Lecture 29 Flashcards
What are the special senses?
- vision
- hearing
- taste
- smell
- vestibular (balance)
What are the somatic and visceral sensations?
- touch
- pain
- warm & cold
- body position
What are the 4 types of information that describes a sensory stimulus?
- modality
- intensity
- duration
- location
what is modality?
type of sensory receptor activated
What is intensity?
frequency of action potential firing in afferent neuron
What is duration?
duration of action potential firing in afferent neuron
What is location?
location of sensory receptor(s) activated, ‘mapped’ in brain
What is location?
location of sensory receptor(s) activated, ‘mapped’ in brain
Where in the brain is the primary somatosensory cortex?
The postcentral gyrus
What does the primary somatosensory cortex control?
sensation
conscious identification of what and where
What is the afferent pathway for touch and posture called?
Medial lemniscal pathway (or dorsal column)
What route do the neurons go to the brain in the medial lemniscal pathway?
Up and across
What are the fast neurons used in the medial lemniscal pathway called?
Ia sensory neurons
What is the afferent pathway for pain called?
Lateral spinothalamic pathway (dorsal column)
What route do the neurons take to the brain in the lateral spinothalamic pathway?
Across and up
