Week 2 Sensory Mechanisms: Objective 1: how sensory receptors are stimulated, concept of receptive field, how CNS codes/interprets sensory information Flashcards
Five Sensory Receptor Types
Mechanoreceptors
Thermoreceptors
Nociceptors
Electromagnetic receptors
Chemoreceptors
- Mechanoreceptors
free and encapsulated endings receiving skin tactile sensibilities
Includes free and encapsulated endings receiving skin tactile sensibilities
Expanded tip endings
Merkel’s discs
Other variants
Encapsulated endings
Meissner’s corpuscles
Kraus’ corpuscles
- Mechanoreceptors
free and encapsulated endings receiving deep tissue sensibilities
Spray endings
Ruffini’s corpuscles
Encapsulated endings
Pacinian corpuscles
Nociceptors
free nerve endings responding to pain
Electromagnetic receptors
include rods and cones of the eye for vision
Chemoreceptors
Taste Smell Arterial oxygen Osmolarity Blood carbon dioxide Blood glucose, amino acids Fatty acids
Receptor Characteristics: differential sensitivity
receptors are very specific, nonresponsive to types of stimulus
Receptor Characteristics: modality
refers to each of the principal types of sensation
Receptor Characteristics Labeled line principle
refers to the specificity of nerve fibers for transmitting only one modality of sensation
Adaptation of receptors
All sensory receptors adaptor partially or completely when exposed to constant stimulus after a period of time
some receptors adapt to a far greater extend than others
Mechanisms of Stimulation for receptors
Mechanical deformation
Application of a chemical
temperature change
Electromagnetic radiation
Tonic Receptors: traits
Slow adapting
Detects continuous stimulus strength
transmits impulses as long as stimulus is present
Types of Tonic receptors
Muscle spindles golgi tendon organs macular vestibular receptors baroreceptors chemoreceptors
