Floor of pharynx of human embryo of about the end of the fourth week.
Floor of pharynx of human embryo about thirty days old.
Also known as the hypobranchial eminence.
The furcula is at first separated from the tuberculum impar by a depression, but later by a ridge, the copula, formed by the forward growth and fusion of the ventral ends of the second, third, and part of the fourth branchial arches.
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