BMC L7 Flashcards
State 4 types of sensory receptors
Temp
Mechanoreceptors
Chemical receptors
Nociceptors
State the general function of mechanoreceptros
Respond to pressure, stretch, vibration, distrotion
State the 5 types of mechanoreceptors
- Merkel cell
- Meissner corpuscle
- Pacinian corpuscle
- Free nerve endings
- Hair follicle
State the function of Merkel cells
Detect:
-Sustained pressure, static stimualtion
State the function of meissner corposcule
Detect:
light touch, slip, flutter
State the function of pacinian corposcule
Rapid vibrations
State function of free nerve endings
Touch, pressure, stretch, tickle, itch
State function of hair follicle
Detects Distortion of body hair
What are the 4 different nerve fibres
A-alpha nerve fibres
A-beta nerve fibres
A-delta nerve fibres
C nerve fibres
Recognise on diagram
State the function of A-alpha nerve fibres
Size: Large, INSULATED
Proprioception e.g. muscle reflex
State the function of A-beta nerve fibres
Medium, insulated
Proprioception - non-painful touch e.g. pressure
State the function of A-delta nerve fibres
Small, insulated
Fast tissue damage, pin prick, intense heat
State the function of C nerve fibres
Small, UNINSULATED
SLOW TISSUE DAMAGE, SLOW BURNS, ITCH
Explain the incidence and purpose of fast pain
Acute “sharp” - pin prick
Removes part of the organism from harm to PREVENT FURTHER DAMAGE
FAST PAIN ADAPTS, PAIN SUBSIDES - becomes less strong
A-delta nerve fibres
MYELINATED
Explain the incidence and purpose of slow pain
Chronic, more intense, slow burning etc
Debilitates organism until injury repais to prevent too much activity
LEADS TO HYPERALGESIA, increased sensitivity to pain, which leads to allodynia, where normal stimuli can be painful
C nerve fibres
Unmyelinated
State the 2 types of pathological pain
- Chronic
- Neuropathic