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Summary Anatomy Item Literature (642) Expression Attributions Wiki

Anatomy Term: preplacodal ectoderm
XAO ID: 0004092
Synonyms: pre-placodal ectoderm, PPE, placodal area
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
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: Ontology Lookup Service , XB ANATOMY ONTOLOGY