Ascending And Descending Tracts Of Spinal Cord Ppt ~upd~ Info

These carry "express" messages like fine touch and proprioception (knowing where your limbs are).

The spinal cord is a vital part of the central nervous system (CNS), extending from the base of the brain down to the lower back. It plays a crucial role in transmitting messages between the brain and the rest of the body. The spinal cord contains various tracts that facilitate the transmission of signals, which can be broadly classified into two main categories: ascending and descending tracts. In this article, we will provide an in-depth overview of the ascending and descending tracts of the spinal cord, their functions, and significance.

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The spinal cord tracts are categorized into (sensory/afferent) and descending (motor/efferent) pathways that allow the brain to communicate with the rest of the body. 1. Ascending Tracts (Sensory Pathways)

Originates in the superior colliculus of the midbrain. Mediates reflex head and neck movements in response to visual and auditory stimuli. High-Yield Clinical Correlations These carry "express" messages like fine touch and

| Feature | DCML | Spinothalamic | | :--- | :--- | :--- | | | Fine touch, vibration, proprioception | Pain, temperature, crude touch | | Peripheral Fiber | Large, myelinated (A-alpha/beta) | Small, unmyelinated (A-delta & C) | | Decussation Level | Medulla | Spinal cord (anterior white commissure) | | Lesion Deficit | Ipsilateral loss below lesion | Contralateral loss 1-2 segments below lesion |

Flaccid paralysis, hyporeflexia, hypotonia, muscle atrophy, and fasciculations (muscle twitches). PPT Slide Outline Blueprint The spinal cord contains various tracts that facilitate

The ascending tracts of the spinal cord are responsible for transmitting sensory information from the body to the brain. The main ascending tracts include:

Descending tracts originate in the brain and control muscle activity. They are organized into (voluntary movement) and Extrapyramidal (involuntary, tone, and posture) systems. A. Pyramidal System (Corticospinal Tracts) Origin : Primary motor cortex (Precentral gyrus).

DORSAL FUNICULUS ┌──────────────────────┐ │ Gracile fasciculus │ ← fine touch/proprioception (lower limb) │ Cuneate fasciculus │ ← fine touch/proprioception (upper limb) └──────────────────────┘ ┌──────────────────────┐ LATERAL│ Lateral corticospinal│ ← voluntary movement COLUMN│ Rubrospinal │ ← flexor facilitation │ Lateral reticulospinal│ ← modulation │ Dorsal spinocerebellar│ ← unconscious proprio (ipsilateral) │ Ventral spinocerebellar│← unconscious proprio (crossing) │ Lateral spinothalamic │ ← pain/temp └──────────────────────┘ ┌──────────────────────┐ │ Anterior corticospinal│← axial muscles VENTRAL│ Vestibulospinal │ ← posture/extensor COLUMN│ Medial reticulospinal │← excitation │ Tectospinal │ ← visual reflexes │ Ventral spinothalamic │ ← crude touch/pressure │ Spinotectal/Spino-olivary │ └──────────────────────┘ VENTRAL FUNICULUS

Control involuntary actions like posture and balance. Vestibulospinal: Posture and balance. Rubrospinal: Voluntary movement of upper limbs. Reticulospinal: Regulation of muscle tone.