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Flashcards in 1.5 Sensory Receptors Deck (19):
1

Which types of neurones are unipolar or multipolar?

Unipolar - sensory
Multipolar - motor

2

Where are cell bodies of motor neurons and sensory neurons situated?

Sensory cell bodies - DRG
Motor cell bodies - spinal cord

3

Are the sensory neuron cell bodies found in the CNS?

somatic sensory afferent fibre cell bodies lie in the cns - spine

4

Are motor and sensory neurons myelinated?

Motor - myelinated
sensory - both myelinated and unmyelinated

5

What are the two classifications of peripheral nerves and for which nerves are they for?

Roman - only sensory
Letter - both motor and sensory

6

What happens to the diameter and speed of conduction when you go down both of the classifications?

Diameter decreases and velocity decreases

7

Name the classifications of nerves linked to; muscle spindle, golgi tendon organ, touch & pressure, pain & cold receptors, pain & temp.

Muscle spindle - Ia & Aalpha
Golgi tendon - Ib & Aalpha
Muscle spindle, touch and pressure - II & Abeta
Pain and Cold - III & Adelta
Pain & Temp - IV & C

8

Explain sensation and perception

Sensation - conscious or subconscious awareness of the environment
Perception - interpretation of the sensation

9

Name the 2 types of modalities

General and Special

10

What are the 2 types of general senses?

Visceral and Somatic

11

Name the three types of sensory receptors and explain them

Microscopic - free nerve endings etc.
Stimulus - mechano, chemo etc
Location - intero, extero & proprio

12

Hair follicle...

Unencapsulated, A beta/II, myelinated

13

meissner corpuscle...

Encapsulated, A beta/II, myelinated, tap flutter, 5 - 40 Hz

14

ruffini corpuscle ...

Unencapsultaed, A beta/II, myelinated, skin stretch and slippage

15

merkel cells...

Unencapsulated, A beta/II, myelinated, touch & pressure

16

Pacinian cells...

Encapsulated, myelinated, A beta/II, vibration, 60 - 300 Hx

17

Free nerve endings...

Nocireceptors,
A delta - myelinated, sharp pain, III
C fibre - unmyelinated, dull pain, IV

18

Why does coding of sensory information occur?

When the tonic firing changes - change of frequency/rate, duration of APs, or activation of another sensory receptor

19

Name the receptors which are Rapid acting and Slow acting

Rapid acting - large frequencies, transient, phasic or vibratory - messier and pacinian
Slow acting - change of intensity or duration - ruffini & merkel