Wk5 Limb Flashcards Preview

Embriology glossary > Wk5 Limb > Flashcards

Flashcards in Wk5 Limb Deck (11)
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1
Q

limb bud

A

A thickened portion of the lateral plate somatic mesoderm which will form the tissues of the limb (excepting the muscles)

2
Q

apical ectodermal ridge

A

An anterior-posterior ridge of ectoderm running along the distal edge of the limb bud. Signals outgrowth to the limb bud mesenchyme

3
Q

zone of polarizing activity

A

A region of the posterior margin of the limb bud mesenchyme which signals to promote posterior specification

4
Q

premuscle masses

A

In the limb bud, dorsal and ventral masses of cells which will form the muscles, derived from the somites

5
Q

mesenchymal condensations

A

In the limb bud, regions of higher density of mesenchymal cells which pre-figure the limb cartilages (and bones)

6
Q

polydactyly

A

More than a normal number of digits

7
Q

syndactyly

A

Fused digits

8
Q

brachydactyly

A

Short digits

9
Q

ectrodactyly

A

Split hand split foot

10
Q

amelia

A

A lack of limbs

11
Q

phocomelia

A

An absence of intermediate segments of limb