Lec 6 - Sensory Pathways for Touch & Proprioception Flashcards
These are chemoreceptors that do smell and taste
Exteroreceptors
Chemoreceptors that detect pH in blood etc.
Interoreceptors
Hearing in color is called blank and is the crossing of sensory pathways
Synesthesia
Cutaneous receptors slide
Ok
These sensors in muscles sense tension/load
Golgi tendon organ
Sensory part of muscle that senses muscle length and proprioception
Muscle spindle
During isometric contraction, this is firing but this isnt
Gto, muscle spindle
During stretching, blank is firing but blank isnt
Muscle spindle, gto
Know the classifications of peripheral nerves table slide
Ok
Pathway with large, myelinated fibers like type 1a, b from proprioceptors and type 2 or Abeta for touch
Medial
Medial pathway transmit signals via blank
Posterior column medial lemniscus
Pathway with small finely myelinated like type Adelta for nociceptors and cold, also unmyelinated c fibers
Laterals
Posterior columns pathway slide
Ok
This is right behind medial lemniscus and is involved in vestibular pathway
Medial longitudinal fasciculus
Medial lemniscus includes sensory from the body below the blank
Rostral medulla
Rostral medulla and higher has medial lemniscus with sensory from blank
Body AND head
Medial lemniscus continues to the lateral thalamic sensory nucle:
VPL, VPM
“Posterior column-medial lemniscus” slide to see distribution of vpl and vpm
Ok
Primary somatosensory cortex brodmanns areas
3,1,2
Association somatosensory brodmanns areas
5,7
Secondary somatosensory brodmanns area
40
Brodmann locations slide
Ok
Cut spinal cord, we lose touch and proprioception blank
Ipsilateral
Stroke on left side of pons affecting medial lemniscus would cause touch and proprioception blank
Contralaterally
Medial lemniscus cross over in blank
Caudal medulla
Lesion in caudal medulla to medial lemniscus would cause blank
Ipsilateral
5
A… VPL does just body, VPM does head
Receptors encode these 4 features of the stimulus
Nature, location, intensity, duration
