645
PHAscending and descending tracts.
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Here’s a quick review.
Ascending (Sensory) Tracts
These carry sensory information from the body to the brain.
1. Dorsal Column–Medial Lemniscal Pathway (DCML)
Fasciculus gracilis�
Fasciculus cuneatus �Carries: fine touch, vibration, proprioception�
2. Spinothalamic Tracts
Anterior spinothalamic tract�
Lateral spinothalamic tract �Carries: crude touch (anterior), pain and temperature (lateral)�
3. Spinocerebellar Tracts
Dorsal spinocerebellar tract�
Ventral spinocerebellar tract�
Cuneocerebellar tract�
Rostral spinocerebellar tract �Carries: unconscious proprioception to the cerebellum�
4. Spinoreticular Tract Carries: slow pain, arousal pathways
5. Spinotectal Tract Carries: reflexive orienting to visual and auditory stimuli
Descending (Motor) Tracts
These carry motor commands from the brain to the body.
Pyramidal (Direct) Pathways
1. Corticospinal Tracts
Lateral corticospinal tract�
Anterior corticospinal tract �Controls: voluntary, fine motor movement�
2. Corticobulbar Tract Controls: cranial nerve motor output
Extrapyramidal (Indirect) Pathways
1. Rubrospinal Tract Function: limb flexor facilitation
2. Vestibulospinal Tracts
Lateral vestibulospinal�
Medial vestibulospinal �Function: posture, balance, head/neck stability�
3. Reticulospinal Tracts
Pontine reticulospinal�
Medullary reticulospinal �Function: muscle tone, autonomic control, posture�
4. Tectospinal Tract Function: reflex head movements in response to visual/auditory stimuli
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