The neurons entering the spinal cord from the periphery differ from neurons in the brain in that:
A)They can be as much as a meter in length
B)They are not myelinated
C)Neurons in the brain are generally sensory while those in the spinal cord are generally motor
D)They are usually bipolar cells

Question

Quizplus · Accepted Answer

Neurons entering the spinal cord from the periphery, such as those originating in sensory receptors, can be very long and extend as far as a meter from their cell body to their axon terminal. This is necessary to convey information from the periphery (such as the skin or muscles) to the spinal cord and then to the brain. Neurons in the brain, on the other hand, are typically shorter as they usually only need to communicate with other neurons within the brain itself.

Option B is incorrect as neurons entering the spinal cord from the periphery can be myelinated, especially those involved in transmitting sensory information.

Option C is incorrect as both the spinal cord and brain contain both sensory and motor neurons.

Option D is incorrect as bipolar cells are a specific type of neuron in the retina of the eye and are not typically found in the spinal cord.

The Neurons Entering the Spinal Cord from the Periphery Differ