Sensory Perception Flashcards
What are the 4 main types of sensory receptors ?
Pacinian corpuscle Meissners corpuscle Merkels disc Ruffini endings
What contains free nerve endings that can respond to both touch and temperature ?
Smooth and hair skin
What are the somatic senses ?
Mechanoreceptive Thermoreceptive Pain
What is sensory transduction?
The process by which the properties of the environment become encoded as nerve impulses
What is the two point discrimination?
The distance between two points on the skin which can be detected as separate stimuli
What does two point discrimination test depend on?
Density of touch receptors Size if their receptive fields
The finer the discrimination
The higher the density of receptors and the smaller the receptive field
Where can the receptive field be larger?
Neck Thigh Back or calf
What are different sensory receptors innervated by?
Different types of nerve fibers
IA
Primary receptors of muscle spindle
Ib
Golgi tendon organ (change in muscle stretch)
II
Secondary receptors of muscle spindle (info about still muscle) All cutaneous mechanoreceptors (touch, pressure)
III
Free nerve endings of touch and pressure Nociceptors of neospinothalamic tract Cold thermoreceptors (temperature)
IV
Nociceptors of paleospinothalamic tract (pain) - warmth receptor (temperature)
When a sphygmomanometer cuff is inflated around the arm, where are local pressure transmitted to?
Ulnar Radius and median nerves - reversibly block the axons
