10 Questions
What is the total number of pairs of spinal nerves?
31
How are the sensory and motor signals separated before entering the spinal cord?
Axons carrying sensory signals are separated from axons carrying motor signals before entering the spinal cord.
What type of neurons are associated with spinal (and cranial) nerves?
Unipolar neurons
What type of signals do sensory nerves transmit?
Sensory nerves transmit signals towards the CNS (afferent signals).
How are axons insulated in peripheral nerves?
Individual axons are insulated by myelin created by Schwann cells, preventing ion loss across the axolemma.
What are the three connective tissue layers that bundle axons into nerves?
The endoneurium, perineurium, and epineurium.
What is the route of sensory signals along a spinal nerve towards the spinal cord?
Sensory signals enter the back of the spinal cord via the dorsal root.
How do motor signals leave the spinal cord?
Motor signals leave the spinal cord via the ventral root.
What are the two types of sensory signals that enter the spinal cord, and how do they synapse onto neurons in the grey matter?
Somatic sensory signals from the skin and proprioceptors, and visceral sensory signals from internal organs. Both types synapse onto neurons organized into separate nuclei.
Where do somatic sensory signals synapse onto neurons in the grey matter of the spinal cord?
Somatic sensory signals synapse onto neurons in the somatic sensory nuclei in the dorsal horn of the spinal grey matter.
Test your knowledge about the conduction of signals along cranial and spinal nerves, including the categorization of spinal nerves, the separation of sensory and motor signals, and the characteristics of sensory neurons associated with spinal and cranial nerves.
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