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The term, 'contraception' derives from the Latin 'contra', which means 'against', and the word '[[Conception_(biology)|conception]]', <ref>[http://medical-dictionary.thefreedictionary.com/conception] conception - definition of conception in the Medical dictionary - by the Free Online Medical Dictionary</br>
 
Dorland's Medical Dictionary for Health Consumers.  2007</br>
The term, 'contraception' derives from the Latin 'contra', which means 'against', and the word '[[Conception_(biology)|conception]]', which is the non-technical term for fertilization.  'Contraception' may be used to refer merely to the prevention of fertilization, but it is more commonly used to refer to the means employed to avoid fertilization.  When referring to a means of prevention, it is synonymous with contraceptive [[birth control]].  Any procedure or device which would keep a sperm cell from fertilizing the egg, therefore, can be considered to be contraception.   
Gale Encyclopedia of Medicine. Copyright 2008</br>
 
Mosby's Medical Dictionary, 8th edition. 2009</br>
__TOC__
The American Heritage Medical Dictionary Copyright 2007, 2004</br>
</ref> which is the non-technical term for fertilization.
<ref>[http://medical-dictionary.thefreedictionary.com/fertilization] fertilization - definition of fertilization in the Medical dictionary - by the Free Online Medical Dictionary</br>
Dorland's Medical Dictionary for Health Consumers. 2007</br>
The American Heritage® Medical Dictionary Copyright 2007, 2004</br>
Gale Encyclopedia of Medicine. Copyright 2008</br>
Mosby's Medical Dictionary, 8th edition.  2009</br>
McGraw-Hill Concise Dictionary of Modern Medicine. 2002</ref>
'Contraception' may be used to refer merely to the prevention of fertilization, but it is more commonly used to refer to the means employed to avoid fertilization.  When referring to a means of prevention, it is synonymous with contraceptive [[birth control]].  Any procedure or device which would keep a sperm cell from fertilizing the egg, therefore, can be considered to be contraception.   


==Contrasted with Other Birth Control==
==Contrasted with Other Birth Control==
Birth control can refer to anything which would prevent childbirth.  Methods of birth control can be classified by the stage of reproduction which is achieved before the process is brought to a halt.  If a form of birth control seeks to prevent the sperm from fertilizing the egg, then it is contraceptive.  If fertilization has already occurred, but the birth control seeks to prevent the implantation of the embryo into the uterine lining, then it is a contragestive.  Just as a contraception is the avoidance of conception, contragestion is the avoidance of gestation.   
Birth control can refer to anything which would prevent childbirth.  Methods of birth control can be classified by the stage of reproduction which is achieved before the process is brought to a halt.  If a form of birth control seeks to prevent the sperm from fertilizing the egg, then it is contraceptive<ref>[http://medical-dictionary.thefreedictionary.com/contraceptive]contraceptive - definition of contraceptive in the Medical dictionary - by the Free Online Medical Dictionary</br>
If the process has been preventedDepending upon what Contraceptives; contragestives; abortifacients; surgical abortion
McGraw-Hill Concise Dictionary of Modern Medicine. 2002</br>
 
Dorland's Medical Dictionary for Health Consumers.  2007</br>
==Contraceptive Devices==
The American Heritage® Medical Dictionary Copyright 2007, 2004</br>
[[Barrier contraception]] methods prevent pregnancy by physically preventing sperm from entering the uterus.  A [[condom]] is a device which is put on a man's erect penis and physically blocks ejaculated semen from entering the body of a sexual partner.  Condoms designed to be used by women are called female condoms.  The [[female condom]] is a pouch with flexible rings at each end. The ring inside the pouch is inserted deep into the vagina, to hold the condom in place. The penis is directed into the pouch through the ring at the open end, which stays outside the vaginal opening during intercourse. The [[diaphragm]] is a cervical barrier composed of a soft latex or silicone dome and a spring which is molded into the rim. The spring creates a seal against the walls of the vagina.
Mosby's Medical Dictionary, 8th edition.  2009</br>
 
</ref>.  If fertilization has already occurred, but the form of birth control seeks to prevent the implantation of the embryo into the uterine lining, then it is a contragestive. <ref>[http://medical-dictionary.thefreedictionary.com/contragestive]contragestive - definition of contragestive in the Medical dictionary - by the Free Online Medical Dictionary</br>
==Chemical Contraceptives==
The American Heritage® Medical Dictionary Copyright 2007, 2004
[[Spermicide]] is a substance that kills sperm, inserted vaginally prior to intercourse to prevent pregnancy. [[Hormonal contraception]] is birth control that acts on the hormonal system.  It may cause ovulation to cease, preventing the possibility of fertilization or it may thicken the woman’s cervical mucus, making penetration of the uterus by sperm more difficult.  Hormone based birth control can also alter and thin the endometrium so that a fertilized egg has difficulty implanting.  Technically, if the drug works in this fashion, it acts as a contragestive rather than a contraceptive, since it has not prevented conception, acting instead to prevent gestation. 
</ref> Just as a contraception is the avoidance of conception, contragestion is the avoidance of gestation.  If implantation has already occurred, but the form of birth control seeks to end gestation by terminating the pregnancy prior to birth, then it is an abortion.
 
==Surgical Contraception==
Another form of contraception is [[Sterilization_(surgical_procedure)|sterilization]].  [[Vasectomy]] is a surgical procedure wherein the vasa deferentia of a man are severed, and then tied or sealed in a manner to prevent sperm from entering the [[ejaculate|seminal stream]].  [[Tubal ligation]] is a surgical procedure in which the fallopian tubes are severed and sealed or "pinched shut", in order to prevent fertilization.


