Ascending And — Descending Tracts Of Spinal Cord Ppt Fixed

Ascending tracts, described in detail on Kenhub , carry sensory data—such as touch, pain, temperature, and proprioception—from the body to the brain. They typically involve a three-neuron chain: From receptor to spinal cord.

Carry instructions down from the brain to the muscles and glands. 2. Ascending Tracts (Sensory Pathways)

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Ascending and Descending Tracts of the Spinal Cord Subtitle: Functional Anatomy and Clinical Significance Presenter Name: [Your Name] Date: [Date] ascending and descending tracts of spinal cord ppt

To understand how tracts function, it is necessary to first look at the cross-sectional geography of the spinal cord. In a transverse section, the spinal cord exhibits a clear division between gray matter and white matter.

Fasciculus gracilis (lower limbs) and fasciculus cuneatus (upper limbs).

Anterior Spinothalamic Tract: Transmits crude touch and pressure. Ascending tracts, described in detail on Kenhub ,

Posterior Spinocerebellar Tract : Uncrossed fibers entering via the inferior cerebellar peduncle.

| | Type | Function | Decussation | Lesion Deficit (Unilateral) | |---|---|---|---|---| | Dorsal column | Ascending | Fine touch, vibration, proprioception | Medulla (ipsilateral → contralateral) | Ipsilateral loss of tactile discrimination, vibration, proprioception | | Lateral spinothalamic | Ascending | Pain, temperature | Spinal cord (contralateral) | Contralateral loss pain/temp 1-2 segments below lesion | | Ventral spinothalamic | Ascending | Crude touch | Spinal cord (contralateral) | Contralateral crude touch loss | | Dorsal spinocerebellar | Ascending | Unconscious proprioception (lower limb) | Ipsilateral | Subtle ataxia | | Ventral spinocerebellar | Ascending | Unconscious proprioception (lower limb) | Double crossing | Subtle ataxia | | Lateral corticospinal | Descending | Skilled voluntary movements (distal) | Medulla (contralateral) | Ipsilateral UMN signs below lesion | | Anterior corticospinal | Descending | Axial (trunk) muscles | Spinal segmental | Mild trunk weakness (bilateral) | | Rubrospinal | Descending | Flexor facilitation (limited) | Midbrain (contralateral) | Unclear in humans | | Vestibulospinal | Descending | Extensor tone, posture | Ipsilateral | Postural/balance disturbance | | Reticulospinal | Descending | Modulation of reflexes, posture | Bilateral/spinal | Complex — spasticity release | | Tectospinal | Descending | Visual/auditory reflexes | Midbrain (contralateral) | Impaired orienting reflexes | | Olivospinal | Descending | Coordination (uncertain) | ? | Uncertain |

Anterior Corticospinal Tract: Controls proximal muscle movements. described in detail on Kenhub

85% of fibers decussate (cross) in the medulla. Controls distal limbs.

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