Senses and Perception 2

Question 1

receptors

Answer 1

peripheral endings of sensory neurons

Question 2

A - alpha nerve fibres

Answer 2

large diameter and thick myelin sheath - fastest conduction speed
carry info relating to proprioception (awareness position and movement of body) of skeletal muscle

Question 3

A - beta nerve fibres

Answer 3

still very fast conduction

carry info related to touch (mechanorecpetion)

Question 4

A - delta nerve fibres

Answer 4

small. diameter axon and thin myelin sheath

carry info relating to pain and temperature

Question 5

C nerve fibres

Answer 5

no myelin sheath

info regarding pain temperature and itch

Question 6

where are the cell bodies of first order sensory axons located

Answer 6

dorsal root ganglion (DRG)

Question 7

what root do sensory axons enter the CNS via

Answer 7

dorsal root

Question 8

what root do ventral axons leave the CNS via

Answer 8

ventral root

Question 9

what is the basic pathway template

Answer 9

(stimulus) 
primary neuron (in periphery projects into CNS) 
secondary neuron (CNS) 
tertiary neuron (thalamus - cerebral cortex)

Question 10

what is the pathway for somatic mechanoreception called

Answer 10

dorsal column medial lemniscus pathway

Question 11

what is the pathway for somatic nociception called

Answer 11

spinothalamic pathway

Question 12

what is the pathway for mechanoreception of the trigeminal nerve called

Answer 12

posterior (dorsal) trigeminothalamic tract

Question 13

what is the pathway for nocicpetion of the trigeminal nerve called

Answer 13

anterior (ventral) trigeminothalamic tract

Question 14

stereognosis

Answer 14

ability to recognise objects by their fell alone

requires memory to provide a mental 3D image

Question 15

proprioeption

Answer 15

allows us to appreciate where our body parts are without visual assistance
involved in bite force, balance and posture