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Updated: May 17, 2025
The two roots blend together within the spinal cavity to form a single nerve trunk, which passes out between the vertebræ. On the dorsal root of each spinal nerve is a small ganglion which is named, from its position, the dorsal-root ganglion. *Double Nature of Spinal Nerves.*—Charles Bell, in 1811, made the remarkable discovery that each spinal nerve is double in function.
If a pencil were placed over the ear, what portions of the brain would be above it and what below? Describe briefly the cerebrum, the cerebellum, the midbrain, the pons, and the bulb. Locate and describe the cortex. State purpose of the convolutions. State the general differences between the cranial and the spinal nerves. Locate and give the number of the dorsal-root ganglia.
*Spinal Nerves and Dorsal-root Ganglia.*—The spinal nerves comprise a group of thirty-one pairs, which connect the spinal cord with different parts of the trunk, with the upper, and with the lower extremities. Each nerve joins the cord by two roots, these being named from their positions the ventral, or anterior, root and the dorsal, or posterior, root.
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