Otic pit
Otic Pit
The Otic Pit (pronunciation: /ˈoʊtɪk pɪt/), also known as the Auditory Pit, is an essential structure in the early embryonic development of the ear in vertebrates.
Etymology
The term "Otic" is derived from the Greek word "otikos", which means "of the ear", and "Pit" refers to a small depression or indentation.
Definition
The Otic Pit is a depression that forms in the ectoderm, the outermost layer of an embryo, during the third week of embryonic development. This pit eventually gives rise to the structures of the inner ear, including the cochlea and the vestibular apparatus, which are responsible for hearing and balance, respectively.
Development
The formation of the Otic Pit is initiated by the Otic Placode, a thickening of the ectoderm adjacent to the developing hindbrain. The Otic Placode invaginates, or folds inward, to form the Otic Pit. As development progresses, the Otic Pit deepens and closes off to form the Otic Vesicle or Otocyst, the precursor to the inner ear.
Related Terms
- Otic Placode: The thickened area of ectoderm that initiates the formation of the Otic Pit.
- Otic Vesicle: The structure that the Otic Pit develops into, which eventually gives rise to the inner ear.
- Ectoderm: The outermost layer of an embryo, from which the Otic Pit forms.
- Cochlea: The spiral-shaped part of the inner ear that is responsible for hearing.
- Vestibular Apparatus: The part of the inner ear that is responsible for balance.
External links
- Medical encyclopedia article on Otic pit
- Wikipedia's article - Otic pit
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