74. At which of the following ages does fetal movement first occur?

A. 1 month B. 2 months

C. 4 months D. 6 months E. 7 months


The correct answer is B. Neuromuscular development is sufficient to allow fetal movement in the

eighth week of life. Other features of Week 8 include the first appearance of a thin skin, a head as

large as the rest of the body, forward-looking eyes, appearance of digits on the hands and feet,

appearance of testes and ovaries (but not distinguishable external genitalia), and a crown-rump length

of approximately 30 mm. By the end of the eighth week, nearly all adult structures have at least begun to 

develop, and the fetus "looks like a baby." 

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57. The primary germ layer endoderm is derived from :

a) Embronal disc b) Yolk sac
c) Amniotic cavity d) Placenta


ANS. b

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55.Which of the following is NOT a Neural Crest Derivatives:

a. Odontoblasts b. Bones of the face and skull
c. Melanocytes d. None

ANS>D

Neural Crest Derivatives

• · Connective tissue and bones of the face and skull
• 
  
• · Cranial nerve ganglia
• 
  
• · C cells of the thyroid gland
• 
  
• · Conotruncal septum in the heart
• 
  
• · Odontoblasts
• 
  
• · Dermis in face and neck
• 
  
• · Spinal (dorsal root) ganglia
• 
  
• Sympathetic chain and preaortic ganglia
• Parasympathetic ganglia of the gastrointestinal tract
• Adrenal medulla
• Schwann cells
• Glial cells
• Arachnoid and pia mater (leptomeninges)
• Melanocytes

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