Developmental Biology
Developmental Biology
11th Edition
ISBN: 9781605354705
Author: Scott F. Gilbert, Michael J. F. Barresi
Publisher: Sinauer Associates is an imprint of Oxford University Press
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Chapter 15, Problem 9DQ
Summary Introduction

To review:

The role played by the target-specifying signals in guiding the synapse remodeling, later in life.

Introduction:

Synapse is defined as a specialized junction formed by the axon with its target (either a muscle cell or another neuron). The presynaptic neuron releases the chemical neurotransmitter which depolarize or hyperpolarize the membrane of postsynaptic cell (target cell). The formation of the synapse is regulated by a number of factors, and involves several steps. The studies based on mammalian development shows that all muscles are innervated by at least two axons. The accumulation of neurotransmitter containing synaptic vesicle in axon terminal, leads the filling of synaptic cleft by an extracellular matrix containing a specific form of laminin. This laminin may acts as a “stop signal” for further axonal growth. Neuron to neuron synapse is regulated by several signals like N-cadherin, neurotrophin etc.

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