Muscles of the Shoulder Girdle Joints Flashcards
What are the muscles of the shoulder girdle joints?
- Trapezius
- Rhomboids
- Levator Scapulae
- Serratus Anterior
- Pectoralis Minor
- Subclavius
What is the origin, insertion and actions of Trapezius?
O : External occipital protuberance, superior nuchal line of the occiput, the nuchal ligament and spinous processes of C7-T12
I : Clavicle, acromion process and the spine of the scapula
A :
1. Elevates the scapula and clavicle at the scapulocostal joint
2. Retracts the scapula at the scapulocostal joint
3. Upwardly rotates the scapula at the scapulocostal joint
4. Depresses the scapula at the scapulocostal joint
What is the origin, insertion and actions of Rhomboids?
O : Spinous Processes of C7-T5
I : Medial border of scapula, from the root of the spine to the inferior angle of scapula
A :
1. Retracts the scapula at the scapulocostal joint
2. Elevates the scapula at the scapulocostal joint
3. Downwardly rotates the scapula at the scapulocostal joint
What is the origin, insertion and actions of Levator Scapulae?
O : Transverse Processes of C1-C4
I : Medial border of the scapula, from the superior angle to the root of the spine of the scapula
A : Elevates the scapula at the scapulocostal joint
What is the origin, insertion and actions of Serratus Anterior?
O : Ribs 1-9 anterolaterally
I : Anterior surface of the entire medial border of the scapula
A :
1. Protracts the scapula at the scapulocostal joint
2. Upwardly rotates the scapula at the scapulocostal joint
What is the origin, insertion and actions of Pectoralis Minor?
O : Ribs 3-5
I : Coracoid process of the scapula
A :
1. Protracts the scapula at the scapulocostal joint
2. Depresses the scapula at the scapulocostal joint
3. Downwardly rotates the scapula at the scapulocostal joint
What is the origin, insertion and actions of subclavius?
O : 1st rib
I : Clavicle
A : Depresses the clavicle at the scapulocostal joint
