Muscles of the Shoulder Girdle Flashcards
Where is the Origin of the Pectoralis Minor?
Ribs 3-5
Where is the Insertion of the Pectoralis Minor?
Coracoid process of the scapula
What joint does the Pectoralis Minor cross?
The Shoulder Girdle
What are the the actions of the Pectoralis Minor when the Origin is fixed?
protraction, downward rotation of the scapula
What is the action of the Pectoralis Minor when the Insertion is fixed?
Elevates ribs during breathing
What are the Origins of the Trapezius?
Back of the skull, C7 & T1-12
Where are the Insertions of the Trapezius?
Spine of the scapula and the lateral edge of the clavicle
What joint does the Trapezius cross?
Shoulder Girdle
What Actions do the upper fibres of the Trapezius cause?
Elevate the shoulder girdle and help with neck extension
What Action does the middle fibres of the Trapezius cause?
Retract the shoulder girdle
What Action does the lower fibres of the Trapezius cause?
Depress the shoulder girdle
What Action does the whole muscle contracting cause?
Upward rotation of the scapula
Where are the Origins of the Rhomboids?
Spinous processes of C7 and T1-5
Where is the Insertion of the Rhomboids?
Medial border of the scapula
What joint do the Rhomboids cross?
Shoulder Girdle
What are the Actions of the Rhomboids?
Retracts scapula
Downwardly rotates the scapula
Where is the Origin of the Levator Scapulae?
Transverse processes of the cervical vertebrae (C1-C4)
Where is the Insertion of the Levator Scapulae?
Medial border of the scapula, between the superior angle and the root of the spine of the scapula
What joint does the Levator Scapulae cross?
Shoulder Girdle
What are the Actions of the Levator Scapulae when the Origin is fixed?
Elevates the scapula and assists in downward rotation of the scapula
What is the Action of the Levator Scapulae when the Insertion is fixed?
Laterally flexes the neck
Where is the Origin of the Serratus Anterior?
Front of ribs 1-8
Where its the Insertion of the Serratus Anterior?
Anterior surface of the medial border of the scapula
What joint does the Serratus Anterior cross?
Shoulder girdle
What are the Actions of the Serratus Anterior?
Protracts the scapula
Upwardly rotates the scapula (with trapezius)
What condition can a weakness of the Serratus Anterior cause?
Winged Scapula
