Ascending And Descending Tracts Of Spinal Cord Ppt Link May 2026
Mastering Neuroanatomy: A Comprehensive Guide to Ascending and Descending Tracts of the Spinal Cord (PPT Resource)
Keywords: Ascending tracts, descending tracts, spinal cord anatomy, spinothalamic tract, corticospinal tract, dorsal column-medial lemniscus, neuroanatomy PPT, medical education.
Slide 4: Dorsal Column–Medial Lemniscus (DCML) Pathway
- Sensory modalities: Fine touch, vibration, proprioception (conscious).
- Pathway:
- 1st order: enters cord → ascends ipsilaterally in fasciculus gracilis (lower body) or cuneatus (upper body).
- 2nd order: synapse in medulla → decussate → medial lemniscus → thalamus.
- 3rd order: thalamus → sensory cortex.
- Key term: Decussation in medulla.
Slide 14: Summary Table of Major Tracts
| Tract | Type | Crosses | Function |
|-------|------|---------|----------|
| Lateral Spinothalamic | Ascending | Spinal cord | Pain, temp |
| Dorsal Column | Ascending | Medulla | Fine touch, vibration |
| Lateral Corticospinal | Descending | Medulla | Voluntary movement |
| Vestibulospinal | Descending | No | Balance, extensor tone | ascending and descending tracts of spinal cord ppt
Slide 8: Descending Tracts – Overview (Motor)
- Function: Control voluntary movement, posture, muscle tone, reflexes.
- Upper Motor Neuron (UMN): Brain → spinal cord.
- Lower Motor Neuron (LMN): Ventral horn → muscle.
- Two main groups: Corticospinal (pyramidal) & Extrapyramidal tracts.
