NURS 5301 Module 11 Question Bank

Chapter 15: Structure and Function of Neurologic System Which structure is part of the central nervous system (CNS)? Brain Correct The brain is part of the CNS. The peripheral nervous system (PNS) consists of the cranial nerves and the spinal nerves. The PNS can be divided into the somatic nervous system and the autonomic nervous system. Which is an insulating substance for the neuron? Myelin Correct Myelin is an insulating substance. The neurilemma is the same as a Schwann sheath; it is the delicate tissue that surrounds each axon. The nodes of Ranvier are interruptions at regular intervals that occur in the myelin. Which neurons transmit impulses from neuron to neuron? Interneurons Correct Interneurons, or associational neurons, transmit impulses from neuron to neuron. Motor neurons transmit impulses away from the CNS. Sensory neurons carry impulses from the peripheral sensory receptors to the CNS. Unipolar neurons have one process that branches shortly after leaving the cell body. Which term describes successive, rapid impulses received from a single neuron on the same synapse? Temporal summation Correct Temporal summation refers to the effects of successive, rapid impulses received from a single neuron on the same synapse. Spatial summation refers to the combined effect of impulses from a number of neurons on a single synapse at the same time. Facilitation refers to the effects of excitatory postsynaptic potential (EPSP) on the plasma membrane potential. Convergence refers to a number of neurons firing and converging on one neuron. Which is a component of the midbrain? Tegmentum Correct The tegmentum, corpora quadrigemina, and cerebral peduncles are parts of the midbrain. The cerebral hemispheres make up the forebrain. The brainstem is composed of the midbrain, medulla oblongata, and pons.