Spinal Anatomy Tracts (CNS) Flashcards
Motor fibers are what type of fibers
Efferent
Sensory comes from what type of fibers
Afferent
The corticospinal tract (pyramidal) (lateral and Anterior) functions to do what
Precise and skilled voluntary movement
What is the origin and destination of the corticospinal tracts
Primary and Secondary motor cortex, parietal lobe
Internuncial neurons or alpha motor neurons
How far does the 1) Lateral corticospinal and 2) Anterior corticospinal tract go down the cord
1) Length of the cord
2) Stops mid-thoracic
the reticulospinal (pontine and medullary) functions to do what
Inhibit or facilitate voluntary movement
what is the origin and destination of the Reticulospinal tract
Reticular formation
Alpha and Gamma Motor Neurons
Where does the Renticulospinal tract decussate
at various locations
what is the function of the tectospinal tract
reflex postural movement to visual stimuli
what is the origin and destination of the tectospinal tract
Superior colliculus (midbrain)
Alpha and gamma motor neuron
The Rubrospinal tract functions to do what
Facilitates flexors and inhibits extensors
what is the origin and destination of the the Rubrospinal tract
Red nucleus (midbrain)
Alpha and Gamma motor neurons
the vestibulospinal tract tract functions as what
Facilitates extensors and inhibits flexors
what is the origin and destination of the vestibulospinal tract
Lateral vestibular nucleus
Alpha and Gamma motor neurons
the vestibulospinal tract receives information from where
Inner ear (via vestibular nerve) and cerebellar information
The Corticospinal, Reticulospinal, tectospinal, rubrospinal and vestibulospinal tracts are what type of tracts
Descending (Motor) tracts
The Lateral and Anterior Spinothalamic, Dorsal columns (Fasciculus cuneatus and Fasciculus gracilis), Posterior and Anterior spinocerebellar, spinotectal and spinoreticular are all examples of what kind of tracts
Ascending (sensory) tracts
What is the function of the Lat. Spinothalamic thract
Pain and temperature
what is the Pathway of the Lateral spinothalamic tract
First posterior root gangion
Second Substantia Gelatinosa
Third Posterior lateral nucleus of the thalamus
the Posterior lateral nucleus of the thalamus relays info where
PostCentral gyrus
what is a fluid filled cyst that leads to cape-like (bilateral) los of pain and temperature
Syringomyelia
What is the function of the Anterior Spinothalamic tract
“Protopathic” is defensive to pain, temperature
Crude light touch
what is the pathway of the Anterior spinothalamic tract
1- Posterior root ganglion
2- Substantia Gelatinosa
3- Posterior lateral nucleus of the thalamus going to the Postcentral gyrus
Tactile sensation is found in what Tract
Anterior spinothalamic
what are the two tracts of the dorsal column
Fasciculus Cuneatus and Fasciculus Gracilis
What is the function of the posterior columns
Discriminative touch (2point), Vibration and conscious proprioception
what is the pathway of the dorsal columns
1- posterior root ganglion
2- Nuclei gracilis/cuneatus
3- posterior lateral nucleus of thalamus to the Postcentral gyrus
Cuneatus is above what spinal level
T6
Gracilis is below what spinal level
T6
what are some diseases that affect the dorsal columns
Diabetes mellitus Posteriolateral sclerosis (PLS) tabes dorsales (syphilis)
Posterior spinocerebellar tract function as what
Unconscious proproception
what is the pathway of the Posterior spinocerebellar tract
1- posterior root ganglion
2- Nucleus dorsalis (clark’s column) ascend through inferior cerebellar peduncle to cerebellum
The Posterior Spinothalamic tract travels through what
PI-Posterior inferior peduncle
the Anterior Spinothalamic tract function with what
unconscious proprioception
what is the pathway of the anterior spinothalamic tract
1- Posterior rood ganglion
2- Nucleus dorsalis (clark’s Column) cross segmentally and ascend through superior cerebellar peduncles to the cerebellum
which peduncle does the anterior spinocerebellar tract pass through
AS- Anterior Superior peduncle
the spinotectal tract functions with what
Spino visual reflexes
What is the pathway of the Spinotectal tract
1- Posterior rood ganglion
2- crosses segmentally and ascend to superior colliculus (Midbrain)
Spinotectal tract causes what to move with reflexes
movements of eyes and head toward stimulus
what is the other name for the spinotectal tract
Spino-Quadrigeminal system of Mott
The spinoreticular tracts function as what
Levels of consciousness
what is the pathway of the spinoreticular tract
1- posterior rood ganglion
2- ascend to nuclei of reticular formation (brainstem)
What will happen if the spinoreticular tract is damaged
a coma will be present
