The cerebral hemispheres develop from which of the following vesicles:

 # The cerebral hemispheres develop from which of the following vesicles? 

a. Forebrain

b. Midbrain

c. Hindbrain

d. Primary brain

The correct answer is a. Forebrain.

 The cerebral hemispheres develop from the forebrain vesicles.

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The first step of mitosis is:

 # The first step of mitosis is which of the following? 

a. Telophase

b. Metaphase

c. Prophase

d. Anaphase 

The correct answer is: C. Prophase.

Prophase is the first step of mitosis in which four structural changes occur.

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Melanoblastoma are derived from:

 # Melanoblastoma are derived from:

A. Basal epidermal cells

B. Neural crest cells

C. Prickle cells of epidermis

D. Somato pleuric mesoderm

The correct answer is B. Neural crest cells.

Melanoblastoma are derived from Neural crest cells.

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Notochord develops in:

 # 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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