9. Origin of Spinal Nerve
Roots: Nerves start as two distinct roots: the dorsal (posterior) root, carrying sensory info to the spinal cord, and the ventral (anterior) root, carrying motor commands from the spinal cord. Emergence: These roots join to form a spinal nerve just outside the spinal cord. Exit Point: Each nerve exits the vertebral column through an opening called the intervertebral foramen, located between adjacent vertebrae (except the first cervical nerve).