Flashcards in Exam 7 Special Senses 70X Deck (50)
What is the conscious or subconscious awareness of external or internal stimuli?
Impulses that reach the thalamus provide what type of awareness of the sensation?
Crude awareness of location and type of sensation
Impulses that reach the cerebral cortex enable type of awareness of the sensation?
Precise location of the stimulus, as well as type of stimulus
What is the conscious awareness and interpretation of the meaning of sensations?
There is no perception of sensory impulses that do not reach what?
Thalamus and cerebral cortex
What is a sensory modality?
Unique type of sensation:
An individual sensory neuron will carry information for how many modalities?
Only ONE type of Modality
What are the two classes the sensory modalities are grouped?
What senses are included into the General Senses class?
What modalities are included in the General Senses class?
-Tactile Sensations: Touch, Pressure, Vibration, Itch, Tickle
-Thermal Sensations: Warm, Cold, Hot
-Dynamic Sensations: movements of limbs and head
What sensation provides information about conditions within internal organs?
Visceral Sensations (of the General Sense Class)
Visceral sensation is usually not appreciated at what level of awareness?
Conscious level of awareness (other than as "feeling good" or "feeling bad")
What modalities are included in the Special senses class?
What are the two different kinds of graded potentials that are produced by sensory receptors?
(Amplitude of both types varies directly w/intensity of stimulus)
Generator potential are produced by dendrites of what?
-Free Nerve Endings
-Encapsulated Nerve Endings
-Receptive Part of Olfactory Receptors
Most sensory receptors exhibit ADAPTATION, which refers to what?
Decrease in generator potential or receptor potential amplitude when exposed to continuous constant stimulus over a long term
What causes the perception of a sensation to fade or disappear, even though the true magnitude of the stimulus has not changed?
Adaptation (of sensory receptors)
What receptors are rapidly adapting receptors and quickly stop firing in response to a constant stimulus?
What receptors are slowly adapting receptors and continue to fire in response to constant stimulus?
What type of sensation arises from stimulation of sensory receptors embedded in the skin or subcutaneous layer, mucous membranes, muscles, tendons, joint, and inner ear.
Somatic sensations that arise from stimulating the surface of the skin are termed what?
What are the four modalities of Somatic Sensation?
What modalities are included in (or comprise) Tactile Sensations?
Tactile sensations arise to a great degree by activation of the same structural type of receptor, What type of tactile sensation stimulate Free nerve endings and Encapsulated Nerve Endings?
Free Nerve Endings:
Encapsulated Nerve Endings:
Touch sensations are usually due to stimulation of what?
Tactile receptors in the skin or subcutaneous layer
What kind of touch: is the ability to perceive that something has contacted the skin, but its location, shape, size, and texture can not be ascertained
Define: Fine Touch
Specific information about the location touched, and shape, size, and texture of the source of stimulation
What sensation is interpreted from sustained sensation felt over a larger area than touch occurring w/ deformation of deeper tissues than does touch? What does this mean for these receptors?
-Pressure receptors can be deeper
What receptors are free nerve endings found in every tissue of the body except the brain?