Stimulus General sensory receptor structure > Layers of connective Enclosed nerve ending Encapsulated nerve endings dendrites with Myelinated axon special supporting Cell bod structures (mechanoreceptors and proprioceptors) Complex neural receptor
General sensory receptor structure • Encapsulated nerve endings: dendrites with special supporting structures (mechanoreceptors and proprioceptors)
Classification of Receptors 1. Location DExternoceptors Located on the body sur face or specialized to detect external stimul Pressure, pain, temp, touch, etc 2)Visceroceptors Located within internal organs, detect internal stimuli Blood pressure, pain, fullness 3)Proprioceptors Found in the joints and muscles Also in the vestibular structures and the semicircular canals of the inner ear. Limb and body position and movment
Classification of Receptors: 1. Location 1) Externoceptors Located on the body surface or specialized to detect external stimuli Pressure, pain, temp, touch, etc. 2) Visceroceptors Located within internal organs, detect internal stimuli Blood pressure, pain, fullness. 3) Proprioceptors Found in the joints and muscles Also in the vestibular structures and the semicircular canals of the inner ear. Limb and body position and movment
2 Modalities 1)Mechanoceptive Detects stimuli which mechanically deform the receptor Pressure, vibration, touch, sound 2) Thermoceptive Detects changes in temperature; hot/cold 3)Nociceptive(pain) Detects damage to the structures 4)Photoreceptors Detect light; vision, retinal of the eye 5)Chemoceptive Detect chemical stimuli; CO2 and O2 in the blood glucose, small taste
2 Modalities 1) Mechanoceptive Detects stimuli which mechanically deform the receptor; Pressure, vibration, touch, sound. 2) Thermoceptive Detects changes in temperature; hot/cold 3) Nociceptive (pain) Detects damage to the structures 4) Photoreceptors Detect light; vision, retinal of the eye 5) Chemoceptive Detect chemical stimuli; CO2 and O2 in the blood, glucose, small, taste
3. complexity 1)Simple receptors Usually a single modified dendrite General sense Touch, pressure, pain, vibration, temperature 2)Complexity High modified dendrites, organized into complex structures ear, eye Special senses Vision, hearing, smell, taste
3. Complexity 1) Simple receptors Usually a single modified dendrite General sense Touch, pressure, pain, vibration, temperature 2) Complexity High modified dendrites, organized into complex structures; ear, eye. Special senses: Vision, hearing, smell, taste
Sensation: Receiving messages Stimuli: What messages can be received? Anything capable of exciting a sensory receptor cell can be defined as stimulus Examples include: sound, light, heat, cold, odor, color, touch, and pressure
Sensation: Receiving messages • Stimuli: What messages can be received? – Anything capable of exciting a sensory receptor cell can be defined as a “stimulus” – Examples include: sound, light, heat, cold, odor, color, touch, and pressure