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15 Cards in this Set

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Where are the cell bodies located for the cortical spinal tract?
Cell bodies in motor cortex of brain.
Describe the path(s) followed by the cortical spinal tract(s).
2) 85% of fibers decussate in the caudal medulla and descend in lateral corticospinal tract.
15% remain ipsilateral until a given level in the spinal cord. Descend in the anterior corticospinal tract.
List the function of the cortical spinal tract(s).
lateral: Involved in manipulation and fine movements of the distal parts of limbs.
anterior: Involved in posture.
Where are the cell bodies located for the rubrospinal tract?

Does it decussate? If so, where?
Cells bodies in red nucleus situated in the tegmentum of midbrain.

Yes, immediately.
Where are the cell bodies of the reticulospinal tract?
Cell bodies are in the pontine and medullary reticular formation.
For the reticulospinal tract, describe the descent of the fibers originating in the pons area of the RF.
Fibers descend and remain mostly ipsilateral.
For the reticulospinal tract, describe the descent of the fibers originating in the medulla of the RF.
Fibers descend both ipsilaterally and contralaterally in the reticulospinal tracts.
What are the three functions of the reticulospinal fibers? The third function involves the hypothalamus.
1) Involved in influence of muscle spindles, making them more or less sensitive and hence altering muscle reflexes.
2) Involved in walking and postural moves.
3) Involved in the control of sympathetic and sacral parasympathetic outflow by hypothalamus.
Where are the cell bodies located of the tectospinal tract?
Cell bodies are in the deep layers of the superior colliculus in the midbrain.
Describe the descent of the fibers comprising the tectospinal tract.
Fibers decussate just caudally to their region of origin in the midbrain and descend close to the medial longitudinal fasciclus in the tectrospinal tract.
Where are the cell bodies located for the lateral vestibulospinal tract?

For the medial vestibulospinal tract?
Lateral Vesicular nuclei situated in the pons.

Medial vestibular nucleus.
Describe the descending path for the Lateral vestibulospinal tract.

For the medial vestibulospinal tract.
Axons descend ipsilaterally.

Axons project mainly to ipsilateral cervical regions of the spinal cord.
What is the function of the lateral vestibulospinal tract?

What do they do to ther targets?
Involved in postural control (especially related to movements of head).

Inhibiting axial flexor muscles, and stimulating axial extensor muscles.
What is the function of the medial vestibulospinal tract.

What do they do to their targets?
Involved in coordination of head and eye movements.

Mediates reflex head movements in response to vestibular stimuli.
What is another name fo the medial vestibulospinal tract?
Medial longitudinal fasciculus.