Spinal Cord & tracts
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What is the spinal cord protected by?
meninges and its three layers
What is the only difference from the brain & dura matter?
dura matter does not attach to bone, it is surrounded externally by layer of cushioning fat called epidural space
White matter & gray matter
- white matter - transport to signal
- gray matter - integration site
known as sensory & motor pathways consisting of multineuron pathways connecting CNS to PNS
Ascending (sensory) pathway
has four main ascending tracts conducting afferent signals with two sending it to cerebral cortex (dorsal column & spinothalamic pathway) and two to cerebellum (posterior & anterior spinocerebellar pathways)
dorsal column pathway
carries signal of fine touch, pressure, & proprioception
carries signals of pain, temperature, deep pressure, & course touch
Posterior & anterior spinocerebellar pathways
carry subsconcious proprioception
Descending (motor pathways)
divided into pyramidal (corticospinal) tracts or all others with all these type of tracts cross over at some point
Pyramidal (corticospinal) tracts
control skill motor (precise movement) from brain
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