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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56.Lysis of fibrin is brought about by:

A. Plasmin B. Hyaluronidase
C. Collagenase D. Coagulase


Answer is: A- Plasmin. (Ref. K.D. Tripathi-5th )



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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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