A cranial placode which, once specified, invaginates to form an otic cup, which eventually separates from the surface ectoderm to form the otic vesicle or otocyst, a rounded structure without appar- ent polarity. As the otic placode invaginates into a cup neuroblasts delaminate from the anterior ventral aspect of the otic epithelium to give rise to neurons of the vestibulocochlear (statoacoustic) ganglion of cranial nerve VIII[NBK]. [ NCBIBook : NBK53175 http://en.wikipedia.org/wiki/Otic_placode ]

This is just here as a test because I lose it

Term information

database cross reference
Subsets

uberon_slim, efo_slim, pheno_slim, vertebrate_core

definition
  • A cranial placode which, once specified, invaginates to form an otic cup, which eventually separates from the surface ectoderm to form the otic vesicle or otocyst, a rounded structure without appar- ent polarity. As the otic placode invaginates into a cup neuroblasts delaminate from the anterior ventral aspect of the otic epithelium to give rise to neurons of the vestibulocochlear (statoacoustic) ganglion of cranial nerve VIII[NBK].
development notes
  • With the exception of the pigment cells of the stria vascularis and the secretory epithelium of the cochlea, which are of neural crest origin, all compo- nents of the inner ear derive from the otic placode. In most species the thickening of the ectoderm into a placode occurs in a region adjacent to rhombomere 5 (reviewed in Ohyama et al., 2007), while in amphibians the otic placode is centered onto rhombomere 4 (Ruiz i Altaba and Jessell, 1991).
external definition
  • Primordium of the ear epithelium before it hollows into the otic vesicle, present beside the hindbrain rudiment in the midsegmentation period. Kimmel et al, 1995. (Also see Anatomical Atlas entry for ear by T. Whitfield.)[TAO]
has exact synonym
  • placoda otica
has related synonym
  • auditory placode
  • ear/otic placode
  • octaval VIII placode
  • ear placode
  • octaval placode
homology notes
  • We conclude this section by listing some of the many synapomorphies of craniates, including (...) (2) neurogenic placodes (...).[well established][VHOG]
id
  • UBERON:0003069