grey's Anatomy' Boss Answers the Biggest Questions From That Explosive Season Finale (Exclusive) - parade.com - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Season-Finale Recap: Explosions in the Sky - Vulture - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Boss Breaks Down That Explosive Season 21 Finale Cliffhanger, Merediths Surprising Decision - TheWrap - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy boss confirms one new star will return in season 22 - GeekSided - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Season 21 Finale Review: I Cant Believe The Show Pulled Off This Cliffhanger Reminiscent Of Its Glory Days - Screen Rant - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy Finale Preview: Chris Carmack Teases 'Be Afraid' - Us Weekly - May 21st, 2025 [May 21st, 2025]
- ABC NEWS STUDIOS ANNOUNCES HEY BEAUTIFUL: ANATOMY OF A ROMANCE SCAM BEGINS STREAMING MAY 20, ONLY ON HULU - dgepress.com - May 21st, 2025 [May 21st, 2025]
- 5 Grey's Anatomy characters who might not return for season 22 after that fiery cliffhanger - GeekSided - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Explosion & Possible Character Deaths: Showrunner Explains Why Shes Doing This to Link & Jo - Just Jared - May 21st, 2025 [May 21st, 2025]
- 'Grey's Anatomy' season 21 ending explained: Is Meredith returning to Grey Sloan for good? - Entertainment Weekly - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy Season 21 Finally Resolved Its Most Frustrating Plot In Limbo - Screen Rant - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy Season 21 Ending Explained: Amelia Survives A Near-Death Experience While Tragedy Strikes A Fan-Favorite - Screen Rant - May 21st, 2025 [May 21st, 2025]
- James Pickens Jr. Says Every Day Is an Adventure on 'Greys Anatomy' (Exclusive) - People.com - May 21st, 2025 [May 21st, 2025]
- The Doctor Is Out: Greys Anatomy Ends Season 21 With a Devastating Death - Yahoo - May 21st, 2025 [May 21st, 2025]
- Greys Anatomy Season 22 Cast: Only 2 Characters Confirmed Alive After Finale, Though 7 More Actors Have Deals to Return - Just Jared - May 21st, 2025 [May 21st, 2025]
- 'Grey's Anatomy' Interview: James Pickens Jr. Reflects on Pilot and Reveals Season 22 Hopes (Exclusive) - TV Insider - May 21st, 2025 [May 21st, 2025]
- Grey's Anatomy tells fans to "brace yourself" for season finale that's as dramatic as this iconic episode - Digital Spy - May 21st, 2025 [May 21st, 2025]
- I Can't Believe Grey's Anatomy Still Hasn't Told Us Who Adams' Mother Is - Cinemablend - May 21st, 2025 [May 21st, 2025]
- Katherine Heigl Shares Why She's Grateful Her Daughters Aren't Interested in Grey's Anatomy (Exclusive) - parade.com - May 12th, 2025 [May 12th, 2025]
- 'Grey's Anatomy' Fans Are Just Realizing This Fun Fact About the Series That Affects All but 1 Episode - People.com - May 12th, 2025 [May 12th, 2025]
- In a Nutshell: Turning anatomy education into online sensation - Ohio University - May 12th, 2025 [May 12th, 2025]
- 'Grey's Anatomy' Gets Musical Again: Link Serenades Jo With Song at the Wedding Altar - TV Insider - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy Boss Unpacks Jo and Links Momentous Wedding Song, Teases Bonkers Season 21 Finale - TheWrap - May 12th, 2025 [May 12th, 2025]
- Generating cervical anatomy labels using a deep ensemble multi-class segmentation model applied to transvaginal ultrasound images - Nature - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy creator Shonda Rhimes reveals the hardest death she had to write - Yahoo - May 12th, 2025 [May 12th, 2025]
- Katherine Heigl Reveals What 1 Medical Trick She Thinks She Could Still Do After Grey's Anatomy (Exclusive) - parade.com - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy Season 21, Episode 17 Review: As A Long-Time Fan, I Loved This Romantic & Poignant Episode That Felt Like Classic Greys - Screen... - May 12th, 2025 [May 12th, 2025]
- As One Greys Anatomy Couple Weds, Another Breaks Up and a Third Relationship Lands on Life Support - TVLine - May 12th, 2025 [May 12th, 2025]
- Every Wedding on Greys Anatomy , Ranked - Vulture - May 12th, 2025 [May 12th, 2025]
- 'Greys Anatomy': Link Surprises Jo at Their Wedding, Owen Holds onto the Past and 1 Couple Calls It Quits - People.com - May 12th, 2025 [May 12th, 2025]
- Here comes the bride: Where to stream Greys Anatomy for FREE - PennLive.com - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy Preview: Will Link and Jo I Do It Right On Their Wedding Day? Plus, [Spoiler]s Back - TVLine - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy boss reveals the disappointing reason Meredith missed Jo and Links wedding - GeekSided - May 12th, 2025 [May 12th, 2025]
- Anatomy Of Startup Governance Issues, Funding Zooms & More - StartupNews.fyi - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy Shock: Lucas and Simone Split Will Fans Even Miss Them? - Decatur Metro - May 12th, 2025 [May 12th, 2025]
- 9 Secrets of the Greys Anatomy Sets Superfans Need to Know - Architectural Digest - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy Continues to Ignore a Key Character's Storyline (& It's Frustrating Fans) - Comic Book Resources - May 12th, 2025 [May 12th, 2025]
- Jo & Link's Unique Wedding Set-Up Is Exactly Why Their Romance Works In Grey's Anatomy - Screen Rant - May 12th, 2025 [May 12th, 2025]
- Greys Anatomy creator Shonda Rhimes reveals the hardest death she had to write - The Independent - May 12th, 2025 [May 12th, 2025]
- Grey's Anatomy fans are just realizing clever aspect of 'every episode' after 20 years - The Mirror US - May 12th, 2025 [May 12th, 2025]
- Did the Success of The Substance and Anatomy of a Fall Finally Teach Cannes a Lesson? - IndieWire - May 12th, 2025 [May 12th, 2025]
- Grey's Anatomy fans floored after spotting 'hidden message' in every episode - Irish Star - May 12th, 2025 [May 12th, 2025]
- Anatomy of an apprehension: Where are you taking the baby? - Maple Ridge-Pitt Meadows News - May 12th, 2025 [May 12th, 2025]
- Isaiah Washington Says Sandra Oh Brought Him Back on Greys Anatomy Years After Firing - E! Online - April 27th, 2025 [April 27th, 2025]