Ascending And Descending Tracts

Question 1

Where do tracts of the conscious pathway go

Answer 1

Pass through thalamus and get to Cerebral cortex

Question 2

What are the ascending tracts

Answer 2

Lateral spinothalamic tract 
Ventral spinothalamic tract 
Posterior column 
Dorsal spinocerebellar 
Ventral spinocerebellar 
Spinoolivary

Question 3

Function of dorsal column

Answer 3

Conscious propioception like discriminatory touch ,vibration ,form recognition ,joints and muscles sensation

Question 4

Inputs of posterior column

Answer 4

Input : pacini and meissner corpuscle , joint receptos, mucle spindles, golgi tendon organ

Question 5

Where is the first order neuron of the posterior column located

Answer 5

In the dorsal root ganglion at all levels

Question 6

\ Where do ascending fibers of posterior column travel

Answer 6

Fasciculus in gracilis and fasciculus cuneatus

Question 7

Where do you find fasciculus a gracilis in the spinal cord

Answer 7

In the lumbar and sacral region

Question 8

Where do you find fasciculus cuneatus in the spinal cord

Answer 8

In upper thoracic and cervical

Question 9

Where are located the second order you one of the posterior column

Answer 9

In the gracile and cuneate nuclei of caudal medulla

Question 10

What fiber is formed by gracile and cuneate nuclei

Answer 10

Internal Arcuate fibers

Question 11

At which level does the posterior column decussate

Answer 11

In the medulla when internal arcuate fiber is formed

Question 12

What structure is formed after decussation of the internal arcuate fiber

Answer 12

Medial lemniscus

Question 13

Where does the medial leminscus ascends in the brainstem and where does it terminate

Answer 13

Contralateral brainstem and terminate in ventral posterolateral nucleus of thalamus

Question 14

Where are the third order neurons of the dorsal column located

Answer 14

In the ventroposterolateral nucleus of thalamus

Question 15

Where do the third order neurons of the posterior column project to

Answer 15

To the postcentral gyrus

Question 16

Function of posterior spinocerebellar tract

Answer 16

Unconscious propioception of muscle joint sense and pressure

Question 17

Where is the second order neuron of posterior spinocerebellar tract located

Answer 17

Nucleus dorsalis of clarke from t1 to l3

Question 18

Does the posterior spinocerebellar tract cross

Answer 18

no

Question 19

From where does the posterior spinocerebellar tract enter the cerebellum

Answer 19

Through inferior peduncl

Question 20

Function of ventral spinocerebellar tracts

Answer 20

Unconscious propioception to cerebellum from trunk upper and lower limbs

Question 21

Where do the first order nucleus of the ventral spinocerebellar tract end

Answer 21

Nucleus dorsalis

Question 22

Are second order neurons of the ventral spinocerebellar tract crossed

Answer 22

Yes

Question 23

From where do the central spinocerebellar tract neuron enter the cerebellum

Answer 23

Superior cerebellar peduncl

Question 24

Function of lateral spinothalamic tract

Answer 24

Mediate pain and temperature

Question 25

Where are the first order neuron of the lateral spinothalamic tract located

Answer 25

In the dorsal root ganglion

Question 26

Tract formed when ascending branhch of lateral spinothalamic forned

Answer 26

Posterolateral tract of lissauer

Question 27

Is the Lateral spinothalamic tract crossed and conscious

Answer 27

Yes

Question 28

Where do the second order neurons of the lateral spinothalamic tract end

Answer 28

Contralateral thalamus

Question 29

What is the function of the anterior spinothalamic tract

Answer 29

Light touch | pressure

Question 30

Where are the first order neuron of the anterior spinothalamic tract located

Answer 30

Dorsal root ganglion

Question 31

Where are the second order neuron of the anterior spinal ceramic tract located

Answer 31

Posterior grey horn in substantia gelatinosa where they cross

Question 32

Where do the second or the neuron of the anterior spinothalamic tract end

Answer 32

The ventral posterolateral tract of thalamus via posteiror limb of internal capsule and corona radiata

Question 33

What are lower motor neuron

Answer 33

Neurons of the interior gray horn of the spinal cord that innervate skeletal muscle

Question 34

What are the upper motor neuron

Answer 34

Urine from Supraspinal areas that are descending tracts

Question 35

What are the major descending pathways

Answer 35

``` Lateral corticospinal tract ventral corticospinal tract rubrospinal tract tectospinal tract Vestibulospinal tract reticulospinal tract Autonomic ```

Question 36

Function of corticospinal tract

Answer 36

Voluntary discrete skilled movement

Question 37

Function of Reticulospinal tract

Answer 37

Facilitate or inhibits voluntary movement or reflex activity

Question 38

Tectospinal tract function

Answer 38

Reflex postural movements in response to visual stimuli

Question 39

Rubrospinal tract function

Answer 39

Facilitate activity of flexor muscles and inhibits extensor muscle

Question 40

Vestibular spinal tract function

Answer 40

Inhibit flexor muscle | Facilitate extensor muscle

Question 41

Autonomy function

Answer 41

Visceral activity

Question 42

What are the tract part of the Piramidal system

Answer 42

Corticospinal tract

Question 43

Where do the fibers of the corticospinal tract originate from in the cortex

Answer 43

2/3 originate from precentral gyrus 1/3 originate from postcentral gyrus

Question 44

Number of axons per pyramids cells

Answer 44

About 1 million

Question 45

Percentage of myelinated axons in corticospinl meduulla

Answer 45

70

Question 46

75 to 90% of fibers of corticospinal tract decussate at spinomedullary junction and form

Answer 46

Lateral corticospinal tract

Question 47

Origin of rubrospinal tract

Answer 47

Red nucleus in midbrain

Question 48

Does the rubrospinal tract cross

Answer 48

Yes

Question 49

Origin of tectospinal tract

Answer 49

Superior colliculus of midbrain

Question 50

Where does the tectospinal tract cross

Answer 50

In the periaquaductal grey

Question 51

What happens if there’s acute lesions to the upper motor neuron

Answer 51

Transient spinal shock with flaccid paralysis, areflexa ,hypotonia

Question 52

What happens if there’s chronic lesions to the upper motor neuron

Answer 52

``` Spastic paralysis hypertonia reduction or loss of superficial abdominal and cremasteric reflex extensor toe response (babinski sign) Clonus ```

Question 53

Consequences of lesion to lower motor neuron

Answer 53

``` Flaccid paralysis areflexia Muscle atrophy Fasciculation Fibrilliatio ```