Neuroanatomy Final Exam With Complete Solution
The lateral horn of the spinal cord is ONLY present in _______________- - ANSWER T1-L1
(sympathetic chain ganglion)
_________ are bundles of axons moving with the CNS - ANSWER fiber tracts
List all of the categories of fiber tracts - ANSWER - spinal tract (ascending and
descending)
- association fibers (within hemispheres)
- commissural fibers (btwn L and R hemispheres)
- projection fibers (ascending/ descending fibers w/in brain)
The ____________________ of the dorsal column is present above T7, while
_______________ is present throughout the spinal column. - ANSWER 1. fasciculus
cuneatas
2. fasciculus gracilis
- FC = upper extremity --> does not need nerve fibers past T7
- FG = lower extremity
What are the 3 major divisions of the white matter in the spinal cord? - ANSWER - dorsal
column (ascending tracts)
- lateral column (ascending and descending)
-anterior column-ascending and descending
Describe the distribution of blood supply to the spinal cord. - ANSWER - posterior spinal
artery-dorsal column
,anterior spinal artery-anterior and lateral columns-presents w more deficits-more
common
The ALS ascending tract is responsible for more ___________ sensations while the DCML
ascending tract is responsible for more _________________ sensations - ANSWER 1.
primitive-reflexive
2. advanced
Sensations of DCML tract- ANSWER - discriminative touch
- vibration
- proprioception
- light touch
Sensations of ALS tract- ANSWER - pain
- temperature
- crude touch (pressure/ large surface area)
What is the spinocerebellar system responsible for? - ANSWER - unconscious
proprioception (limb position, joint angle, muscle tone and length)
- cannot be tested clinically
What is the pathway of the DCML tract? -ANSWER sensory info --> dorsal root ganglion
--> dorsal horn --> DCML tract --> medulla (fibers cross sides to ML) --> VPL nucleus of
thalamus --> anterior internal capsule --> S1 cortex
The __________ spinothalamic is responsible for pain and temperature. -ANSWER lateral
The ___________ spinothalamic is responsible for ______ and ____________ -ANSWER
crude touch and firm pressure
, What is the course of the ALS tract? -ANSWER sensory information --> dorsal root
ganglion --> dorsal horn --> ALS tract (fibers cross) --> medulla, pons, midbrain --> VPL
nucleus in thalamus --> anterior internal capsule --> S1 cortex
Where are the 1st, 2nd and 3rd order neurons in the DCML Tract? -ANSWER 1st =
sensory receptors to medulla
2nd = medulla to thalamus
3rd = thalamus to S1 cortex
Where would the 1st, 2nd and 3rd order neurons be in the ALS tract? - ANSWER 1st =
sensory receptor to the ALS tract
2nd = ALS tract to thalamus
3rd = thalamus to S1 cortex
A patient presents with a lesion at the left fasciculus gracilis at T8. What would the
impairment? - ANSWER - loss of light touch, vibration, proprioception, in LEFT leg and
lower trunk.
A lesion of the right lateral spinothalamic tract at T7 in a patient would present what
impairment? - ANSWER - loss of pain and temperature on the LEFT side below the
lesion.
Draw a topographic map of the ascending tracts of the spinal cord. - ANSWER .
Name the descending pathways. - ANSWER - corticobulbar
- corticospinal
- corticopontine
- rubrospinal
- reticulospinal
The lateral horn of the spinal cord is ONLY present in _______________- - ANSWER T1-L1
(sympathetic chain ganglion)
_________ are bundles of axons moving with the CNS - ANSWER fiber tracts
List all of the categories of fiber tracts - ANSWER - spinal tract (ascending and
descending)
- association fibers (within hemispheres)
- commissural fibers (btwn L and R hemispheres)
- projection fibers (ascending/ descending fibers w/in brain)
The ____________________ of the dorsal column is present above T7, while
_______________ is present throughout the spinal column. - ANSWER 1. fasciculus
cuneatas
2. fasciculus gracilis
- FC = upper extremity --> does not need nerve fibers past T7
- FG = lower extremity
What are the 3 major divisions of the white matter in the spinal cord? - ANSWER - dorsal
column (ascending tracts)
- lateral column (ascending and descending)
-anterior column-ascending and descending
Describe the distribution of blood supply to the spinal cord. - ANSWER - posterior spinal
artery-dorsal column
,anterior spinal artery-anterior and lateral columns-presents w more deficits-more
common
The ALS ascending tract is responsible for more ___________ sensations while the DCML
ascending tract is responsible for more _________________ sensations - ANSWER 1.
primitive-reflexive
2. advanced
Sensations of DCML tract- ANSWER - discriminative touch
- vibration
- proprioception
- light touch
Sensations of ALS tract- ANSWER - pain
- temperature
- crude touch (pressure/ large surface area)
What is the spinocerebellar system responsible for? - ANSWER - unconscious
proprioception (limb position, joint angle, muscle tone and length)
- cannot be tested clinically
What is the pathway of the DCML tract? -ANSWER sensory info --> dorsal root ganglion
--> dorsal horn --> DCML tract --> medulla (fibers cross sides to ML) --> VPL nucleus of
thalamus --> anterior internal capsule --> S1 cortex
The __________ spinothalamic is responsible for pain and temperature. -ANSWER lateral
The ___________ spinothalamic is responsible for ______ and ____________ -ANSWER
crude touch and firm pressure
, What is the course of the ALS tract? -ANSWER sensory information --> dorsal root
ganglion --> dorsal horn --> ALS tract (fibers cross) --> medulla, pons, midbrain --> VPL
nucleus in thalamus --> anterior internal capsule --> S1 cortex
Where are the 1st, 2nd and 3rd order neurons in the DCML Tract? -ANSWER 1st =
sensory receptors to medulla
2nd = medulla to thalamus
3rd = thalamus to S1 cortex
Where would the 1st, 2nd and 3rd order neurons be in the ALS tract? - ANSWER 1st =
sensory receptor to the ALS tract
2nd = ALS tract to thalamus
3rd = thalamus to S1 cortex
A patient presents with a lesion at the left fasciculus gracilis at T8. What would the
impairment? - ANSWER - loss of light touch, vibration, proprioception, in LEFT leg and
lower trunk.
A lesion of the right lateral spinothalamic tract at T7 in a patient would present what
impairment? - ANSWER - loss of pain and temperature on the LEFT side below the
lesion.
Draw a topographic map of the ascending tracts of the spinal cord. - ANSWER .
Name the descending pathways. - ANSWER - corticobulbar
- corticospinal
- corticopontine
- rubrospinal
- reticulospinal
