Spinocerebellar Tracts Flashcards
True or False:
The cerebellum has half of all the neurons in the cortex
True
Are the subconscious pathways typically ipsilateral or contralateral
Ipsilateral
How many neurons does the typical subconscious pathway have
2 a primary afferent and a projection neuron
True or False
In the case of the spinocerebellar pathways, receptors are mainly encapsulated proprioceptors associated with large myelinated axons
True
What do the spinocerebellar tracts convey information about
Limb and joint proprioception
What are the spinocerebellar tracts used for (2)
- Control of muscle tone
2. Influencing coordinated motor function
What does the ventral spinocerebellar tract carry info about
The lower limbs
How many times does the ventral spinocerebellar tract decussate
Twice (the only one that does so)
What does the dorsal spinocerebellar tract carry info about
The lower limbs
Which pathway carries information about past lower limb movements
Dorsal spinocerebellar tract
Which pathway carries information about future lower limb movements
Ventral spinocerebellar tract
What does the rostral spinocerebellar tract carry info about
The upper limbs
What does the cuneocerebellar tract carry info about
The upper limbs
Which pathway carries information about future upper limb movements
Rostral spinocerebellar tract
Which pathway carries information about past upper limb movements
Cuneocerebellar tract
True or False:
The dorsal and ventral spinocerebellar tracts run in parallel
True
True or False:
The dorsal and ventral spinocerebellar tracts convey information about whole limb movements and postural adjustments to the cerebellum
True
How many neurons do the dorsal and ventral spinocerebellar tracts have
2
Does the dorsal spinocerebellar tract decussate twice like the ventral
Nope it never decussates
What does damage to the dorsal and ventral spinocerebellar tracts result in
Loss of unconscious proprioception and subsequent coordination in the ipsilateral lower limb
True or False:
The first order DRG of the ventral spinocerebellar tract is of the lumbo-sacral region
True
What does the first order neuron innervate in the ventral spinocerebellar tract
Golgi tendon organs
Where does the second order neuron of the ventral spinocerebellar tract first cross
In the anterior commissure of the spinal cord
Where does the second order neuron of the ventral spinocerebellar tract cross for the second time
Superior cerebellar peduncles once in the cerebellum
Where does the second order neuron of the ventral spinocerebellar tract terminate
In the vermal region of the anterior lobe of the cerebellum
What does the dorsal spinocerebellar tract receive info from (2)
- GTO
2. Muscle spindle
Where does the first order neuron of the dorsal spinocerebellar tract send projections to
Nucleus dorsalis of Clarke (dorsal nucleus)
Where does the nucleus dorsalis of Clarke run
C8-L2
True or False:
The first order DRG of the dorsal spinocerebellar tract is a large diameter type I fiber
True
What does the first order neuron of the dorsal spincerebellar tract innervate
Muscle spindles mainly and some GTOs
Where does the second order neuron of the dorsal spinocerebellar tract run
Ipsilaterally in the dorsal nucleus of Clarke to the inferior cerebellar peduncles
Where does the second order neuron terminate for the dorsal spinocerebellar tract
Cerebellar vermis of the anterior lobe
What does the rostral spinocerebellar tract transmit info from
GTOs of the ipsilateral cranial half (arm) of the body
Are the second order neurons of the rostral spinocerebellar tract in the nucleus dorsalis of Clarke
No they are rostral to it
Where does the second order neuron of the rostral spinocerebellar tract send axons
Through the lateral funiculus to the cerebellum via the inferior cerebellar peduncle
What does the first order neuron of the cuneocerebellar tract innervate (2)
- GTOs
2. Muscle spindles
Where do the fibers of the cuneocerebellar tract travel in the spinal cord
Fasciculus cuneatus
Where does the first order neuron of the cuneocerebellar tract terminate on it’s second order neuron
Accessory cuneate nucleus of the medulla
What is the accessory cuneate nucleus of the medulla located
Laterally to the cuneate nucleus
What is the accessory cuneate nucleus the upper extremity equivalent of
Nucleus dorsalis of Clarke
Where do the axons of the accessory cuneate nucleus travel
Backwards to the inferior cerebral peduncles and project to the ipsilateral vermis in the anterior lobe