|Head end of human embryo, about the end of the fourth week.|
|Floor of pharynx of embryo. (Second arch visible near center.)|
|Gray's||subject #13 66|
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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