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Head & Neck Q3.1

Spinal Cord, Spinal Nerves, Meninges, and Spinal Tracts

QuestionAnswer
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
Created by: enroth