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Head & Neck Q3.1
Spinal Cord, Spinal Nerves, Meninges, and Spinal Tracts
| Question | Answer |
|---|---|
| Dura Mater | Dense, fibrous outer layer of meninges |
| Subarachnoid Space | Between pia and arachnoid mater; filled with CSF |
| Pia Mater | This innermost meninge |
| Conus Medullaris | Conical tapered terminal of the spinal cord |
| What is formed by the union of the dorsal and ventral rootlets? | Dorsal and Ventral Roots |
| At what spinal level does the spinal cord end? | L1 or L2 |
| Through what openings do the spinal nerves exit the vertebral column? | Intervertebral Foramen |
| Cauda Equina | Descending nerve rootlets below the end of the spinal cord |
| Cervical Enlargement | C5-T1 |
| Lumbosarcal Enlargement | L1-S4 |
| Pyramidal Decussation | Axons cross over at pyramids of medulla to supply contralateral side of body |
| Location of Upper Motor Neurons | Primary Motor Cortex |
| Location of Lower Motor Neurons | Ventral Horn |
| Homunculus | Distorted map of the body; illustrating either sensory or motor areas |