Shoulder Girdle Flashcards
What [4] muscles act to depress the scapulothoracic joint ?
- Lower trapezius
- Lattissimus Dorsi
- Pectoralis minor
- Subclavius
What muscles act to protract the scapulothoracic joint [1]?
- Serratus Anterior
What [3] muscles act to retract the scapulothoracic joint?
- Middle trapezius
- Rhomboids
- Lower trapezius
What [2] muscles act to upwardly rotate the scapulothoracic joint?
- Serratus Anterior
- Upper and Lower trapezius
What [2] muscles act to downwardly rotate the scapulothoracic joint?
- Rhomboids
- Pectoralis Minor
What [3] muscles act to elevate the scapulothoracic joint?
- Upper trapezius
- Levator scapulae
- Rhomboids
Rotator cuff muscle: Supraspinatus
- O: Supraspinous fossa of the scapula
- I: Greater Tubercle of the humerus
- A:
- Abduction at GH joint
- Stabilization of the head of the humerus
- N: Suprascapular Nerve
- C5,C6 (upper trunk)
Rotator cuff muscle: Subscapularis
- O: Subscapular fossa of the scapula
- I: Lesser Tubercle of the humerus
- A: Internal Rotation at GH joint
- N: Upper and Lower fibers of the subscapular nerve
- C5,C6 (posterior cord)
Rotator cuff muscle: Teres Minor
- O: upper 2/3 of the lateral border of the scapula
- I: Greater Tubercle of the humerus
- A:
- External Rotation at GH joint
- Adduction of GH joint
- Stabilization of the head of humerus
- N: Axillary Nerve
- C5,C6 (posterior cord)
Rotator cuff muscle: Infraspinatus
- O: Infraspinous fossa of the scapula
- I: Greater Tubercle of the humerus
- A:
- External Rotation at GH joint
- Adduction of GH joint
- Stabilization of the head of humerus
- N: Suprascapular Nerve
- C5,C6 (upper trunk)
Teres Major
- O: Posterior surface of the inferior angle of the scapula
- I: Medial lip of the intertubercular sulcus
- A:
- Extension at GH joint
- Adduction of GH joint
- Medial Rotation of GH joint
- N: Lower Subscapular
- C5,C6 (posterior cord)
Primary muscles that medially rotate the shoulder [5 according to Neumann]:
- Subscapularis
- Teres Major
- Lattissimus Dorsi
- Pectoralis Major
- Anterior Deltoid
Lattissimus Dorsi
- O:
- Inferior angle of the scapula
- spinous processes of the last 6 thoracic vertebrae
- last 3 or 4 ribs
- thoracolumbar aponeurosis and posterior iliac crest
- I: Intertubercular groove of the humerus
- A:
- Extension at GH joint
- Adduction of GH joint
- Medial Rotation of the GH joint
- N: Thoracodorsal nerve
- C5,C6,C7 (posterior cord)
Convex/Concave of the scapulothoracic joint:
- Convex surface: Thorax
- Concave surface: Scapula
Convex/Concave of the acromioclavicular joint
- Convex surface: Clavicle (Variable)
- Concave surface: Acromion (Variable)