Objectives 1. Define the two divisions of the nervous system. 2. List three general functions of the nervous system. 3. Discuss the cellular composition of the nervous system, including the following: Compare the structure and functions of the neuroglia and neuron. Explain the function of the myelin sheath. Explain how a neuron transmits information. 4. Describe the structure and function of a synapse. 5. Describe the functions of the four major areas of the brain and the four lobes of the cerebrum. 6. Describe how the skull, meninges, cerebrospinal fluid, and blood-brain barrier protect the central nervous system. Objectives 1. Define the two divisions of the nervous system. 2. List three general functions of the nervous system. 3. Discuss the cellular composition of the nervous system, including the following: Compare the structure and functions of the neuroglia and neuron. Explain the function of the myelin sheath. Explain how a neuron transmits information. 4. Describe the structure and function of a synapse. 5. Describe the functions of the four major areas of the brain and the four lobes of the cerebrum. 6. Describe how the skull, meninges, cerebrospinal fluid, and blood-brain barrier protect the central nervous system..