Ectodermal and mesodermal deratives

4 important questions on Ectodermal and mesodermal deratives

Name three common neural tube closure defects

  • Spina bifida: no closure of the posterior neuropore on the 27th day
  • anencephaly: no closure of the anterior neuropore
  • craniorachischisis: no closure over the entire length

How is the pituitary gland formed?

Part of the early brain (diencephalon --> ventral side of hypothalamus > infundibulum) and part of the roof of the primitive mouth (stomodeum) grow towards each other to form the pituitary gland.

What is the name of the stalk of the roof of the mouth + what is the function?

The Rathke's pouch, regresses and wraps around the infundibulum to form the anterior lobe of the pituitary.
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From where do heart tubes arise?

From mesodermal blood islands that have fused.

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