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1

what is a receptor?

peripheral ending of sensory neuron

2

what is a neural pathway?

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

3

how are pathways specific?

modality- eg. touch, pain, vision

4

where do neural pathways terminate?

particular areas of the brain-primary receiving areas

5

what's in a peripheral nerve?

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

6

what is the brachial plexus?

innervation of the upper limb
axillary
musculocutaneous
radial
ulnar
median

7

describe an A alpha axon

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

8

describe an A beta axon

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

9

describe an A delta axon

diameter 1-5
speed 5-30
pain/temperature

10

describe a C axon

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

11

describe the trigeminal nerve

ophthalmic branch & maxillary branch = sensory
mandibular branch = sensory & motor

12

what is mechanoreception?

touch

13

what is nociception?

pain

14

give the sensory pathway to the cerebral cortex

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

15

why is the brain image distorted?

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

16

what is stereognosis?

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

17

what is proprioception

perception of position and movement of the body
where body parts are w/o visual