Sensory Systems Flashcards
The two types of sensory neurons?
large and small
Large sensory neurons are part of the ….and small ones are part of the …
dorsal column medial lemniscal tract
anterior lateral spinothalamic system
3 Somatosensory neurons
first, second and third order
First order neurons are either …. or … neurons and their cell bodies are located outside CNS in ….
large or small
dorsal root ganglia
Second order neurons are located in the … or …
spinal cord (spinothalamic tract) or brain stem (dorsal column system)
Third order neurons are located in
thalamus
Dorsal column is responsible for …
2 point discrimination, vibration, proprioception and fine touch
First order neurons in DRG enter the spinal cord via dorsal root and ascend to form … and …
fasciculus gracilis and fasciculus cuneatus
Second order neurons in dorsal column tract cross the midline at the …. and …. nuclei for lower body and upper body respectively.
gracile and cuneate
Third order neurons in DRG axons project to 1 degree ipisilateral … cortex.
somatosensory
Spinothalamic Tracts (Anteriolateral) are responsible for…
pain, temperature and crude touch
The first order neurons in the DRG of spinothalamic tract enter spinal cord and ascend ….
ipsilaterally
The second order neurons in the dorsal horn of the spinothalamic tract cross to opposite side of the spinal cord to form….
anterior and lateral spinothalamic tract
Third order neurons in the …. of the spinothalamic tract project to somatosensory cerebral cortex on the ipsilateral side.
thalamus
Hyperalgesia
lowered threshold of peripheral nociceptors
Hypalgesia or Analgesia
reduced/relief from pain
Allodynia
central pain sensitization; pain response exaggerated from stimuli not normally painful
Referred pain of heart?
left arm/jaw
Referred pain of gallbladder?
right shoulder
Referred pain of pancreas?
center back
Referred pain of liver/gallbladder?
abdomen, upper right quadrant
Referred pain of spleen/thymus?
upper right shoulder at front/back of neck
Primary somatosensory cortex?
parietal lobe
Primary hearing cortex?
temporal
Primary visual cortex?
occipital lobe
Sensory association coretx
many domains
Optic chiasm fibers from..
retina decussate
Optic tract carries information from … visual field.
opposite
When there is injury in optic nerve what happens?
blind in one eye
When there is an injury in optic chiasm what happens?
tunnel vision
When there is an injury in the optic track what happens?
cant see on one side
When there is an injury in the lateral geniculate body?
cant see on one side
When there is an injury in the optic radiation what happens?
entire lose on one side
Pituitary tumor symptom?
tunnel vision
The reticular system regulates…
arousal and consciousness
Clinical associations with the reticular system?
syncope
coma
stupor
