a. The stimulus is received by a receptor organ specific to that stimulus.
b. From the receptor organ, the stimulus is carried to the CNS by way of an afferent (sensory) neuron within the appropriate peripheral nerve. The cell body of this afferent neuron is located in the posterior root ganglion of a spinal nerve or the individual ganglion of a cranial nerve.
INTER = between
NUNCIA = messenger
d. In the spinal cord, the cell bodies of the efferent (motor) neurons make up the anterior column of the gray matter. In the brainstem, the motor neurons make up the individual nuclei of the cranial nerves. The axon of the motor neuron passes out of the CNS by way of the appropriate peripheral nerve. Command information is thus carried away from the CNS.
e. The information is then delivered by the motor neuron to the effector organ. Somatic motor neurons lead to striated muscle fibers, particularly in skeletal muscles. Autonomic (visceral) motor neurons lead to smooth muscle tissue, cardiac muscle tissue, or glands.
Was this article helpful?
This guide will help millions of people understand this condition so that they can take control of their lives and make informed decisions. The ebook covers information on a vast number of different types of neuropathy. In addition, it will be a useful resource for their families, caregivers, and health care providers.