Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
Summary Anatomy Item Literature (628) Expression Attributions Wiki
XB-ANAT-1586

Anatomy Term: preplacodal ectoderm
XAO ID: 0004092
Synonyms: pre-placodal ectoderm, PPE
Definition: "A thick, U-shaped primordium positioned at the border of the future epidermis and the neural plate/neural crest forming regions, in the neural stage embryo. This field of naive ectoderm is subdivided into 3 domains, each with distinct gene expression profiles: the anterior PPE (bottom of the U), the lateral PPE (the curves of the U), and the posterior PPE (arms of the U and adjacent to the neural crest/neural plate border). The PPE differentiates into the sensory placodes, which in turn form the adenohypophysis/anterior pituitary gland and sensory organs (such as the olfactory epithelium, lens, trigeminal nerves, epibranchial nerves, otic vesicles and lateral lines)."
Stage Range: NF stage 11.5 to NF stage 28
Marker Genes: six3 neurod4 pax6 muc2 pax3 pax8
1/5
Develops From:
Anatomy Item Stage Range
neural plate border NF stage 11.5 to NF stage 22
non-neural ectoderm NF stage 10 to NF stage 28
sensorial layer of neurectoderm NF stage 11.5 to NF stage 66
Develops Into:
Anatomy Item Stage Range
lens placode NF stage 13 to NF stage 28
neurogenic placode NF stage 13 to NF stage 42
non-neurogenic ectodermal placode NF stage 13 to NF stage 42
olfactory epithelium NF stage 23 to death
trigeminal nerve NF stage 28 to death
Parent(s): neural plate border, non-neural ectoderm, sensorial layer of neurectoderm

 

Parent(s): non-neural ectoderm (is_a) tissue (is_a) sensorial layer of neurectoderm (part_of)

 


References: NCBO BioPortal , Ontology Lookup Service
Xenbase: The Xenopus laevis and X. tropicalis resource.
Version: 4.12.1


Major funding for Xenbase is provided by grant P41 HD064556