1.3.4. Scapular Movements and Muscles Flashcards

1
Q

Where does the initial movement occur for the Abduction of the Arm (from the anatomical position)?

A

The Shoulder (Glenohumeral) Joint

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2
Q

After the first 30 degrees abduction, what other joint becomes involved?

A

The Scapula-Thoracic Joint

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3
Q

What is the Scapulo-Humeral Rhythm?

A

The 2:1 ration of:
2 degrees occurring at the Shoulder (Glenohumeral) Joint
1 degree occurring at the Scapulo-Thoracic joint

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4
Q

What is the Scapulo-Thoracic Joint?

A

The movement of the Scapula on the Thoracic Wall

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5
Q

Is the Scapulo-Thoracic Joint a True Joint?

A

No - movement occurs around a joint axis, but no joint surfaces or structures are present

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6
Q

What muscles cause elevation of the Scapula?

A
  1. Superior Fibres of the Trapezius Muscle
  2. Levator Scapulae
  3. Rhomboids
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7
Q

What muscles cause depression of the Scapula?

A
  1. Inferior Firbres of the Trapezius
  2. Pectoralis Minor
  3. Subclavious
  4. Serratus Anterior
  5. Latissimus Dorsi
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8
Q

What muscles cause protraction (forward movement) of the Scapula?

A
  1. Serratus Anterior
  2. Pectoralis Major may assist
  3. Pectoralis Minor may assist
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9
Q

What muscles cause retraction (backward movement) of the Scapula?

A
  1. Middle fibres of the Trapezius

2. Rhomboids

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10
Q

What muscles cause lateral (upward) rotation of the Scapula? (Elevating the Glenoid Cavity)

A
  1. Superior Fibres of the Trapezius

2. Serratus Anterior

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11
Q

What muscles cause medial (downward) rotationof the Scapula? (Depressing the Glenoid Cavity)

A
  1. Levator scapulae
  2. Rhomboid
  3. Pectoralis Major
    (Gravity will assist)
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