Scapula Muscles + Rotator Cuff

What is the origin of the trapezius?

Occipital Bone, spines of C1-7 & T1-12

What is the insertion of the trapezius?

Acromion, spine of scapula, lateral 1/3 of clavicle

What are the actions of the trapezius?

EXTENDS THE NECK, elevates, depresses, & retracts scapula (superior rotation of scapula w/ serratus anterior)

What is the innervation of the trapezius?

CN - SPINAL ACCESSORY NERVE

What is the origin of the serratus anterior?

Ribs 1-9

What is the insertion of the serratus anterior?

SCAPULA MEDIAL BORDER

What is the innervation of the serratus anterior?

Long Thoracic Nerve

What are the actions of the serratus anterior?

PROTRACTS & stabilizes the scapula (superior rotation with Trapezius)

What is the origin of the Levator Scapulae?

Transverse Processes of C1-4

Where does the Levator Scapulae insert?

Superior angle & medial border of scapula

What nerve innervates the Levator Scapulae?

Dorsal Scapular Nerve

What are the actions of the levator scapulae?

Elevates Scapula (inferiorly rotates with Pectoralis minor & rhomboids)

What is the origin of the Rhomboid Minor?

Spinous Process of C7-T1

Where does the Rhomboid Minor insert?

MEDIAL BORDER OF SCAPULA

What nerve innervates the Rhomboid Minor?

Dorsal Scapular Nerve

What are the actions of the Rhomboid Minor?

Stabilizes, RETRACTS, and elevates the scapula, (inferiorly rotates with pectoralis minor and levator scapulae)

What is the origin of the Rhomboid Major?

Spinous Process of T2-T5

Where does the Rhomboid Major insert?

MEDIAL EDGE OF SCAPULA

What nerve innervates the Rhomboid Major?

Dorsal Scapular Nerve

What are the actions of the Rhomboid Major?

Stabilizes, RETRACTS, & elevates the scapula (inferiorly rotates with pectoralis minor and levator scapulae)

What is the origin of the Pectoralis Minor?

Ribs 3-5

What is the insertion of the Pectoralis Minor?

CORACOID PROCESS

What is the innervation of the Pectoralis Minor?

Medial and Lateral Pectoral N.

What are the actions of the Pectoralis Minor?

Stabilize, protract, & depress the scapula (inferiorly rotates w/ rhomboids and levator scapulae)

What muscles move the Scapula?

trapezius, rhomboid major, rhomboid minor, levator scapulae, pectoralis minor, serratus anterior

What are the rotator cuff muscles?

supraspinatus, infraspinatus, teres minor, subscapularis

What is the origin of the supraspinatus?

Supraspinous fossa

What is the insertion of the supraspinatus?

GREATER TUBERCLE

What is the innervation of the supraspinatus?

Suprascapular N

What are the actions of the supraspinatus?

ABDUCT HUMERUS

What is the origin of the infraspinatus?

Infraspinous fossa

What is the insertion of the infraspinatus?

GREATER TUBERCLE

What is the innervation of the infraspinatus?

Suprascapular N.

What are the actions of the infraspinatus?

LATERALLY ROTATES HUMERUS

Teres Minor

Origin: Infraspinous fossa

Insertion: GREATER TUBERCLE

Innervation: AXILLARY NERVE

Action: LATERALLY ROTATE HUMERUS

What is the origin of the teres minor?

Infraspinous fossa

What is the insertion of the teres minor?

GREATER TUBERCLE

What is the innervation of the teres minor?

AXILLARY NERVE

What are the actions of the teres minor?

LATERALLY ROTATE HUMERUS

What is the origin of the subscapularis?

Subscapular fossa

What is the insertion of the subscapularis?

Lesser Tubercle

What is the innervation of the subscapularis?

Subscapular N.

What are the actions of the subscapularis?

Medially rotate humerus