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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «M»:

  1. Male chromosome Male chromosome
    Male chromosome: See: Y chromosome....
  2. Male chromosome complement Male chromosome complement
    Male chromosome complement: The large majority of males have a 46, XY chromosome complement (46 chromosomes including an X and a Y chromosome). A minority of males have other chromosome constitutions such as 47,XXY (47 chromosomes including two X chromosomes and a Y chromosome) and 47,XYY (47 chromo...
  3. Male condom Male condom
    Male condom: The male condom is a sheath placed over the erect penis before penetration, preventing pregnancy by blocking the passage of sperm. It is a barrier method of contraception. A condom can be used only once. Although some condoms have spermicide added (the spermicide is usually nonoxynol-9 ...
  4. Male external genitalia Male external genitalia
    Male external genitalia: The external genital structures of the male, comprising the penis, the male urethra, and the scrotum....
  5. Male genitalia Male genitalia
    Male genitalia: The genital organs of the male. These are usually separated by convention into the external and internal genitalia. The male external genitalia comprise the penis, the male urethra, and the scrotum. The male internal genitalia comprise the testis, epididymis, vas deferens, seminal ...
  6. Male gonad Male gonad
    Male gonad: The male gonad, the testicle (or testis), located behind the penis in a pouch of skin (the scrotum). The testicles produce and store sperm, and they are also the body's main source of male hormones (testosterone). These hormones control the development of the reproductive organs and oth...
  7. Male internal genitalia Male internal genitalia
    Male internal genitalia: The internal genital structures of the male that are concerned with reproduction, including the testis, epididymis, vas deferens, seminal vesicle, ejaculatory duct, bulbourethral gland, and the prostate....
  8. Male menopause Male menopause
    Male menopause: A controversial concept reflecting the belief that the decline in testosterone levels observed in men as they age causes a clinically significant and potentially treatable set of symptoms, including sexual dysfunction, mood changes, weight gain, fatigue, and other nonspecific symptom...
  9. Male organs of reproduction Male organs of reproduction
    Male organs of reproduction: The sum total of all the male genital organs, both internal and external, that are concerned with reproduction, including: The male external genitalia -- the penis, the male urethra, and the scrotum; and The male internal genitalia -- the testis, epididymis, ductus d...
  10. Male pelvis Male pelvis
    Male pelvis: The lower part of the abdomen located between the hip bones in the male. There are significant differences in the anatomy of the pelvis in the female and male. The male pelvis is more robust, narrower, and taller than the female pelvis. The angle of the male pubic arch and the sacrum a...
  11. Male sexual orientation gene Male sexual orientation gene
    Male sexual orientation gene: See: Gay gene....
  12. Malformation Malformation
    Malformation: A structural defect in the body due to abnormal embryonic or fetal development. There are many types of malformations. For example, cleft lip and cleft palate. See also Congenital malformation....
  13. Malformation, arteriovenous Malformation, arteriovenous
    Malformation, arteriovenous: An arteriovenous malformation (AVM) is a congenital disorder (one present at birth) of blood vessels in the brain, brainstem, or spinal cord that is characterized by a complex, tangled web of abnormal arteries and veins connected by one or more fistulas (abnormal communi...
  14. Malformation, arteriovenous (AVM) Malformation, arteriovenous (AVM)
    Malformation, arteriovenous (AVM): An arteriovenous malformation (AVM) is a congenital disorder (one present at birth) of blood vessels in the brain, brainstem, or spinal cord that is characterized by a complex, tangled web of abnormal arteries and veins connected by one or more fistulas (abnormal c...
  15. Malformation, congenital Malformation, congenital
    Malformation, congenital: A physical defect present in a baby at birth, irrespective of whether the defect is caused by a genetic factor or by prenatal events that are not genetic. In a malformation, the development of a structure is arrested, delayed, or misdirected early in embryonic life and the...