Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic representation of various types of cranial placodes in a 10-somite stage chick embryo (modified from Streit, 2004). Individual placodes develop in morphologically distinct domains along the neural tube in the head region. The adenohypophyseal placode develops ventral to the forebrain and is indicated here with a dotted line.
