Sensory Receptors Flashcards
Define sensory modality
Type of stimulus activating a particular receptor - i.e. touch, pressure, pain, temp, light
Define an adequate stimulus
Type of energy a receptor responds to
Define membrane deformation
The adequate stimulus in cutaneous mechanoreceptors and proprioceptors
What is the receptors or generator potential
The adequate stimulus that causes a graded membrane potential
What is a mechanoreceptor?
Stimulated by mechanical stimuli - pressure, stretch or deformation
Detect many stimuli - hearing, balance, blood pressure and skin sensations of touch and pressure
What is a proprioceptor?
Mechoreaceptors in joint and muscles that signal info related to body or imm position
What are nociceptors?
Respond to painful stimuli - tissue damage and heat
What is a stimulus?
Cause of local current to flow to the part of the membrane with voltage-gated ion channels which generates APs
What is the frequenting of coding of stimulus intensity?
The larger the stimulus, the larger the receptor potential (graded) and the HIGHER THE FREQUENCY of APs in a sensory nerve
Pacinian corpuscle
Senses vibration
Ruffini corpuscle
Responds to skin stretch
Merkel receptors
Sense pressure and texture (near surface)
Meissner’s corpuscle
Responds to flutter and stroking movements
Name rapidly adapting receptors
Pacinian corpuscles and moisteners corpuscle
Name slowly adapting receptors
Ruffini coruspcle
