Tight muscles
Coracobrachialis+
Coracobrachialis
Muscle dictionary
- Functions
- Flexes and adducts the arm at the shoulder and helps stabilize the humeral head
- Origin
- Coracoid process of the scapula
- Insertion
- Middle third of the medial humerus
Latissimus dorsi+
Latissimus dorsi
Muscle dictionary
- Functions
- Extends; adducts; and medially rotates the arm
- Origin
- Lower thoracic vertebrae, thoracolumbar fascia, iliac crest, and lower ribs
- Insertion
- Floor of the intertubercular sulcus of the humerus
Pectoralis minor+
Pectoralis minor
Muscle dictionary- Functions
- Draws the scapula anteriorly and inferiorly against the thoracic wall; contributing to scapular downward rotation; and may assist forced inspiration when the scapula is fixed
- Origin
- Ribs three to five
- Insertion
- Coracoid process of the scapula
Weakened muscles
Lower trapezius+
Lower trapezius
Muscle dictionary
- Functions
- The lower fibers assist scapular depression and upward rotation and contribute to posterior tilt during arm elevation
- Origin
- Lower thoracic spinous processes
- Insertion
- Medial end of the scapular spine
Serratus anterior+
Serratus anterior
Muscle dictionary
- Functions
- Protracts the scapula; assists upward rotation; and helps hold the scapula against the rib cage
- Origin
- Upper eight or nine ribs
- Insertion
- Anterior medial border of the scapula
