placode

(redirected from otic placode)
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placode

 [plak´ōd]
a platelike structure, especially a thickening of the ectoderm marking the site of future development in the early embryo of an organ of special sense, e.g., the auditory placode (ear), lens placode (eye), and olfactory placode (nose).

plac·ode

(plak'ōd),
Local thickening in the embryonic ectodermal layer; the cells of the placode ordinarily constitute a primordial group from which a sense organ or ganglion develops.
[G. plakōdēs, fr. plax, anything flat or broad, + eidos, like]

placode

/plac·ode/ (plak´ōd) a platelike structure, especially a thickened plate of ectoderm in the early embryo, from which a sense organ develops, e.g., otic p. (ear), lens p. (eye), and nasal p. (nose).

plac·ode

(plak'ōd)
Local thickening in the embryonic ectodermal layer; the cells of the placode ordinarily constitute a primordial group from which a sense organ or ganglion develops.
[G. plakōdēs, fr. plax, anything flat or broad, + eidos, like]

placode

a plate-like embryonic structure from which a particular organ, such as the eye, develops.

placode

a platelike structure, especially a thickening of the ectoderm marking the site of future development in the early embryo of an organ of special sense, e.g. the auditory placode (ear), lens placode (eye) and olfactory placode (nose).

lens placode
the ectodermal thickening which develops into the lens vesicle and later the lens.
nasal placode
one of a pair of ectodermal thickenings which are the forerunners of the external nares and nasopharyngeal epithelium.
olfactory placode
an ectodermal thickening of the embryo which ultimately provides the sensory nerves for the olfactory region of the nasal mucosa.
otic placode
one of the pair of ectodermal thickenings in the vertebrate embryo which invaginates and is a major contributor to the internal ear.
References in periodicals archive ?
Collazo and his team discovered that physically removing either the front or back half of the otic placode in the Xenopus frog results in a high percentage of mirror image duplicated inner ears.