Shared Flashcard Set

Details

BioPsych10
Somatosensory & Sensorimotor Systems
19
Psychology
Undergraduate 1
06/10/2010

Additional Psychology Flashcards

 


 

Cards

Term
somatosensory system
Definition
external and internal sensory information from your body to your brain
made of 3 systems: exteroceptive, proprioceptive and interoceptive
Term
exteroceptive system (somatosensory)
Definition
senses external stimuli applied to skin
(mechanical stimuli-touch, thermal stimuli-temperature, nociceptive stimuli-pain)
Term
proprioceptive system (somatosensory)
Definition
senses info about the position of the body from receptors in muscle, joints, and organs of balance (like ear)
Term
interoceptive system (somatosensory)
Definition
senses info about internal state of the body (temp/blood pressure/etc)
Term
free nerve endings
Definition
sense temperature change and pain
Term
pacinian corpuscles
Definition
largest/deepest receptors
-adapt rapidly
-sudden displacements of skin=touch
-do not notice clothes touching you!
Term
dorsal-column medial lemniscus sensory pathway
Definition
touch and proprioception
(decussate in hindbrain)
don't synapse until the medulla
Term
anterolateral sensory pathway
Definition
pain and temperature
(decussate in the cord)
synapse immediately
Term
spinothalamic tract (anterolateral system)
Definition
travel up the cord and into the thalamus
Term
spinoreticular tract (anterolateral system)
Definition
synapse in the hindbrain (reticular activating system)
then parafascicular nuclei and intralaminar nuclei in thalamus
Term
spinotectal tract (anterolateral system)
Definition
synapse in the tectum (colliculi-midbrain)
Term
dorsolateral corticospinal pathway (sensorimotor)
Definition
from motor cortex to the cord
decussates in the medulla
direct control over motor neurons of distal muscles
Term
dorsolateral corticorubral pathway (sensorimotor)
Definition
from motor cortex to red nucleus in midbrain to secondary neurons
decussates in the medulla
indirect control over motor neurons of distal muscles
Term
ventromedial corticospinal pathway (sensorimotor)
Definition
from the motor cortex to the cord
travels ipsilaterally
direct control over motor neurons of proximal muscles
Term
ventromedial cortico-brainstem-spinal system (sensorimotor)
Definition
from motor cortex to diffuse regions of the brainstem to secondary neurons
travels ipsilaterally
indirect control over motor neurons in proximal muscles
brainstem targets= tectum (auditory/visual info) vestibular nucleus (balance from ears) reticular formation (species-specific movements)
Term
spinal cord reflex
Definition
somatosensory input to motor neurons (can be one synapse-knee jerk/patellar reflex)
Term
brainstem reflex
Definition
visual, auditory input to motor neurons
(orienting reflexes-visual info to superior colliculi goes to primary motor neuron, auditory info to inferior colliculi goes to primary motor neuron)
Term
hierarchy of cortical sensorimotor processing
Definition
sensory cortices>association areas in parietal lobe(recognizes location of objects in environment)>dorsolateral PFC (decision to move)>secondary motor cortex(motor program)>primary motor cortex (muscle movement)
Term
sensorimotor system damage-association cortex
(parietal lobe and DLPFC)
Definition
parietal-apraxia (difficulty making specific movements when requested to do so) and contralateral neglect (inability to respond to stimuli on one side of the body opposite the lesion)
DLPFC-difficulty planning voluntary movements and poor decision making
Supporting users have an ad free experience!