Summary Flash cards - arm, shoulder, back and neck muscles

TERES MAJOR Posterior extensor of upper arm

Origin:
• Inferior angle of scapula

Insertion:
• Intertubercular sulcus of humerus

Innervation:
• Inferior and middle subscapular
nerves

Action:
• Medial rotation and extension

SUPRASPINATUS Rotator cuff muscle

Origin:
• Supraspinous fossa

Insertion:
• Superior portion of greater
tubercle of humerus

Innervation:
• Suprascapular nerve

Action:
• Initiates abduction stabilizes
shoulder by preventing downward
dislocation

,INFRASPINATUS Rotator cuff muscle

Origin:
• Infraspinous fossa

Insertion:
• Greater tubercle under insertion of
supraspinatus

Innervation:
• Suprascapular nerve

Action:
• Lateral rotation of humerus

TERES MINOR Rotator cuff muscle

Origin:
• Lateral border of scapula

Insertion:
• Greater tubercle below
infraspinatous insertion

Innervation:
• Axillary nerve

Action:
• Lateral rotation of humerus

SUBSCAPULARIS Rotator cuff muscle

Origin:
• Subscapular fossa

Insertion:
• Lesser tubercle of humerus

Innervation:
• Subscapular nerve

Action:
• Main medial rotator of humerus

, DELTOID Posterior extensor of upper arm

Origin:
• Lateral 1/3 of clavicle



organism
• Acromion process
• Spine of scapula

mm Insertion:
• Deltoid tuberosity of humerus

Innervation:
• Axillary nerve
mmmm mm
Action:



mottos
• Primary mover of the arm &
abduction
• Flexion & medial rotation of the
arm
• Extension & lateral rotation of
arm

CORACOBRACHIALIS Anterior flexor at the shoulder

Origin:
• Coracoid process

Insertion:
• Medial midshaft of the humerus

Innervation:
• Musculocutaneous nerve

Action:
• Adduction & flexion of arm