==Behavioral Contraception==
* ''Contraception: contraceptives prevent the sperm from fertilizing the egg
[[Fertility awareness]] refers to a set of practices used to determine the fertile and infertile phases of a woman's menstrual cycle. When used as a methods to avoid pregnancy, it to is a form  of contraception.  When defined broadly, behavioral contraception may include abstinence.  [[Abstinence]] is the voluntary restraint from indulging sexual intercourse.
* ''Contragestion: contragestives prevent implantation after fertilization has occurred or by causing the uterine lining to shed after implantation.
* ''Abortion: after implantation has occurred, [[abortifacients]]<ref>[http://medical-dictionary.thefreedictionary.com/abortifacient] 'abortifacient - definition of abortifacient in the Medical dictionary - by the Free Online Medical Dictionary</br>
McGraw-Hill Concise Dictionary of Modern Medicine. 2002 </br>
Dorland's Medical Dictionary for Health Consumers. 2007 </br>
Mosby's Medical Dictionary, 8th edition.  2009</ref> terminate the pregnancy before it comes to term


==Other==
==See also==
===Contraceptive Sponge===
* [[Beginning of pregnancy controversy]]
The [[contraceptive sponge]] combines barrier and spermicidal methods to prevent conception. The sponges are inserted vaginally prior to intercourse and must be placed over the cervix to be effective.  Sponges are a physical barrier, trapping sperm and preventing their passage through the cervix into the female reproductive system. The spermicide is an important component of pregnancy prevention; each brand offers a different formula.


===Non-Surgical Sterilization===
==References==
The drug [[quinacrine]] has been researched for non-surgical sterilization of women. Pellets of quinacrine are inserted through the cervix into a woman's uterine cavity using a preloaded inserter device. The procedure is undertaken twice, first in the proliferative phase, 6 to 12 days following the first day of the menstrual cycle and again one month later. The sclerosing effects of the drugs at the utero-tubal junctions (where the Fallopian tubes enter the uterus) results in scar tissue forming over a six week interval to close off the tubes permanently.
<references/>


===Emergency Contraception===
[[Emergency contraception]] refers to contraceptive measures that, if taken after sex, may prevent pregnancy.  As is the case with hormone based birth control, emergency contraception refers to some forms of birth control which are technically contragestives. 


===Male Contraceptive===
[[Category:Birth control]]
Any agent which interfere with male fertility may be classified as a [[male contraceptive]].

Latest revision as of 08:28, 12 June 2009

The term, 'contraception' derives from the Latin 'contra', which means 'against', and the word 'conception', [1] which is the non-technical term for fertilization. [2] 'Contraception' may be used to refer merely to the prevention of fertilization, but it is more commonly used to refer to the means employed to avoid fertilization. When referring to a means of prevention, it is synonymous with contraceptive birth control. Any procedure or device which would keep a sperm cell from fertilizing the egg, therefore, can be considered to be contraception.

Contrasted with Other Birth Control

Birth control can refer to anything which would prevent childbirth. Methods of birth control can be classified by the stage of reproduction which is achieved before the process is brought to a halt. If a form of birth control seeks to prevent the sperm from fertilizing the egg, then it is contraceptive[3]. If fertilization has already occurred, but the form of birth control seeks to prevent the implantation of the embryo into the uterine lining, then it is a contragestive. [4] Just as a contraception is the avoidance of conception, contragestion is the avoidance of gestation. If implantation has already occurred, but the form of birth control seeks to end gestation by terminating the pregnancy prior to birth, then it is an abortion.

  • Contraception: contraceptives prevent the sperm from fertilizing the egg
  • Contragestion: contragestives prevent implantation after fertilization has occurred or by causing the uterine lining to shed after implantation.
  • Abortion: after implantation has occurred, abortifacients[5] terminate the pregnancy before it comes to term

See also

References

  1. ↑ [1] conception - definition of conception in the Medical dictionary - by the Free Online Medical Dictionary
    Dorland's Medical Dictionary for Health Consumers. 2007
    Gale Encyclopedia of Medicine. Copyright 2008
    Mosby's Medical Dictionary, 8th edition. 2009
    The American Heritage Medical Dictionary Copyright 2007, 2004
  2. ↑ [2] fertilization - definition of fertilization in the Medical dictionary - by the Free Online Medical Dictionary
    Dorland's Medical Dictionary for Health Consumers. 2007
    The American Heritage® Medical Dictionary Copyright 2007, 2004
    Gale Encyclopedia of Medicine. Copyright 2008
    Mosby's Medical Dictionary, 8th edition. 2009
    McGraw-Hill Concise Dictionary of Modern Medicine. 2002
  3. ↑ [3]contraceptive - definition of contraceptive in the Medical dictionary - by the Free Online Medical Dictionary
    McGraw-Hill Concise Dictionary of Modern Medicine. 2002
    Dorland's Medical Dictionary for Health Consumers. 2007
    The American Heritage® Medical Dictionary Copyright 2007, 2004
    Mosby's Medical Dictionary, 8th edition. 2009
  4. ↑ [4]contragestive - definition of contragestive in the Medical dictionary - by the Free Online Medical Dictionary
    The American Heritage® Medical Dictionary Copyright 2007, 2004
  5. ↑ [5] 'abortifacient - definition of abortifacient in the Medical dictionary - by the Free Online Medical Dictionary
    McGraw-Hill Concise Dictionary of Modern Medicine. 2002
    Dorland's Medical Dictionary for Health Consumers. 2007
    Mosby's Medical Dictionary, 8th edition. 2009
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