1.3.4. Scapular Movements and Muscles Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 1.3.4. Scapular Movements and Muscles > Flashcards

Flashcards in 1.3.4. Scapular Movements and Muscles Deck (11)
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1
Q

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

A

The Shoulder (Glenohumeral) Joint

2
Q

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

A

The Scapula-Thoracic Joint

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

4
Q

What is the Scapulo-Thoracic Joint?

A

The movement of the Scapula on the Thoracic Wall

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

6
Q

What muscles cause elevation of the Scapula?

A
  1. Superior Fibres of the Trapezius Muscle
  2. Levator Scapulae
  3. Rhomboids
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
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
9
Q

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

A
  1. Middle fibres of the Trapezius

2. Rhomboids

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

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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