Lower limb buds bulge from the lateral aspect of which segments of the trunk ?
a. C5-T1
b. T7-L2
c. L1-S5
d. L2-S2
ANSWER:
Ans: D
The upper and lower limbs develop from limb buds that arise from the lateral body wall during the 4th and 5th weeks, respectively.
Upper limb -> C5 - T1 segments.
During the 5th week, lower limb buds bulge from the lateral aspect of the L2 - S2 segments of the trunk.
Also, during the seventh week of gestation the limbs rotate in opposite directions. The upper limb rotates 90◦ laterally, so that the extensor muscles lie on the lateral and posterior surface and the thumbs lie laterally, whereas the lower limb rotates approximately 90◦ medially, placing the extensor muscles on the anterior surface and the big toe medially.
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Good question and nice explanation , thanks.
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