EXAM 1 Tract Names Flashcards
DCML
conscious. discriminative touch, proprioception and vibration
enters the DRG and goes to the medulla, synapses (within the given nuclei), decussates and goes to the VPL of the thalamus, and then from thalamus to the cortex, with the homunculus
remember: fascicles gracilis and cuneatus
anterolateral/spinothalamic
the conscious, light touch, crude course touch, pleasurable touch (insula) and discriminative pain and temperature.
enters the dorsal horn, and synapses in the DRG. DECUSSATES. Then travels to the thalamus (VPL) and then to the cortex.
what fibers carry heating and cooling
cooling is a delta and heat is c.
what are the three divergent pathways
these carry slow pain, and they are the spinomesencephalic (turns head to the stimulus, travels to the superior colliculus and the periaqueductal grey).
spinoreticular: does the arousal, attention and sleep wake cycles and even attentiveness and alertness.
spinoemotional: to the medial and inter laminar nuclei of the thalamus, then to cortex. Reaches consciousness, so there is emotions being affect, sensation and personality. POOR localized pain because reaches consciousness.
what is the spinocerebellar tract
unconscious pain, makes adjustments and anticipatory response. high fidelity and internal feedback
high fidelity: posterior spinocerebellar (proprioception from lower 1/2 of the body, to the inferior cerebellar peduncle), cuneocerebellar (proprioception from the upper body, through the inferior cerebellar peduncle SYNAPSES IN THE LOWER MEDULLA).
Internal feedback:
anterior spinocerebellar: from the throacodorsal grey matter of the spinal cord, decussates immediately and then goes to contract midbrain and cerebellum through the superior cerebellar peduncle.
rostrospinocerebellar: from the C-spine to the T1. ipsilateral cerebellum via the superior and inferior peduncles.
what do the medial tracts do
control gross movements
what are the medial tracts
the reticulospinal: bilateral posture and limb movement. Coordinating the limbs, and neck reflexes. It is bilateral innervation.
medial vestibulospinal: head position and movement, LMN to the neck and upper back, bilateral innervation.
Lateral vestibulospinal: postural, keeping center or gravity. LMN of the trunk, turn on extensors, inhibits flexors.
Medial corticospinal. Goes through medulla pyramids, LMN to the neck, shoulder and trunk muscles.
what are the lateral tracts for
fractionated movement
what are the two lateral tracts.
the rubrospinal tract. from the red nucleus, decussates in the midbrain, and then will go to the spine. minor contribution to the upper limb and distal extensors.
the lateral corticospinal tract: the most important for voluntary movement. controls the movement of extremities.
are signs contralateral or ipsilateral if the lesion occurs above the pyramidal decussation or below
above, contralateral
below: ipsilateral
does the lower face get bilateral innervation?
no, so the lesion is ipsilateral
what are the non-specific motor tracts
cureolspinal: from the locus curelius, release NE to keep the tonic contraction.
raphespinal: from the raphe nuclei, releases serotonin, and enhances activity of LMN and interneurons.
