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Grade II: A partially developed ear (usually the top portion is underdeveloped) with a closed stenotic external ear canal producing a conductive hearing loss. Grade III: Absence of the external ear with a small peanut-like vestige structure and an absence of the external ear canal and ear drum. Grade III microtia is the most common form of ...
Microtia Freudenthal, 1976 (preoccupied) Mikrotia is an extinct rodent belonging to the Muridae . It lived during the upper Miocene (about 11.63 - 5 million years ago) and its fossil remains have been found in Italy ( Gargano ).
Microtia is a congenital deformity where the auricle (external ear) is underdeveloped. A completely undeveloped pinna is referred to as anotia. Because microtia and anotia have the same origin, it can be referred to as microtia-anotia. [16] Microtia can be unilateral (one side only) or bilateral (affecting both sides).
The surgical option is cosmetic reconstruction of the external ear's normal shape and repair of the ear canal. In less severe cases, the reconstruction will be sufficient to restore hearing. In grades of anotia/microtia that affect the middle ear, the surgery with the use of a bone-anchored hearing aid (BAHA) will likely restore the hearing ...
An evolutionary grade is a group of species united by morphological or physiological traits, that has given rise to another group that has major differences from the ancestral group's condition, and is thus not considered part of the ancestral group, while still having enough similarities that we can group them under the same clade.
Grades 6 to 9 featured severe holoprosencephaly. Grades 10 to 12 featured aprosopus (absence of the face and most of the head) with absence of the prosencephalon and mesencephalon . One human case corresponding to a high Wright grade has been reported in modern history [ broken anchor ] .
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Otoplasty (surgery of the ear) was developed in ancient India and is described in the medical compendium, the Sushruta Samhita (Sushruta's Compendium, c. 500 AD).The book discussed otoplastic and other plastic surgery techniques and procedures for correcting, repairing and reconstructing ears, noses, lips, and genitalia that were amputated as criminal, religious, and military punishments.