placode

(redirected from nasal placode)
Also found in: Encyclopedia.

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]

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.
References in periodicals archive ?
Proboscis lateralis usually occurs in association with absence of the nose on the same side [3, 5]; however, it may occur from an accessory nasal placode as seen in our case.
It is well established that at the time of consolidation of the facial processes there is a concurrent program of spontaneous cell death (PCD) involved in the removal of the epithelial debris from the developing nasal placode. When this PCD is more extensive than necessary and repair of mesenchyme is disturbed, a weakness develops in the forming lip and alveolus.
(3) An accessory nasal placode may be present either above or below the normal nasal placode.