Somatosensation Neuro

Front 1

Somatosensation, sensory receptors are ______ for a specific type of ________. List the 6 types of receptors.

Back 1

Sensory receptors are specialized for a specific type of stimulus:

Mechanoreceptors; Chemoreceptors; thermoreceptors; Nociceptors; Tonic receptors; phasic receptors

Front 2

Mechanoreceptors

Back 2

touch, pressure, stretch, vibration

Front 3

Chemoreceptors

Back 3

any chemical stubstance created in or outside body

Front 4

Thermoreceptors

Back 4

Hot/cold

Front 5

Nociceptors

Back 5

subset of each of the above that result in pain signal related to original stimulus

Front 6

Tonic receptors

Back 6

respond as long as stimulus is maintaind

Front 7

Phasic receptors

Back 7

adapt to constant stimulus and stop

Front 8

Cell bodies of peripheral sensory neurons are ______ the CNS--- in _________ or _________________

Back 8

Cell bodies of perheral sensory neurons are outside the CNS---in dorsal root (spinal cord) or cranial root ganglia (brain)

Front 9

Distal axon conduct messages from ______ to the _________.

Back 9

distal axon conducts messages from receptor to the cell body

Front 10

Proximal axons project from the _______ to the _____/_______.

Back 10

Proximal axon project from the cell body to the cord/brain stem

Front 11

Types of Fibers are classisified by ________. Name the Two fiber types and describe

Back 11

diameter; 1A- largest- faster and more myelinated

C- smallest- slower and less myelinated

Front 12

Cutaneous Innervation; What is a receptive field? Receptive Fields tend to be smaller ______ and larger _________. Greater density _______. Combination of smaller receptive fields and greater density of receptors distally allows for ______ __________.

Back 12

Receptive field- are of skin innervated by one neuron

distally; prox.; distally; 2-point discrimation (allow us to distinguish betw. two closely applied stimuli on a fingertip.)

Front 13

Skin Sensation; ________ fine touch is more discrimatory than ______ fine touch.

______ touch much more discrimatory than ____ touch or _____.

All fine touch is transmitted by ____ fibers.

Back 13

Skin Sensation; Superficial fine touch is more discrimatory than SubQ fine touch.

FIne touch much more discrimatory than course touch or pain.

All fine touch is transmitted by AB fibers.

Front 14

_______ touch, _____ and ________ all utilize free nerve endings in the skin.

All transmit their signal via ____ or ____ fibers.

Back 14

Course touch, nociceptors and thermoreceptors all utilize free nerve ending in the skin.

All transmit their signal via Ao or C fiber.

Front 15

Dermatome definition. and explain the exceptions to the the rule

Back 15

Dermatome- are of skin innervated by axons from cell bodies in a single dorsal root.

Exceptions are the bracial and lumbosacral plexus which are grouped by peripheral nerves

Front 16

Musculoskeletal; Intrafusal muscle spinal type ____ and ______.

Golgi tendon organ Type ___.

Joint receptors ______, ________, ______.

Back 16

Intrafusal muscle spinal type type Ia and Type II

Golgi tendon organ Type Ib

Joint receptors: ligament-Ib; Ruffini/paciniform-II; Free nerve- Ao & C

Front 17

Name Pathways to the Brain 3 types

Back 17

-Conscious relay

-Divergent

-Unconscious relay

Front 18

Pathways to the brain:

Info. from adjacent body parts are grouped together (hand, foot) in ___________.

_________pathways named for _____neurons and called ______ when the bundle of axons share common origin and termination.

Typically the ____ neuron in the spinothalamic pathways origniates in _______ and terminates in _______.

Back 18

Pathways to the brain:

Info. from adjacent body parts are grouped together (hand, foot) in conscious.

Projection pathways named for long neurons and called tract when the bundle of axons share common origin and termination.

Typically the 2nd neuron in the spinothalamic pathways origniates in spine and terminates in thalamus.