Mechanism
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  Mechanism



Mechanism

    The arrangement or association of the elements or parts of anything in relation to the effect they generate; the combination of mental processes by which an effect is generated.

RELATED TERMS
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Association
1. In dysmorphology (the study of birth defects), the nonrandom occurrence in two or more individuals of a pattern of multiple anomalies (birth defects) not known to be a malformation syndrome (such as Down syndrome), a malformation sequence (of events) or what is called a polytopic field defect (in which all of the defects are concentrated in one particular area of the body). An example of an association in dysmorphology is the VACTERL association of birth defects. 2. In genetics, the occurrence together of two or more characteristics more often than would be expected by chance alone. An example of association involves a feature on the surface of white blood cells called HLA (HLA stands for human leukocyte antigen). A particular HLA type, HLA type B-27, is associated with an increased risk for a number of diseases including ankylosing spondylitis. The extent of the association is enormous. Ankylosing spondylitis is 87 times more likely to occur in people with HLA B-27 than in the general population.

Elements
Substances that comprise all matter. Each element is made up of atoms that are identical in number of electrons and protons and in nuclear charge, but may differ in mass or number of neutrons.



SIMILAR TERMS
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Mechanical Valve
In people who require heart valve replacement surgery, it is sometimes desirable to implant a mechanical valve. A mechanical valve is made of artificial parts and functions similarly to a normal heart valve. People who have a mechanical valve implanted must take blood thinners lifelong to prevent blood clots from forming on the mechanical valve.



PREVIOUS AND NEXT TERMS
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Master
Sadomasochistic vernacular term for the sadistic partner whose role is one of total domination and disciplinarian.

Masturbation
Sexuoerotic genital self-stimulation by pressure or touch, self-stimulation, usually though not necessarily climaxing in orgasm [from Latin, manus, hand + st[u]parare, to deflower, ravish, fornicate, or to engage in adultery, incest, or rape]. From its Latin derivation, the literal meaning of masturbation is to use the genitalia to ravish or rape the hand. etymologically, hand-rape, the manual practice of erotic self-stimulation, formerly stigmatized as a crime against nature. Today it is considered normal and healthy and is not limited to either the hands or the self. It includes digital stimulation of the genitalia of a partner as well as of oneself.

Masturbation fantasy
Cognitional rehearsal of erotically stimulating activity that accompanies, and may precede, an episode of masturbation. To the extent that the content of its imagery and ideation, like that of a sleeping dream, has a high degree of autonomy and individual specificity in its power to stimulate genital arousal, it is not voluntarily chosen or preferred. 2. Imagery of erotically stimulating content that accompanies, and may precede, an episode of masturbation. Like the imagery of a sleeping dream, its content has a high degree of autonomy and is not voluntarily chosen.

Mayer-Rokitansky-Kuester syndrome
A sexual birth defect characterized by impaired differentiation of the Müllerian ducts so that the uterus is rudimentary and cordlike. The deep part of the vagina is absent and the outer part is shallow or in the form of a dimple. The fallopian tubes may be defective, and there may be other sporadic congenital anomalies. The ovaries are normal and induce normal femininizing puberty, except for lack of menstruation secondary to the defective uterus. Psychosexual differentiation is as a female.

Meatus
An opening or passageway in the body, such as the urinary meatus.

Mechanism

Medroxyprogesterone acetate (MPA)
The generic name of Depo-Provera. It has many of the physiological properties of progesterone, and so is known as a synthetic progestin, although in chemical structure it is actually an androgen, like testosterone, which is closely related to progesterone. Therapeutically, MPA has varied uses: to suppress ovulation (in the birth control pill); to prevent spermatogenesis (as a male contraceptive); and as an antiandrogen to suppress androgen release and sexuoeroticism, reversibly, in male sex offenders. 2. A pharmaceutical hormonal product marketed under the name of Provera or Depo-Provera.® It has many of the physiological properties of progesterone, and so is known as a synthetic progestin, though in chemical structure it is actually an androgen, like testosterone, which is closely related to progesterone. Therapeutically, medroxyprogesterone acetate has varied uses: to suppress ovulation (in the birth-control injection or pill); to prevent spermatogenesis (as a male contraceptive); and as an antiandrogen to suppress androgen release and libido, reversibly, in male sex offenders (chemical castration).

Menage a trois
See troilism [French, household of three].

Menstrual
An endocrine cycle of 28 days in women which includes fluctuations in estrogen and progesterone, the events of enodmetrial development, follicular maturation, ovulation, changes in cervical mucus secretion, breast vascularization changes, and if pregnancy does not occur, menstruation.

Menstruation
In women, the periodic (monthly) bloody discharge from the uterus and vagina approximately two weeks after ovulation.

Mercantile paraphilia
One of a group of paraphilias characterized by triumph wrested developmentally from sexuoerotic tragedy by means of a strategy that incorporates sinful lust into the lovemap on the condition that it be traded, bartered, or purchased and paid for, not freely exchanged, since it irrevocably defiles saintly love.

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