Neuro 2: Ascending Tracts Of The Cns

Front 1

Name the 2 major ascending tracts

Back 1

Dorsal column-Medial Lemniscal and Spinothalamic

Front 2

What is the tract for pain and temp?

Back 2

Spinothalamic

Front 3

What is the tract for touch, vibration and proprioception?

Back 3

Dorsal column-medial lemniscal system

Front 4

Where do small fibers of a primary afferent in the ascending pathway synapse?

Back 4

Lateral division

Front 5

Where do large fibers of a primary afferent in the ascending pathway synapse?

Back 5

Medial division

Front 6

Where do the small fibers of primary afferent neurons enter the lateral division of the dorsal root?

Back 6

Lissauer's tract (Dorsolateral fasciculus)

Front 7

Where do the large fibers of primary afferent neurons enter the medial division of the dorsal root?

Back 7

Dorsal columns

Front 8

When the primary afferents bifurcate to form ascending and descending branches, what do the descending branches do?

Back 8

Short, reflexes

Front 9

Is a given primary afferent dedicated to a particular tract or pathway?

Back 9

NO

Front 10

The dorsal column-medial lemniscal and spinothalamic system carry ____ info to ____awareness.

Back 10

Sensory info to conscious awareness

Front 11

What defecit would you see with a spinothalamic lesion?

Back 11

Loss of pain and temp sensation

Front 12

What would the laterality of deficits be with damage to the spinothalamic system?

Back 12

Contralateral to lesion

Front 13

What level would you see defecits (If lesion is T5) in spinothalamic system lesions?

Back 13

T7 and below (2 segments below lesion)

Front 14

What descending analgesic pathway can block trasmission of the spinothalamic in the dorsal horn?

Back 14

Raphe Spinal Tract

Front 15

Where do the spinoreticular and spinomesencephalic (spinotectal) tracts revceive their input and where do they travel?

Back 15

Receive input from same small diameter primary afferents as spinothalamic and travel in teh anterolateral column ipsilateral and/or contralateral to side of origin

Front 16

What tract is involved in the indirect transmisson of pain and visceral sensation to thalamus and cerebral cortex? (supplements the spinothalamic)

Back 16

Spinoreticular tract

Front 17

What tract is important in the Ascending reticular activating system (ARAS) that influences the level of consciousness?

Back 17

Spinoreticular tract

Front 18

What is the level of decussation for the spinothalamic tract?

Back 18

Secondary axon decussates in SPINAL CORD

Front 19

What is the level of decussation for the DCML?

Back 19

Secondary axon decussates in the MEDULLA

Front 20

What tract receives input from sensory receptors like Meissner's corpuscles (tactile), Hair follicle endings, Pacinian corpuscles (vibration) and Muscle spindles?

Back 20

DCML

Front 21

Where does the f and n gracilis receive input from?

Back 21

Mid thoracic levels and below

Front 22

Where does the f and n cuneatus receive input?

Back 22

Mid thoracic levels and above

Front 23

Where would you find F. Gracilis?

Back 23

All levels of the SC

Front 24

Where would you find F. Cuneatus?

Back 24

Upper thoracic and cervical levels only

Front 25

Deficits associated with damage to the DCML would include what?

Back 25

Loss of discriminative touch, conscious proprioception and vibration sense

Front 26

Where would the level of deficit be in a DCML lesion?

Back 26

Below the level of the lesion

Front 27

What is the laterality of a DCML deficit if the lesion is in the SC?

Back 27

Ipsilateral (Before decussation)

Front 28

What is the laterality of a DCML deficit if the lesion is above n. gracililis and n. cuneatus?

Back 28

Contralateral (After the decussation)

Front 29

What type of proprioception takes place in the spinocerebellar system?

Back 29

Unconscious

Front 30

Although it is considered sensory, which system of tracts is intimately associated with motor control?

Back 30

Spinocerebellar

Front 31

Where does the spinocerebllar system receive input?

Back 31

From large diameter primary afferents (Same as DCML)

Front 32

Where do the primary afferents of spinocerebellar system segregate?

Back 32

Medial division of dorsal root (same as DCML)

Front 33

What spinocerebellar tract receives input from the upper extermities?

Back 33

CCT (equivalent of DSCT)

Front 34

Where do the DSCT and VSCT have their primary axon bodies?

Back 34

F. Gracilis

Front 35

Where is the secondary cell body of the DSCT?

Back 35

Clarks nucleus (N. dorsalis)

Front 36

Where is the secondary cell body of the VSCT?

Back 36

Base of dorsal or ventral horn

Front 37

Which spinocerebellar tract crosses and where does it cross?

Back 37

VSCT; in spinal cord and re-crosses in cerebellum

Front 38

Where does the DSCT enter the cerebellum?

Back 38

Inferior cerebellar peduncle

Front 39

WHere does the VSCT enter the cerebellum?

Back 39

Superior Cerebellar peduncle

Front 40

Lesion of what spinocerebellar tract would produce motor incoordination (ataxia)?

Back 40

Inferior Cerebellar Peduncle (DSCT and CCT)

Front 41

How many major neurons in the spinocerebellar tracts?

Back 41

2

Front 42

Where do many large diameter primary afferents have input?

Back 42

DCML and SCT, CCT, and VSCT (conscious and unconscious)

Front 43

What sides do the cerebellum and cerebral cortex deal with?

Back 43

Ipsilateral (cerebellum) and contralateral (cortex)