Definition & Operational Usage of Glasgow Motor Score
What Is Glasgow Motor Score?
Glasgow Motor Score is the 1 to 6 point motor component of the Glasgow Coma Scale (GCS), evaluating motor responsiveness: 6 = Obeys commands, 5 = Localizes pain, 4 = Normal flexion (withdrawal), 3 = Abnormal flexion (decorticate), 2 = Extension (decerebrate), 1 = No movement.
⚠️ Operational Safety Warning:Decerebrate posturing (extension, score of 2) indicates severe midbrain/pons compression and impending brain herniation — immediately hyperventilate slightly only if herniation signs are active per protocol.
Why Glasgow Motor Score Matters on the Fireground
The motor score is the single strongest predictor of neurological outcome in traumatic brain injury. Distinguishing between decorticate (flexion) and decerebrate (extension) posturing indicates severe brainstem compression.
Relevant NFPA Standards
- NREMT Standards: National Registry of Emergency Medical Technicians Practice Standards
- NFPA 455: Standard for Emergency Medical Services (EMS)
Field Procedures & Tactical Steps
- Ask the patient to perform a two-step motor command ('Hold up two fingers and squeeze my hand') — if successful, score 6.
- If uncooperative, apply central painful stimulus (trapezius pinch or supraorbital pressure).
- If the hand reaches above the clavicle toward the stimulus, score 5 (Localizes Pain).
- If the arm flexes rapidly away without reaching the stimulus site, score 4 (Normal Flexion).
- If arms flex inward rigidly (decorticate), score 3; if arms extend downward and rotate inward (decerebrate), score 2; if completely flaccid, score 1.
Common Context & Application
Evaluated on all trauma patients, head injury calls, non-responsive medical calls, and critical care transport assessments.
Frequently Asked Questions about Glasgow Motor Score
What is the difference between decorticate and decerebrate posturing?
Decorticate posturing (score 3) involves rigid flexion of the arms inward toward the chest (cortex damage), while decerebrate posturing (score 2) involves rigid extension of arms at the sides with wrist rotation (brainstem damage).
Why is the motor score considered the most important part of GCS?
The motor response correlates most directly with functional neurological recovery and brainstem integrity in severe traumatic brain injury studies.
Relevant Tools
Operational calculators related to Glasgow Motor Score:
Category:EMS & Medical
— Patient care, assessment, interventions, triage, and EMS system terms commonly used by firefighter/medics.