Sensory and Motor Sysytems Flashcards
(39 cards)
What are somatic senses?
The perception of physical sensations arising from the body’s surface or musculoskeletal system
What is the receptive field of sensory neurons?
The specific area of sensory space where a stimulus will alter the neuron’s activity
What do convergence receptive fields result in?
Two stimuli that are within the same secondary receptive field are perceived as single points
What do small receptive field result in?
Two stimuli activate seperate pathways to the brain resulting in two point discrimination
What are chemoreceptors?
Receptors that detect change in chemical composition
What are mechanoreceptors?
Receptors that detect pressure
What are photoreceptors?
Receptors that detect light
What are thermoreceptores?
Receptors that detect change in temperature
What are pacinian corposcle?
Sensory receptors in the skin that detects vibrations
What are merkel receptors?
Sensory receptors in the skin that detect steady pressure and texture
What are meissner’s corpuscle?
Sensory receptors in the skin that detect flutter and stroking movements
What are ruffini corpuscle?
Sensory receptors in the skin that detect skin stretch
What is noxious stimuli?
Strong, potentially damaging stimuli that results in pain
What detects hair movement?
Free nerve endings at the hair root
What is piezo2?
An excitatory ion channel gated by mechanical forces that detects changes in membrane tension
What type of ion channel is required for merkel receptors?
Piezo2
What temperature do cold receptors detect?
<37 degrees celsius
What temperature do warm receptors detect?
> 45 degrees celsius
What do temperature receptors rely on?
Transient receptor potential channels
What nerves sense pain?
Nociceptors which are free nerve endings
What tissue does not have pain receptors?
The nervous system
What type of fibre results in fast pain?
A delta fibres
What type of fibre results in slow pain?
C fibres
What type of fibre results in an itch?
C fibres in skin stimulated by histamine
