Question

Externally, the ____ is covered by three membranes dura matter, arachnoid and pia matter.

• A. spinal cord
• B. cerebrum
• C. cerebellum
• D. none of the above

Answer 1

The correct option is A

spinal cord

Externally, the spinal cord is covered by three membranes dura matter, arachnoid and pia matter in continuation with those of the brain.

The spinal cord is a long, fragile tubelike structure that begins at the end of the brain stem and continues down almost to the bottom of the spine. Like the brain, the spinal cord is covered by three layers of tissue (meninges). The spinal cord and meninges are contained in the spinal canal, which runs through the center of the spine. In most adults, the spine is composed of 26 individual back bones (vertebrae). Just as the skull protects the brain, vertebrae protect the spinal cord.