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Male Reproductive Anatomy
Anatomy and Functions of Sexual Organs
61
Psychology
Undergraduate 3
02/11/2012

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Cards

Term
Penis
Definition
Sex organ used in sexual intercourse. Unlike the vagina, it also serves as a conduit for urine.
Term

Corpora Cavernosa

Definition
sponge-like regions of erectile tissue which contain most of the blood in the penis during penile erection
Term
Corpus Spongiosum
Definition
The spongy body that runs along the botton of the penis, contains the penile urethra, and enlarges at the tip of the penis to form the glans.
Term
Corona
Definition
The ridge that separates the glans from the body of the penis.
Term
Frenulum
Definition
The sensitive strip of tissue that connects the underside of the penile glands to the shaft.
Term
Root
Definition
The base of the penis, which extends into the pelvis.
Term
Penile Shaft
Definition
The body of the penis, which expands as a result of vasocongestion.
Term
Foreskin
Definition
The loose skin that covers the penile glans. Also refered to as the prepuce.
Term
Circumcision
Definition
Surgical removal of the foreskin of the penis.
Term
Phimosis
Definition
An abnormal condition in which the foreskin is so tight that it cannot be withdrawn from the glans.
Term
Scrotum
Definition
The pouch of loose skin that contains the testes.
Term
Spermatic Cord
Definition
The cord that suspends a testicle within the scrotum and contains a vas deferens, blood vessels, nerves, and the cremaster muscle.
Term
Vas Deferens
Definition
A tube that conducts sperm from the testicle to the ejaculatory duct of the penis.
Term
Cremaster muscle
Definition
The muscle that raises and lowers the testicle in response to temperature changes and sexual stimulation.
Term
Germ Cells
Definition
A cell from which a new organism develops.
Term
Sperm
Definition
The male germ cell
Term
Androgens
Definition
Male sex hormones
Term
Testosterone
Definition
A male steroid sex hormone
Term
Interstitial cells
Definition
Cells that lie between the seminiferous tubules and secrete testosterone.
Term
Leydig's cells
Definition
Another term for interstitial cells.
Term
Secondary sex characteristics
Definition
Traits that distinguish the genders but are not directly involved in reproduction. (Examples: beard, deep voice, and muscle mass)
Term
Seminiferous Tubules
Definition
Tiny, winding, sperm-producing tubes within the lobes of the testes.
Term
Dartos Muscle
Definition
The muscle in the middle layer of the scrotum that contracts and relaxes in response to temperature changes.
Term
Spermatogenesis
Definition
The process by which sperm cells are produced and developed.
Term
Spermatocyte
Definition
An early stage in the development of sperm cells, in which each parent cell has 46 chromosomes, including one X and Y sex chromosome.
Term
Spermatids
Definition
Cells formed by the division of spermatocytes. Each spermatid has 23 chromosomes.
Term
Spermatozoa
Definition
Mature sperm cells.
Term
Epididymis
Definition
A tube that lies against the back wall of each testicle and stores sperm.
Term
Vasectomy
Definition
Severing of the vas deferens, preventing sperm from reaching the ejacualtory duct.
Term
Seminal vesicles
Definition
Small glands that lie behind the bladder and secrete fluids that combine with sperm in the ejaculatory ducts.
Term
Ejaculatory duct
Definition
A duct formed by the convergence of a vas deferens with a seminal vesicle through which sperm pass through the prostate gland and into the urethra.
Term
Cilia
Definition
Hairlike projections from cells that beat rhythmically to produce locomotion or currents.
Term
Prostate gland
Definition
The gland that lies beneath the bladder and secretes prostatic fluid, which gives semen its characteristic odor and texture.
Term
Cowper's gland
Definition
Structures that lie below the prostate and empty their secretions into the urethra during sexual arousal.
Term
Bulbourethral glands
Definition
Another term for Cowper's glands
Term
Semen
Definition
The whitish fluid that constitutes the ejaculate, consisting of sperm and secretions from the seminal vesicles, prostate, and Cowper's glands.
Term
Urethritis
Definition
An inflammation of the bladder or urethra
Term
Cryptorchidism
Definition
A condition in which one or two testicles fails to descend from the abdomen into the scrotum.
Term
Benign Prostatic hyperplasia
Definition
Enlargement of the prostate due to hormonal changes of aging and symptomized by urinary frequency, urinary urgency, and difficulty starting the flow of urine.
Term
Prostatitis
Definition
Inflammation of the prostate gland.
Term
Erection
Definition
Enlargement and stiffing of the penis caused by engorgement with blood.
Term
Performance Anxiety
Definition
Feelings of dread and foreboding experienced in connection with sexual activity (or any other activity that might be judged by another person).
Term
Sacrum
Definition
The thick, triangular bone located near the bottom of the spinal column.
Term
Autonomic nervous system
Definition
The division of the nervous system that regulates autonomic bodily processes, such as heartbeat, pupil dilation, respiration, and digestion.
Term
Sympathetic
Definition
The branch of the ANS most active during emotional responses that spend energy, such as fear and anxiety. The sympathetic ANS largely controls ejaculation.
Term
Parasympathetic
Definition
The branch of the ANS most active during processes that restore energy, like digestion. The parasympathetic ANS largely controls erection.
Term
Peyronie's Disease
Definition
Excessive curvature of the penis that can make erections painful.
Term
Orgasm
Definition
The climax of sexual excitement
Term
Parapelgic
Definition
A person with sensory and motor paralysis of the lower half of the body.
Term
Emission Stage
Definition
The first phase of ejaculation, which involves contractions of the prostate gland, seminal vesicles, and the upper part of the vas deferens.
Term
Ampulla
Definition
A sac or dilated part of a tube or canal. 
Term
Urethral bulb
Definition
The small tube that makes up the prostatic part of the urethral tract and that balloons out as muscles close at either end, trapping semen prior to ejaculation. 
Term
Expulsion Stage
Definition
The second stage of ejaculation, during which muscles at the base of the penis and elsewhere contract rhythimically, forcefully expelling semen and providing pleasurable sensations. 
Term
Retrograde Ejaculation
Definition
Ejaculation in which the ejaculate empties into the bladder. 
Term
Glans
Definition

is the sensitive bulbous structure at the distal end of the penis. The glans penis is anatomically homologous to the clitoral glans of the female. It is sometimes fully or partially covered by the foreskin, except in men who have been fully circumcised.

 

 

Term
Meatus
Definition
Opening of the urethra, situated on the glans
Term
Baculum
Definition
The penile bone 
Term

Proportions of various substances in semen

Definition
1% sperm, 70% seminal fluid, 30% prostate fluid
Term

Amount of sperm per ejaculation

Definition
150 million to 500 million
Term

Amount of sperm produced per year

Definition
500 million per day...sooo...
Term

Life span of sperm

Definition
Five to Seven days
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