関連ワード:
what is the spinal column made up of what is the spinal cord made up of what is the vertebral column made up of what tissue is the spinal cord made up of what type of tissue is the spinal column made up of what is the brain and spinal cord made up of what is the backbone made up of is the spinal cord made up of neurons is the spinal cord made up of nerves is the spinal cord made up of nervous tissue
