1.3.4. Scapular Movements and Muscles Flashcards
Where does the initial movement occur for the Abduction of the Arm (from the anatomical position)?
The Shoulder (Glenohumeral) Joint
After the first 30 degrees abduction, what other joint becomes involved?
The Scapula-Thoracic Joint
What is the Scapulo-Humeral Rhythm?
The 2:1 ration of:
2 degrees occurring at the Shoulder (Glenohumeral) Joint
1 degree occurring at the Scapulo-Thoracic joint
What is the Scapulo-Thoracic Joint?
The movement of the Scapula on the Thoracic Wall
Is the Scapulo-Thoracic Joint a True Joint?
No - movement occurs around a joint axis, but no joint surfaces or structures are present
What muscles cause elevation of the Scapula?
- Superior Fibres of the Trapezius Muscle
- Levator Scapulae
- Rhomboids
What muscles cause depression of the Scapula?
- Inferior Firbres of the Trapezius
- Pectoralis Minor
- Subclavious
- Serratus Anterior
- Latissimus Dorsi
What muscles cause protraction (forward movement) of the Scapula?
- Serratus Anterior
- Pectoralis Major may assist
- Pectoralis Minor may assist
What muscles cause retraction (backward movement) of the Scapula?
- Middle fibres of the Trapezius
2. Rhomboids
What muscles cause lateral (upward) rotation of the Scapula? (Elevating the Glenoid Cavity)
- Superior Fibres of the Trapezius
2. Serratus Anterior
What muscles cause medial (downward) rotationof the Scapula? (Depressing the Glenoid Cavity)
- Levator scapulae
- Rhomboid
- Pectoralis Major
(Gravity will assist)