Review Questions, Introduction to Nervous System
Introduction to the Nervous System: Review questions
1. A dermatome:
Is a term describing the thickness of the dermis
Refers to the region of distribution of a named cutaneous nerve
Refers to an area of skin supplied by nerve fibers arising within a single dorsal root ganglion
Is a specialized area of skin occurring only on the trunk of the body
None of the above
2. Regarding spinal nerves:
Once formed, they usually begin branching while still within the vertebral canal
Each is very different so that there is no typical pattern
The eighth pair of thoracic nerves exits between thoracic vertebrae T8 and T9
The first pair (cervical 1) exits between the first and second cervical vertebrae
All spinal nerve roots are equal in length
3. Which of the following structures, if lesioned, would cause the greatest functional deficit?
A dorsal root
A ventral root
A spinal nerve
A spinal ganglion (dorsal root ganglion)
An anterior primary ramus
4. Upon examination of a patient you determine that a peripheral nerve has been lesioned. Which of the following are TRUE regarding peripheral nerves?
They contain fibroblasts and connective tissue fibers
When transected, their axons undergo degeneration distal to the site of injury
They lack a blood supply
A, B, and C are correct
A and B only are correct
5. Ganglia:
Are found only on dorsal roots of the spinal nerves T1-T12
That are sensory in function are usually located outside of the vertebral canal
Are swellings on dorsal primary rami
Are sites of synapses of axons carrying impulses to the central nervous system
None of the above
