Relay neurons connect sensory neurons to motor neurons. Motor neuron sends electrical impulses to an effector. Effector produces a response (muscle contracts to move hand away). Organisms are able ...

Spinal muscular atrophy is caused by mutations in the survival motor neurons gene, SMN1. The SMN protein localizes to both the cytoplasm and the nuclear bodies. One hallmark of spinal muscular ...

A bundle of neurones is called a nerve. There are three main types of neurone: sensory, motor and relay. They have some features in common: A long fibre (axon) which is insulated by a fatty ...