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Chapter 5

Chapter 5 - Male Sexual Anatomy and Physiology

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Department
Psychology
Course
PSY3122
Professor
Peggy Kleinplatz
Semester
Fall

Description
Chapter 5 – Male Sexual Anatomy and Physiology SEXUAL ANATOMY The penis: a male sexual organ consisting if the internal root and the external shaft and glans - Consists of nerves, blood vessels, fibrous tissue and 3 parallel cylinders of spongy tissue - Extensive network of muscles present at the base of the penis – these muscles eject semen and urine through the urethra - Root: the portion of the penis that extends internally into the pelvic cavity - Shaft: the length of the penis between the glans and the body - Glans: the head of the penis; it is richly endowed with nerve endings - Three cylinders: o 2 larger ones: cavernous bodies: the structures in the shaft of the penis that engorge with blood during sexual arousal o Third layer: spongy body: a cylinder that forms a bulb at the base of the penis, extends up into the penile shaft, and forms the penile glans o At the root of the penis the innermost tips of the cavernous bodies, or crura, are connected to the pubic bones - Skin covering the penile shaft is usually hairless and quite loose – allows for expansion when the penis becomes erect - Foreskin: a covering of skin over the penile glans – or prepuce o Circumcision: involves the surgical removal of the sleeve of skin covering the whole penis o Superincision: foreskin is split lengthwise along its top portion, instead of being removed o Castration: removal of the testes - Entire penis sensitive to touch – but greatest concentration of nerve endings is found in the glans o 2 specific locations are particularly responsive to stimulation  Corona: the rim, or crown – which marks the area where the glans rises abruptly from the shaft  Frenulum: a highly sensitive thin strip of skin that connects the glans to the shaft on the underside of the penis The Scrotum: the pouch of skin of the external male genitals that encloses the testes - Scrotal sac: consists of 2 layers: o Outermost layer: a covering of thing skin that is darker in colour that other body skin – becomes sparsely covered with hair at adolescence o Second layer: tunica dartos: composed of smooth muscle fibers and fibrous connective tissue - Within the scrotal sac – 2 separate compartments o Each houses a testicle – male gonad inside the scrotum that produces sperm and sex hormones o Each testis is suspended in its compartment by the spermatic cord: a cord attached to the testicle that contains the vas deferences, blood vessels, nerves and cremasteric muscle fibers - Cremasteric reflex: contractions of the cremasteric muscle (major scrotal muscle) The Testes - 2 major functions o The secretion of sex hormones o The production of sperm - Form inside the abdominal cavity and migrate through the inguinal canal from the abdomen to the scrotum in late fetal development - Cryptorchidism: a condition in which the testes fail to descent from the abdominal cavity to the scrotal sac The Seminiferous Tubules - Within the testes are 2 separate areas involved in the production and storage of sperm o Seminiferous tubules: thin, coiled structures in the testes in which sperm are produced – make up the interior of the testis o Interstitial cells (Leydig’s cell): cells located between the seminiferous tubules that are the major source of androgen in males – proximity to blood vessels allows direct secretion of their hormone products into the bloodstream The Epididymis: the structure along the back of each testis in which sperm maturation occurs – sperms produced in the seminiferous tubules move into this structure The Vas Deferens - Sperm held in the epididymis drain into the vas deferens o Vas deferens: a sperm carrying tube that begins at the testis and ends at the urethra - Vasectomy: male sterilization procedure that involves removing a section from each vas deferens - Spermatic cord exits the scrotal sac through the inguinal canal, an opening that leads directly into the abdominal cavity - Vas deferens continues its upward journey along the top of the bladder and loops around the ureter - Turning downward, the vas deferens reaches the base of the bladder, which is joined by the excretory duct of the seminal vesicle, forming the ejaculatory duct o Ejaculatory ducts: two short ducts located within the prostate gland – open into the prostatic portion of the urethra  Urethra: the tube through which urine passes from the bladder to the outside of the body The Seminal Vesicles: small glands adjacent to the terminals of the vas deferens that secrete an alkaline fluid (conductive to sperm motility) that constitutes the greatest portion of th
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