Somatosensation Part 2

Front 1

All 4 types of sensation reach the _______. Name the 4 types of sensation

Back 1

mcortex; touch, proprio, pain, temp

Front 2

Pathways involve _____ projection neron via two routes: __________ and ____________. Also explain the routes.

These pathways carry ______ sensation. Which passes through ________ but is not _____ until it reaches the _______.

Back 2

3; Dorsal columns-discriminative touch and proprioception

Anterolateral tracts-discrimative pain and temperature

These pathways carry discrimatory sensation:

Passes through thalamus but is not discriminated until it reaches the cortex

Front 3

Dorsal Column/Medial Lemniscus

Stimulation of receptors at the distal end of the primary neuron conveyed to the cell body in the _______________ then ascends to _________.

Axons in Lower limb are _____ in dorsal column. Called _________.

Axons in Upper Limb are ______ in dorsal column. Called __________.

Back 3

Stimulation of receptors at the distal end of the primary neuron conveyed to the cell body in the dorsal root ganglion then ascends to ipsilat.

Axons in Lower limb are medial in dorsal column. Called fasiculus gracilis.

Axons in Upper Limb are lateral in dorsal column. Called fasiculus cuneatus.

Front 4

Dorsal Column/Medial Leminscus

Trace the pathway from primary neuron to cortex.

Back 4

Primary neuron---> dorsal root ganglion---->ascends ipsilaterlly---->synapse in medulla---->ascends to thalamus synapse----->cortex

Front 5

Somatotopic arrangement:

Ascending tracts are ________ as they ascend and _________ this organization through the ______ and _______ neurons.

Primary sensory cortex is arranged according to an organization called ____________.

Back 5

Ascending tracts are reorganized as they ascend and maintain this organization through the 2nd and 3rd neurons.

Primary sensory cortex is arranged according to an organization called homunculus.

Front 6

Anterolateral columns carry info. about ________ and ________ as well as ________ touch.

Several parallel tracts ascend in the anterolateral spinal cord. One of the tracts the spinothalamic tract is part of a _____ neuron ______ relay called ____________pathway. Most acend ___________.

Back 6

Anterolateral columns carry info. about discrimatory pain and temp as well as course touch.

Several parallel tracts ascend in the anterolateral spinal cord. One of the tracts the spinothalamic tract is part of a 3 neuron conscious relay called spinothalamic pathway. Most acend contralaterally.

Front 7

Spinothalamic tact

Temperture:

Cold: ____ Fibers

Hot: ____ fiber

First synapse in __________.

Second order cross ____ and ascend _____ to the _________.

Third order ascend to _______.

Back 7

Spinothalamic tact

Temperture:

Cold: Ao Fibers

Hot: C fiber

First synapse in dorsal horn.

Second order cross midline and ascend contralaterally to the thalamus.

Third order ascend to cortex.

Front 8

Spinothalamic tract does diciminative _____ and Pr_______. Primary fibers is ____ for fast pain.Primary fiber often branch to several ____ in spinal cord.

Back 8

Spinothalamic tract does discriminative pain adn temp. Primary fiber is Ao for fast pain. Primary fiver often branch to several levels in spinal cord.

Front 9

So Spinothalamic tract does _______ pain and Divergent pathways does _________ pain. Not a typical ____ neuron pathway like conscious pathway. Not ______ organized therefore cannot be ________.

First neuron ______ fiber.

Highly ______ after injury.

Back 9

So Spinothalamic tract does fast pain and Divergent pathways does slow aching pain. Not a typical 3 neuron pathway like conscious pathway. Not somatotopically organized therefore cannot be localized.

First neuron C fiber.

Highly sensitized after injury.

Front 10

Divergent-

Ascending Projections recieve info. from _________, _________ and ________ receptors.

May be modified by larger _______ or by decending _______ control. What are the 3 parallel acending pathways and explain them.

Back 10

Ascending Projections recieve info. from cutaneus, musculoskeletal and visceral receptors.

May be modified by larger afferent or by decending central control. What are the 3 parallel acending pathways and explain them.

-Spinomesencephalic-carry pain fiber that activate turing head and eyes toward noxious stimulus

-Spinoreticular-motivational, affective, autonomic and aversive response aspects of pain

-Spinolimbic-slow, dull pain

Front 11

Unconscious Relay (spinocerebellar) tract are made up of what 4 parts?

Back 11

Posterior spinocerebellar

Cuneocerebellar

anterior spinocerebellar

Rostrocerebellar

Front 12

Unconsious relay- Posterior Spinocerebellar

Back 12

-legs and lower half of body

-first neuron synapse in dorsal column T or L spine and ascends ipsilaterally to cerebellum

(give info regarding muscle, tendon, joint)

Front 13

Unconsious relay Cuneocerebellar

Back 13

-Arms and upper half of body

-first neuron synapses in medulla

(give info regarding muscle, tendon, joint)

Front 14

Unconscious Relay- Anterior Spinocerebellar

Back 14

-info from T & L spine interneurons

-provide feedback of LE movements to both sides of cerebellum

Monitor descending motor, reflex, and motor interneuron activity

Front 15

Unconscious relay- Rostrocerebellar

Back 15

-infro from C spine interneurons

-Provide ipsilateral info

Monitor descending motor, reflex, and motor interneuron activity