Retrieval Quiz 18

What motions can the scapulothoracic joint perform?

Protraction, retraction, elevation, depression, upward rotation, and downward rotation

What are the two muscles in the scapulothoracic joint that aren’t posterior?

Serratus anterior (lateral) and pectoralis minor (anterior)

What scapulothoracic joint muscles perform protraction?

Serratus anterior and pectoralis minor

What scapulothoracic joint muscles perform retraction?

Upper trapezius, middle trapezius, lower trapezius, and rhomboids

What scapulothoracic joint muscles perform elevation?

Upper trapezius, levator scapula, and rhomboids

What scapulothoracic joint muscles perform depression?

Lower trapezius and pectoralis minor

What scapulothoracic joint muscles perform upward rotation?

Upper trapezius, middle trapezius, lower trapezius, and serratus anterior

What scapulothoracic joint muscles perform downward rotation?

Levator scapula, rhomboids, and pectoralis minor

Upper Trapezius

Origin: occipital protuberance and spinous processes of C1-C6. Insertion: lateral third of clavicle and acromion process.

Middle Trapezius

Origin: spinous processes of C7-T3. Insertion: acromion process and spine of scapula.

Lower Trapezius

Origin: spinous processes of T4-T12. Insertion: spine of scapula.

Levator Scapula

Origin: transverse processes of C1-C5. Insertion: superior angle and superior vertebral border.

Rhomboids

Origin: spinous processes of C7-T5. Insertion: vertebral border of scapula and inferior angle.

Serratus Anterior

Origin: lateral surface of 1-8 ribs. Insertion: anterior surface of vertebral border.

Pectoralis Minor

Origin: anterior surface of 3-5 ribs. Insertion: coracoid process.