In the spinal cord, unlike the cerebrum, the grey matter
Correct answer: A. lies on the inside and the white matter surrounds it
- A. lies on the inside and the white matter surrounds it
- B. lies on the outside and the white matter is central
- C. is entirely absent
- D. contains only myelinated fibres
Explanation
The butterfly shaped core of grey matter contains the cell bodies and synapses, while the outer white matter is made of myelinated axons running up and down the cord, and myelin is what makes that region look white. In the brain the arrangement is inverted, with the grey cortex outside. Recognising the pattern is how a spinal cord section is identified under the microscope.
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About Reflexes and the Reflex Arc
A reflex arc shows how a rapid, automatic response travels from a receptor through a sensory neuron, relay neuron and motor neuron to an effector. The topic covers synapses, the spinal cord's role, and the difference between an involuntary reflex action and a slower voluntary response.
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