Ascending And Descending Tracts Of Spinal Cord Ppt ^hot^
Slide 1: Introduction
Anterior Corticospinal: Controls proximal/axial muscles; remains uncrossed until the spinal level. ascending and descending tracts of spinal cord ppt
Ascending tracts are responsible for transmitting sensory information from the body to the brain. They carry signals related to touch, pressure, temperature, pain, and proprioception (position and movement sense). The main ascending tracts of the spinal cord are: Gray Matter: Location of cell bodies (interneurons and
- Gray Matter: Location of cell bodies (interneurons and motor neurons). Divided into dorsal horn (sensory), ventral horn (motor), and lateral horn (autonomic).
- White Matter: Composed of myelinated and unmyelinated nerve fibers. Divided into three columns (funiculi):
- Key term: Immediate decussation in spinal cord.
(first-order in the dorsal root ganglion, second-order in the spinal cord or brainstem, and third-order in the thalamus). Tract Group Specific Tracts Decussation (Crossover) Dorsal Columns (DCML) Fasciculus Gracilis (lower limb) & Cuneatus (upper limb) Fine touch, vibration, conscious proprioception Medulla oblongata Anterolateral System Lateral & Anterior Spinothalamic Key term: Immediate decussation in spinal cord
Introduction: The Highway SystemStart by visualizing the spinal cord not just as a tube of nerves, but as the body's primary interstate highway. The white matter acts as the pavement where high-speed traffic (axons) flows between two major hubs: the Brain (Headquarters) and the Body (The Field).
Fine touch, vibration, and conscious proprioception (position sense). Key Tracts: Fasciculus gracilis (lower body) and Fasciculus cuneatus (upper body). Decussation (Crossing over): Occurs in the medulla oblongata. B. Spinothalamic Tracts Lateral Spinothalamic: Carries sensations of pain and temperature Anterior Spinothalamic: crude touch and pressure Decussation:
