Unit II: Limb Development Flashcards
1
Q
Which appears first: the upper limb or the lower limb?
A
Upper
2
Q
The limb bud consists of:
A
- AER
2. central core of mesenchyme
3
Q
The most critical period of limb development is ___ after fertilization
A
24-36
4
Q
What is syndactyly?
A
The fusion of digits
5
Q
What is cutaneous syndactyly?
A
Failure of webs to degenerate
6
Q
What is osseous syndactyly?
A
Fusion of bones
7
Q
What is polydactyly?
A
Extra digits
8
Q
Which bone is homologous to the humerus?
A
Femur
9
Q
Which bone is homologous to the tibia?
A
Radius
10
Q
Which bone is homologous to the ulna?
A
Fibula
11
Q
Which bone is homologous to the metatarsals?
A
Metacarpals
12
Q
The thumb is homologous to the ___
A
Great toe
13
Q
The upper limb rotates ___ degrees ___
A
90, laterally
14
Q
The lower limb rotates ___ degrees ___
A
90, medially
15
Q
What is amelia?
A
Complete absence of a limb
