Cutaneous Receptors Flashcards
Which areas of the hand are ruffini endings typically located?
Along the palmar folds of the hands as well as finger joints as these areas of skin typically stretch the most.
What type of tactile information do ruffini endings transfer?
Info regarding the shape of large objects grasped with entire hand as well as hand and finger mvmt when hand is empty.
Which layer of the skin are ruffini endings typically located?
The dermis.
RA2 receptor…?
Pacinian Corpuscle
What stimulus best activates ruffini endings?
Skin stretch
Which receptor type contributes towards braille?
RA1 meisner corpuscle
What stimulus best activates Meissner corpuscles?
Lateral motion
RA1 receptor…?
Meissner Corpuscle
What type of tactile information do merkel discs transfer?
Info regarding the shape, size, surface area and texture of objects.
SA1 receptor…?
Merkel Disk
How do Pacinian corpuscles contribute towards our sense of touch?
- Contribute towards our dynamic sensitivity of touch
- Filter + amplify high frequency vibrations of tactile stimuli - Allow us to feel the vibrations of handheld tools as they
move over object surfaces as if our own fingers were
touching the surface themselves
Which is the most sensitive mechanoreceptor?
Pacinian corpuscle
What stimulus best activates Pacinian corpuscles?
(High frequency) vibrations
Which layer of the skin are Pacinian corpuscles typically located?
Deep tissue of the dermis.
Which layer of the skin are Meissner corpuscles typically located?
The dermal papillae (close to the skin surface).
What stimulus best activates merkel disks?
Edges, points, corners…
What type of events do Meissner corpuscles detect?
Low-frequency and low-amplitude skin motion ie. hand motion over object surfaces.
SA2 receptor…?
Ruffini Ending
Which layer of the skin are merkel discs typically located?
The tips of epidermal sweat ridges.
Describe the receptive fields of Type I fibres.
- Small and highly localised
- Multiple spots of sensitivity which reflects axon branching
- High density in fingers
- Significantly smaller than most objects that hand touches
- Only detect small portion of objects
Define tactile acuity
The ability to resolve spatial details of textured surfaces.
Where is tactile acuity the highest?
In the fingertips where the receptive fields are the smallest.
