# Notochord develops in:
A. 3rd week
B. 3rd month
C. 6th month
D. 10th month
The correct answer is A. 3rd week.
The notochord arises from axial mesoderm at about 16 days and is completely formed by the beginning of the fourth week. It defines the longitudinal axis of the embryo, determines the orientation of the vertebral column, and persists as the nucleus pulposus of the intervertebral discs.
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