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| {{Short description|Failure of an organ to develop during embryonic growth}} | |||
| ⚫ | In ], '''agenesis''' refers to the failure of an ] to develop during ] growth and development |
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| ⚫ | In ], '''agenesis''' ({{IPAc-en|eɪ|ˈ|dʒ|ɛ|n|ə|s|ə|s}}<ref> in ''''.</ref>) refers to the failure of an ] to develop during ] growth and development due to the absence of primordial tissue. Many forms of agenesis are referred to by individual names, depending on the organ affected: | ||
| ⚫ | *]- failure of the |
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| ⚫ | *]- failure of one or both of the kidneys to develop |
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| ⚫ | *]- failure of the arms or legs to develop |
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| ⚫ | *]- failure of |
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| ⚫ | *] - failure of the Corpus callosum to develop | ||
| In ], '''agenesis''' means to have no beginning or to have no creator, to come into existence without the influence of an outside intelligence. | |||
| ⚫ | *] - failure of one or both of the kidneys to develop | ||
| ⚫ | *] - failure of the arms or legs to develop | ||
| ⚫ | *] - failure of penis to develop | ||
| *] - failure of the uterus and part of the vagina to develop | |||
| *] - failure of the Gallbladder to develop. A person may not realize they have this condition unless they undergo surgery or medical imaging, since the gallbladder is neither externally visible nor essential. | |||
| __TOC__ | |||
| ==Eye agenesis== | |||
| ⚫ | ] | ||
| '''Eye agenesis''' is a medical condition in which people are born with no ]s. | |||
| ==Dental & oral agenesis== | |||
| {{disambig}} | |||
| *], absence of all primary or permanent teeth. | |||
| *], absence of the tongue. | |||
| *], absence of the jaw. | |||
| *] - most adult humans have three molars (on each upper/lower left/right side), with the third being referred to as the ]. But many people have less than the four total. Agenesis of wisdom teeth is a normal condition that can differ widely by population, ranging from practically zero in ] to nearly 100% in ].<ref>{{cite journal |pmid=11220165 |year=1999 |last1=Rozkovcová |first1=E. |last2=Marková |first2=M. |last3=Dolejší |first3=J. |title=Studies on agenesis of third molars amongst populations of different origin |volume=100 |issue=2 |pages=71–84 |journal=Sborník Lékařský}}</ref> (See with world map showing prevalence.) | |||
| ==Ear agenesis== | |||
| ] | |||
| '''Ear agenesis''' is a medical condition in which people are born without ]s. | |||
| ] | |||
| ] | |||
| Because the middle and inner ears are necessary for hearing, people with complete agenesis of the ears are totally ]. Minor agenesis that affects only the visible parts of the outer ear, which may be called ], typically produces cosmetic concerns and perhaps hearing impairment if the opening to the ear canal is blocked, but not deafness. | |||
| ] | |||
| ] | |||
| ==References== | |||
| {{reflist}} | |||
| ] | |||
| ] | |||
| ⚫ | ] | ||
Latest revision as of 21:39, 21 July 2024
Failure of an organ to develop during embryonic growth Medical condition| Agenesis | |
|---|---|
| Specialty | Medical genetics |
In medicine, agenesis (/eɪˈdʒɛnəsəs/) refers to the failure of an organ to develop during embryonic growth and development due to the absence of primordial tissue. Many forms of agenesis are referred to by individual names, depending on the organ affected:
- Agenesis of the corpus callosum - failure of the Corpus callosum to develop
- Renal agenesis - failure of one or both of the kidneys to develop
- Amelia - failure of the arms or legs to develop
- Penile agenesis - failure of penis to develop
- Müllerian agenesis - failure of the uterus and part of the vagina to develop
- Agenesis of the gallbladder - failure of the Gallbladder to develop. A person may not realize they have this condition unless they undergo surgery or medical imaging, since the gallbladder is neither externally visible nor essential.
Eye agenesis
Eye agenesis is a medical condition in which people are born with no eyes.
Dental & oral agenesis
- Anodontia, absence of all primary or permanent teeth.
- Aglossia, absence of the tongue.
- Agnathia, absence of the jaw.
- Wisdom tooth agenesis - most adult humans have three molars (on each upper/lower left/right side), with the third being referred to as the wisdom tooth. But many people have less than the four total. Agenesis of wisdom teeth is a normal condition that can differ widely by population, ranging from practically zero in Tasmanian Aborigines to nearly 100% in indigenous Mexicans. (See research paper with world map showing prevalence.)
Ear agenesis
Ear agenesis is a medical condition in which people are born without ears.
Because the middle and inner ears are necessary for hearing, people with complete agenesis of the ears are totally deaf. Minor agenesis that affects only the visible parts of the outer ear, which may be called microtia, typically produces cosmetic concerns and perhaps hearing impairment if the opening to the ear canal is blocked, but not deafness.
References
- Entry "agenesis" in Merriam-Webster Online Dictionary.
- Rozkovcová, E.; Marková, M.; Dolejší, J. (1999). "Studies on agenesis of third molars amongst populations of different origin". Sborník Lékařský. 100 (2): 71–84. PMID 11220165.