Origin: cervical vertebrae
Insertion: upper surface of 1st rib
Action: lateral neck flexion, elevation of 1st rib
Innervation: check if we have to know!
Back
Trapezius
Front
Origin: EOP, cervical and thoracic spinous processes
Insertion: Lateral 1/3rd of clavicle, acromion process, spine of scapula
Action: Elevates, depresses and retracts scapula
Innervation CN XI Accessory nerve
Back
Deltoid
Front
Origin: Clavicle, acromion, scapular spine
Insertion: Deltoid tuberosity of humerus
Action: Anterior: Flexion and internal rotation
Posterior: extend and laterally rotate
Intermediate: abduction
Innervation: Axillary Nerve
Back
Coracobrachialis
Front
Origin: coracoid process of scapula
Insertion: mid-shaft of medial surface of humerus
Action: shoulder/arm flexion and adduction
Innervation: musculocutaneous nerve
Origin: anterior aspect of 2nd to 5th rib
Insertion: Coracoid process of scapula
Action: Minor adductor, downward rotator of the glenoid
Innervation: Medial pectoral nerve
Back
Supraspinatus
Front
Origin: Supraspinous fossa of scapula
Insertion: Greater tubercle of humerus
Action: abducts and stabilizes shoulder
Innervation: Suprascapular nerve
Back
Rhomboid Minor
Front
Origin: cervical and first thoracic spinous processes
Insertion: Medial border of scapula
Action: Retracts scapula
Innervation: Dorsal scapular nerve
Origin: Infraspinous fossa of scapula
Insertion: Greater tubercle of humerus
Action: Lateral rotator of shoulder
Innervation: Suprascapular nerve
Back
Anterior scalene
Front
Origin: cervical vertebrae
Insertion: scalene tubercle, 1st rib
Action: anterior/lateral neck flexion, elevation of 1st rib
Innervation: check if we have to know!
Back
Teres Minor
Front
Origin: Lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Lateral rotator of shoulder
Innervation: Axillary nerve
Back
biceps brachii
Front
Origin: long head: superaglenoid tubercle of scapula; short head: coracoid process
Insertion: radial tuberosity
Action: elbow flexion, some shoulder extension
Innervation: musculocutaneous nerve
Back
Teres Major
Front
Origin: Lower lateral border of scapula
Insertion: Lateral edge of intertubercular groove
Action: shoulder ADduction and internal rotation
Innervation: Lower subscapular nerve
Back
Sternocleidomastoid
Front
Origin: Sternum and clavicle
Insertion: Mastoid process
Action: Bilaterally flexes head, raises thorax. Unilaterally turns face towards opposite side
Innervation: accessory nerve (XI)
Back
brachialis
Front
Origin: distal half of anterior surface of humerus
Insertion: coronoid process and tuberosity of ulna
Action: elbow flexion
Innervation: musculocutaneous nerve
Back
Omohyoid Muscle
Front
Origin: Upper border of scapula
Insertion: ----
Action: Depresses hyoid bone
Innervation: ansa cervicalis
Back
Erector Spinae
Front
Origin: Sacrum, ilium, vertebrae, ribs
Insertion: mastoid process, vertebrae, ribs
Action: Extend the neck and trunk, ipsilateral bending and rotating of spine, maintain posture
Innervation: dorsal rami of spinal nerves
Back
Levator Scapulae
Front
Origin: Transverse processes of cervical vertebrae
Insertion: Superior medial border and superior angle of scapula
Action: Elevates scapula
Innervation: Dorsal scapular nerve
Back
Pectoralis Major
Front
Origin: Clavicle, sternum, ribs
Insertion: intertubercular groove of humerus
Action: Shoulder adduction, flexion and internal rotation
Innervation: Lateral and medial pectoral nerves
Back
Serratus Anterior
Front
Origin: Lateral surface of ribs
Insertion: Anterior surface of the medial border of scapula
Action: Protracts and stabilizes scapula
Innervation: Long thoracic nerve
Back
triceps brachii - long head
Front
Origin: glenoid fossa
Insertion: olecranon process of ulna
Action: elbow extension (minor shoulder extension and adduction)
Innervation: radial nerve
Back
Subscapularis
Front
Origin:Subscapular fossa
Insertion: Lesser tubercle of Humerus
Action: Medial rotation of humerus
Innervation: Upper and lower subscapular nerves