Chapter 12 Test Review- The Spinal Cord Flashcards
External anatomy of the spinal cord
Spinal meninges Subarachnoid space Subdural space Epidural space Enlargements
Spinal meninges
Continuous with the brain
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Epidural space
Dura mater
(Subdural space)
Arachnoid mater
(Subarachnoid space CSF-lumbar puncture)
Pia mater
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Enlargements
Cervical and lumbar
Central canal
Ependymal canal
Cerebrospinal fluid filled space that runs along the entire length of the spinal cord
Conus medullaris
Tapered, lower end of the spinal cord
Cauda equina
Collection of nerves near the first lumbar vertebra
Filum terminale
Extension of the pia mater that extends from the terminal end of the spinal cord to the tailbone
Spinal cord regions
31 segments
8 Cervical 12 Thoracic 5 Lumbar 5 Sacral 1 Coccygeal
Arrangement of gray matter/horns
Butterfly shaped- grey commisure surrounds the central canal
Larger posterior horns
Shorter anterior horns
Lateral horns- small projections between anterior and posterior horns
Lateral grey horns
Contain cell bodies of motor neurons
Posterior grey horns
Contain cell bodies of sensory neurons
Arrangement of white matter/funiculi/tracts
White matter surrounds the grey matter
Funiculi contain the axons of ascending/sensory and defending/motor tracts that carry stimuli to and from the brain
Formation of a spinal nerve
Mixed nerve
Combination of nerve fibers from its dorsal and central roots
Role of CNS in sensations
Somatic sensory pathways from sensory receptors located in skin, muscles, joints, special sensory organs.
Second order neurons carry sensations to the thalamus, third order neurons carry sensations to the sensory brain cortex
The role of CNS in voluntary movement
Somatic motor pathways from brain through spinal cord is to skeletal muscles
Cell body of upper motor neuron lies in the primary motor cortex, sends messages to the effectors (muscles)
