Agenesis

Eye agenesis is a medical condition in which people are born with no eyes.

• 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.^[2] (See research paper with world map showing prevalence.)

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.