Reflexes Flashcards
Sensory Modality
Type of stimulus activating a particular receptor
touch, pressure, pain, temperature, light
Adequate Stimulus
Type of energy a receptor normally responds to
Causes a generator potential (mVolts)
Mechanoreceptors
Adequate Stimulus - Pressure, Stretch, Deformation
Activates Stretch-Sensitive ion channels causing ion flow across the membrane
Respond to mechanical stimuli
Proprioceptors
Mechanoreceptors in joints and muscles
Signal Body, Limb position and movement in space
Control Voluntary Movement
Nociceptors
Pain (Noxious) Stimuli - Tissue damage and heat
Free Nerve Endings
Transduction in Sensory Receptors involves?
Opening or Closing Ion Channels
Pacinian Corpsule
Senses Vibration
Ruffini Corpsule
Skin Stretch
Merkel Receptors
Sense steady pressure and texture
Meissners Corspule
Respond to flutter and stroking movement
Mechanoreceptor Adaptation
Respond only to change or novel event
Signal the onset of stimulus
Rapidly Adapting Receptors
Pacinian corpuscles
Meissner corpuscles
Slowly Adapting Receptors
Merkel’s Disks
Ruffini Endings
Non Adapting Receptors
Nociceptors - free nerve endings
Its Important not to ignore painful stimuli
Pacinian corpuscle Structure
A myelinated nerve with a naked nerve ending enclosed by a connective tissue capsule of layered membrane lamellae separated by fluid