2

Question 1

what is a receptor?

Answer 1

peripheral ending of sensory neuron

Question 2

what is a neural pathway?

Answer 2

axons of sensory neurons enter CNS and connect to other neurons
neurons with same function are grouped into bundles(pathways)

Question 3

how are pathways specific?

Answer 3

modality- eg. touch, pain, vision

Question 4

where do neural pathways terminate?

Answer 4

particular areas of the brain-primary receiving areas

Question 5

what’s in a peripheral nerve?

Answer 5

some contain sensory axons only, other have both motor and sensory

Question 6

what is the brachial plexus?

Answer 6

innervation of the upper limb
axillary
musculocutaneous
radial
ulnar
median

Question 7

describe an A alpha axon

Answer 7

large diameter 13-20 microm
fast conduction (80-120m/sec)
innervates muscle

Question 8

describe an A beta axon

Answer 8

diameter 6-12
conduction fact but slower than alpha (35-75 m/sec)
mechanoreceptors in skin

Question 9

describe an A delta axon

Answer 9

diameter 1-5
speed 5-30
pain/temperature

Question 10

describe a C axon

Answer 10

diameter 0.2-1.5
speed 0.5-2
dull, ache pain
itch, temperature

Question 11

describe the trigeminal nerve

Answer 11

ophthalmic branch & maxillary branch = sensory

mandibular branch = sensory & motor

Question 12

what is mechanoreception?

Answer 12

touch

Question 13

what is nociception?

Answer 13

pain

Question 14

give the sensory pathway to the cerebral cortex

Answer 14

primary sensory pathway
-periphery
secondary sensory pathway
-CNS
tertiary sensory neuron
-thalamus

Question 15

why is the brain image distorted?

Answer 15

areas with high density of receptors (small receptive field) are represented more widely in the cortex

Question 16

what is stereognosis?

Answer 16

ability to recognise objects by feel alone
requires:
3D mental image +
previous experience
=memory
co-ordinated cortical processing

Question 17

what is proprioception

Answer 17

perception of position and movement of the body

where body parts are w/o visual