Showing posts with label EMBROLOGY. Show all posts
Showing posts with label EMBROLOGY. Show all posts

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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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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