Limb Development
Embryology
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Musculoskeletal & Nervous Systems
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Musculoskeletal System
Q. During week 7, which of the following is true?
a
The thumb and big toe are oriented in opposite directions because the upper limb has rotated 90° laterally, and the lower limb has rotated 90° medially
b
Cartilaginous digital rays (fingers) and carpals begin to form within the hand
c
Ectodermal ridges and apical ectodermal ridges have extend distally, and that the distal ends have begun to flatten
d
The thumb and big toe are oriented in the same direction
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