Anatomy & Physiology Nervous #10


Which structure, along with the brain, is a major component of the central nervous system (CNS)?


  1. Spinal cord
    • Rationale:

      The spinal cord, along with the brain, are the two structures of the CNS.

  2. Cardiac muscle
    • Rationale:

      The cardiac muscle is not a structure of the CNS. Cardiac muscle tissue is an organized and specialized type of tissue that only exists in the heart.

  3. Endocrine glands
    • Rationale:

      The endocrine glands are not a structure of the CNS. The endocrine glands make hormones that are released directly into the blood and travel to organs and tissues all over the body.

  4. Neuromuscular junction
    • Rationale:

      The neuromuscular junction is not a structure of the CNS but a chemical synapse between motor neurons and muscle fibers. It allows the motor neuron to transmit a signal to the muscle fiber thereby causing a muscle contraction.


The nervous system has two primary branches, the central nervous system (CNS) and the peripheral nervous system (PNS).


Learning Outcomes

The primary structures of the CNS are the brain and spinal cord. The spinal cord acts as a route for axons to travel outside of the brain. The spinal cord serves as the center for reflexes that do not involve the brain.

Test Taking Tip

Consider the primary functions of the CNS to determine the structure that, along with the brain, make up this branch of the nervous system.

Video Rationale