Lecture 7: Spinal Cord Flashcards
What are the three types of pathways that bring information to the brain?
Conscious relay pathways
divergent pathways
Unconscious relay pathways
In both the CNS and PNS, the gray matter is responsible for housing what?
Neuron cell bodies
In both the CNS and PNS, the white matter is responsible for housing what?
Bundles of Axons
______ roots send information to the periphery (motor)
Ventral
_______ roots bring information into the spinal cord (sensory)
Dorsal
What are the levels of covering of the spinal cord from outside to inside?
Dura mater
arachnoid mater
Pia mater
What anchors the spinal cord to the sacrum?
Filum Terminale
DCML is responsible for what sensory information?
Discriminative touch and conscious proprioception
What are the primary neurons for DCML?
Dorsal Root Ganglion
What are the secondary neurons for DCML?
Lower medulla at nucleus gracilis or nucleus cuneatus
What are the third order neurons for DCML?
Thalamus at VPL nucleui
Where does the DCML cross?
Lower medulla as internal accurate fibers
What is the primary sensory cortex responsible for?
discriminates among the size, texture, and shape of objects
What is the somatosensory association areas responsible for?
analyzing information from the primary sensory area and the thalamus to provide stereognosis and memory of the tactile and spacial environment
If there is a lesion in the cerebrum, midbrain, pons, or upper medulla, what will the effect on discriminative touch and conscious proprioception be?
Contralateral loss
If there is a lesion in the lower medulla, what will the effect on discriminative touch and conscious proprioception be?
Ipsilateral loss
If there is a lesion in the spinal region, what will the effect on discriminative touch and conscious proprioception be?
Ipsilateral loss
If there is a lesion in the peripheral region, what will the effect on discriminative touch and conscious proprioception be?
Ipsilateral loss
Spinothalamic tracts are responsible for carrying what sensory information to CNS?
Discriminative pain, temperature, and coarse touch
The lateral spinothalamic tracts carry what sensory information?
fast pain, temperature
The anterior spinothalamic tracts carry what sensory information?
Crude touch
What are the primary neurons for ST tract?
Dorsal Root ganglion
What are the Secondary neurons for ST tract?
cell body at the dorsal horn
What are the third order neurons for ST tract?
Thalamus (VPL nucleus)
Where does the ST tract cross midline?
Within the spinal cord at the same level of entering
If there is a lesion in the cerebrum, midbrain, or upper pons what will the effect on discriminative pain, temperature and coarse touch be?
Entirely Contralateral loss
If there is a lesion in the lower pons and medulla, what will the effect on discriminative pain, temperature and coarse touch be?
Contralateral body and ipsilateral face
If there is a lesion in the spinal region, what will the effect on discriminative pain, temperature and coarse touch be?
contralateral loss one or two levels below the lesion (Lissauer’s marginal zone)
If there is a lesion in the peripheral region, what will the effect on discriminative pain, temperature and coarse touch be
Ipsilateral loss
Spinocerebellar tracts are responsible for what type of sensory information?
Unconscious proprioception
