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The anus, in anatomy, is the external opening of the rectum. It is controlled by sphincter muscles. Feces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus. Most animals — from primitive worms all the way up to humans — have a tubular gut, with a mouth at one end and an anus at the other. In general, the anus is simply the exit point for matter passing through the digestive tract. Drawing of the Male Internal Sexual Anatomy From alt. ...
Drawing of the Male Internal Sexual Anatomy From alt. ...
Anatomical drawing of the human muscles from the Encyclopédie. ...
The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx. ...
From late Latin sphincter, from Greek sphinkter, band, contractile muscle, from sphingein, to bind tight. ...
Structure of a skeletal muscle Muscle is one of the four tissue types. ...
Feces (also spelled faeces or fæces) are the waste products from the digestive tract expelled through the anus during defecation. ...
Defecation or feceation (known colloquially as pooping or shitting) is the act of eliminating solid or semisolid waste material from the digestive tract. ...
The mouth, also known as the buccal cavity or the oral cavity, is the opening through which an animal or human takes in food. ...
Anatomy and function of the human anus
The human anus is situated between the buttocks, posterior to the perineum. It has two anal sphincters, one internal, the other external. These hold the anus closed until the body is ready to defecate. The buttocks are the two masses of muscle (gluteus maximus, sometimes abbreviated to glute) and fat covering the posterior aspect of the human (primate) pelvis. ...
In anatomy, the perineum is the region between the genital area and the anus in both sexes. ...
When the rectum is full the increase in intrarectal pressure forces the walls of the anal canal apart allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and peristaltic waves propel the feces out of the rectum. The internal and external sphincters of the anus allow the feces to be passed by muscles pulling the anus up over the exiting feces. The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx. ...
As the anus has a relatively high concentration of nerve endings, it is an erogenous zone, and plays a role in sexuality. For this reason (among others), Sigmund Freud's theory of psychosexual development described an "anal stage", hypothesizing that toddlers derive pleasure from retaining and expelling feces. This is the source of the (derogatory) term "anal-retentive". A nerve is an enclosed, cable-like bundle of nerve fibers or axons, which includes the glia that ensheath the axons in myelin. ...
Human sexuality is the expression of sexual feelings. ...
Sigmund Freud His famous couch Sigmund Freud (May 6, 1856 - September 23, 1939) was an Austrian neurologist and the founder of the psychoanalytic place of psychology, a movement that damaged the theory that unconscious motives control much behavior. ...
The concept of psychosexual development started with Sigmund Freud, when he developed his theories of psychoanalysis in the late 19th century and the 20th century. ...
The term anal retentive (or anally retentive) is one of a variety of examples of Freudian terminology which have found their way into common usage with a slight shift in the original meaning. ...
Anal sex main article: anal sex Roman man and youth having anal sex. ...
Anal sex can be pleasurable for both the insertive partner and the receptive partner. The anus contains many of the same kinds of nerves as the penis or clitoris. For females, pleasure derived from anal intercourse is also thought to be related to the shared wall between the rectum and the vagina as well as the G-spot. For males, the tightness of the anus is often said to be a source of pleasure in penetrative anal sex, while the presence of the prostate gland near the rectal wall is generally seen as a source of pleasure during receptive anal intercourse. Roman man and youth having anal sex. ...
The penis (plural penises or penes) or phallus is the external male copulatory organ, and, in mammals, the external male organ of urination. ...
A womans clitoris extends from the visible portion to a point below the pubic bone. ...
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Male Anatomy The prostate is a gland that is part of male mammalian sex organs. ...
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