What parts of the spinal nerve are CNS (proximally)?
Dorsal and ventral roots
What does the ventral root contain?
What does the dorsal root contain?
What parts of spinal nerves are PNS (distally)?
Dorsal and ventral rami
What does the white matter of the SC contain?
Ascending and Descending tracts
What is in the grey matter of the sc?
Dorsal horn (sensory-gate theory of pain relief)
Lateral Horn (Cell bodies of preganglionic neurons (ANS)
Ventral Horn (cell bodies of Alpha motor neurons (Motor)
What is the order of the meninges?
Outermost (Dura Mater), Middle (Arachnoid), Innermost (Pia Mater)
What are segmental signs of SC damage?
Sensory loss in dermatomes at level of lesion only
Motor loss in myotome of lesion level only
Are dermatomes areas unto themselves?
No, there is a lot of overlap
What are signs of vertical tract lesions?
Loss of fxn. below lesion, sensory impairment, motor impairment
How common is anterior cord syndrome?
Very. It is caused by flexion & compression of neck such as in MVAs and diving accidents
What is anterior cord syndrome?
damage to anterior 2/3 sc (spinothalamic tract) and corticospinal
intact posterior sc (DCML)
What is a spinal nerve classified as?
CNS (encased in bone)
Is pain and temperature sensation affected with anterior cord syndrome?
Is touch and proprioception intact with anterior cord syndrome?
What is central cord syndrome?
Either a small or large lesion
Small lesion-loss of pain and temp AT level of lesion (seg. sign)
Large lesion- impaired motor function in UEs
What does the spinal nerve consist of?
all sensory and motor axons connected with a single segment of the cord
What is a syndrome?
A collection of S/S that occur together