Shoulder
What are the three muscle attachments for muscle on the shoulder?
1. Supraspinous fossa
2. Subscapular fossa
3. Infraspinous fossa
What does the pectoralis major do?
Adducts humerus
Medially rotates humerus
Clavicle head: flexes humerus
Sternocostal head: extends humerus
Protracts and depresses scapula
What does the levator scapulae do?
Elevates scapula
Downward rotates scapula
What does the supraspinatus do?
Initiates and assists deltoid in abduction of humerus
What are the angle and processes of the scapula?
1. Acromion
2. Superior angle
3. Coracoid angle
4. Inferior angle
5. Glenoid fossa
6. Subscapular notch
What does the pectoralis minor do?
Depresses scapula (inferior)
Protracts scapula (anteriorly)
Downward rotates scapula
What does the latissimus dorsi do?
Extends humerus
Adducts humerus
Medially rotates humerus
Downward rotates scapula
Depresses scapula
Retracts scapula
What does the infraspinatus do?
Laterally rotates humerus
What are the joints of the shoulder?
Sternoclavicular joint
Acromioclavicular joint
Glenohumeral joint
Scapulothoracic joint
What does the subclavius do?
Depresses clavicle
What is the rhomboids major and minor do?
Elevates scapula
Retracts scapula
Downward rotates scapula
What does the teres minor do?
Laterally rotates the humerus
What are the extrinsic anterior and posterior muscles of the shoulder?
(Anterior)
Pectoralis major
Pectoralis minor
Subclavius
Serratus anterior
(Posterior)
Trapezius
Latissimus dorsi
Levator scapulae
Rhomboids major and minor
What does the serratus anterior do?
(Boxers muscle)
Protracts scapula
Upward rotates scapula
Depresses scapula
What does the teres major do?
Adducts humerus
Medially rotates humerus
What does the subscapularis do?
Medially rotates the humerus
What are the intrinsic shoulder muscles?
Deltoid
Supraspinatus
Infraspinatus
Teres minor
Teres major
Subscapularis
What does the trapezius do?
Descending:
- elevates scapula
Middle:
- retracts scapula
Ascending:
- depresses scapula
Descending + Ascending:
- upward rotation
What does the deltoid do?
Anterior:
Flexes and medially rotates humerus
Middle:
Abducts humerus
Posterior:
Extends and laterally rotates humerus