Multiple Choice
Which of the following correctly labels the part of a chemical synapse where neurotransmitters are released into the synaptic cleft?
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10. Cell Signaling
Introduction to Cell Signaling
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Neural tissue begins as a thickening of a portion of the ectoderm that overlies the ______.
A
yolk sac
B
notochord
C
somites
D
endoderm
Verified step by step guidance1
Understand the context of the question: Neural tissue development is part of embryology, which studies how tissues and organs form during early development. The question asks about the structure beneath the ectoderm that influences neural tissue formation.
Recall the process of neurulation: During early embryonic development, the ectoderm thickens to form the neural plate, which eventually folds to create the neural tube. This process is influenced by signals from underlying structures.
Identify the role of the notochord: The notochord is a rod-like structure derived from mesoderm. It plays a critical role in signaling to the overlying ectoderm to thicken and form the neural plate, initiating neural tissue development.
Eliminate incorrect options: The yolk sac is involved in early nutrient transfer, somites contribute to the formation of muscles and vertebrae, and the endoderm gives rise to internal organs like the gut. None of these directly signal the ectoderm to form neural tissue.
Conclude that the correct answer is 'notochord,' as it is the structure responsible for inducing the ectoderm to thicken and begin neural tissue development.
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