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🧠đŸĻ´ Anatomy of the Spinal Cord – The Main Communication Highway of the BodyThe spinal cord is a long, cylindrical part of...
13/02/2026

🧠đŸĻ´ Anatomy of the Spinal Cord – The Main Communication Highway of the Body
The spinal cord is a long, cylindrical part of the central nervous system that extends from the foramen magnum of the skull to approximately the L1–L2 vertebral level in adults. It transmits nerve impulses between the brain and the body and controls reflex activity.
📍 Location & Protection
The spinal cord lies within the vertebral canal and is protected by:
â€ĸ Vertebrae
â€ĸ Meninges (dura mater, arachnoid mater, pia mater)
â€ĸ Cerebrospinal fluid
📏 Length & Enlargements
The cord shows two important enlargements:
â€ĸ Cervical enlargement – supplies upper limbs
â€ĸ Lumbosacral enlargement – supplies lower limbs
đŸ§Ŧ External Features
â€ĸ Anterior median fissure (deep groove in front)
â€ĸ Posterior median sulcus (shallow groove behind)
â€ĸ Spinal nerve roots emerge laterally
â€ĸ Ends as conus medullaris
â€ĸ Continues as filum terminale
â€ĸ Nerve roots form cauda equina
🔍 Internal Structure (Cross-section)
Gray Matter (central H-shaped)
â€ĸ Anterior horns – motor neurons
â€ĸ Posterior horns – sensory neurons
â€ĸ Lateral horns – autonomic neurons (T1–L2)
White Matter (surrounding)
Contains ascending and descending tracts:
â€ĸ Sensory tracts → brain
â€ĸ Motor tracts → body
🧠 Spinal Nerves
Each spinal segment gives rise to:
â€ĸ Posterior (sensory) root with dorsal root ganglion
â€ĸ Anterior (motor) root
→ Join to form a mixed spinal nerve
Total: 31 pairs
🩸 Blood Supply
â€ĸ Anterior spinal artery (supplies front 2/3)
â€ĸ Two posterior spinal arteries
â€ĸ Reinforced by segmental arteries
âš•ī¸ Clinical Importance
â€ĸ Cord compression → paralysis or sensory loss
â€ĸ Herniated disc may press nerve roots
â€ĸ Spinal anesthesia done in lumbar region
â€ĸ Injury level determines deficit pattern
📚 The spinal cord acts as the body’s information superhighway — linking the brain to every organ and muscle.

09/02/2026

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🧠 The Nucleus of the Posterior Commissure (Pretectal Region)An essential pretectal nucleus involved in the pupillary lig...
06/02/2026

🧠 The Nucleus of the Posterior Commissure (Pretectal Region)

An essential pretectal nucleus involved in the pupillary light reflex and coordination of ocular movements. It serves as a critical relay between retinal input and the Edinger–Westphal nucleus, playing a key role in bilateral pupillary constriction.

🧠 The Nucleus Tegmentalis Dorsalis (DTN): Locomotor IntegrationLocated within the pontine tegmentum, the dorsal tegmenta...
03/02/2026

🧠 The Nucleus Tegmentalis Dorsalis (DTN): Locomotor Integration

Located within the pontine tegmentum, the dorsal tegmental nucleus plays a key role in gait control and locomotor coordination. By interacting with the mesencephalic locomotor region (MLR) and medullary reticular formation (MRF), the DTN contributes to initiation, modulation, and rhythmic pattern generation of movement.

Understanding this brainstem network is essential for appreciating how central motor pathways translate neural signals into coordinated locomotion.

03/02/2026
Decorticate vs Decerebrate👉Quick mnemonics â€ĸ Decorticate = “to the CORE” → arms bend toward the core (flex) â€ĸ Decerebrat...
03/02/2026

Decorticate vs Decerebrate

👉Quick mnemonics
â€ĸ Decorticate = “to the CORE” → arms bend toward the core (flex)
â€ĸ Decerebrate = “BRATE = straight” → arms straight (extend)

👉Clinical pearl
â€ĸ Decorticate → decerebrate can suggest worsening/descending herniation (emergency).

👉Decorticate (flexor posturing)
â€ĸ Arms: flexed, adducted (“bent to the chest”), wrists/fingers flexed
â€ĸ Legs: extended, plantar flexed
â€ĸ Lesion level: above the red nucleus → cortex / internal capsule (cerebral hemispheres)
â€ĸ Meaning: severe brain injury, but usually better prognosis than decerebrate
â€ĸ Common causes: large hemispheric stroke, TBI, cerebral edema, early herniation

👉Decerebrate (extensor posturing)
â€ĸ Arms: extended and adducted, pronated, wrists flexed
â€ĸ Legs: extended, plantar flexed
â€ĸ Lesion level: at or below the red nucleus → midbrain/pons/brainstem
â€ĸ Meaning: worse prognosis (brainstem involvement)
â€ĸ Common causes: brainstem stroke, severe TBI, uncal/tonsillar herniation, hypoxic-ischemic injury

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