Muscles: Origin, Insertion, Innervation
Anterior deltoid Origin: anterior surface of lateral 1/3 of clavicle Insertion: deltoid tuberosity of humerus Innervation: axillary Actions: shoulder flexion, medial rotation of humerus
What is this muscle? Origin, insertion, innervation, & actions?
Biceps brachii Origin: short head- coracoid process of scapula; long head- supraglenoid tubercle of scapula Insertion: tuberosity of radius Innervation: Musculocutaneous Actions: shoulder flexion, flexion and supination of forearm
What is this muscle? Origin, insertion, innervation, & actions?
Middle trapezius Origin: C7-T5 Insertion: spine of scapula Innervation: spinal accessory Actions: retraction
What is this muscle? Origin, insertion, innervation, & actions?
Rhomboid Origin: C7-T5 Insertion: vertebral border between root of spine and inferior angle of scapula Innervation: dorsal scapular Actions: retraction, elevation, downward rotation
What is this muscle? Origin, insertion, innervation, & actions?
Latissimus dorsi Origin: T6-T12 spinous processes/last 3or4 ribs/thoracolumbar fascia from lumbar & sacral vertebrae Insertion: Innervation: Actions:
What is this muscle? Origin, insertion, innervation, & actions?
Lower trapezius Origin: T6-T12 Insertion: root of spine of scapula Actions: depression, retraction, upward rotation of scapula
What is this muscle? Origin, insertion, innervation, & actions?
Pectoralis minor Origin: outer surfaces of ribs 3,4, &5 near costal cartilages Insertion: coracoid process of scapula Innervation: medial pectoral Actions: tilts scapula anteriorly
What is this muscle? Origin, insertion, innervation, & actions?
Posterior deltoid Origin: inferior lip of the spine of the scapula Insertion: deltoid tuberosity of humerus Innervation: axillary Actions: shoulder extension and lateral rotation of humerus
What is this muscle? Origin, insertion, innervation, & actions?
Serratus anterior Origin: outer surfaces of upper 8 or 9 ribs Insertion: costal surface of medial border of scapula Innervation: long thoracic Actions: protraction, upward rotation
What is this muscle? Origin, insertion, innervation, & actions?
Levator scapulae Origin: C1-C4 Insertion: vertebral border of scapula between superior angle and root of spine Innervation: dorsal scapular Actions: elevation and downward rotation
What is this muscle? Origin, insertion, innervation, & actions?
Medial deltoid Origin: lateral surface of acromion process Insertion: deltoid tuberosity of humerus Innervation: axillary Actions: aBduction of humerus
What is this muscle? Origin, insertion, innervation, & actions?
Origin: Insertion: Innervation: Actions:
What is this muscle? Origin, insertion, innervation, & actions?
Pectoralis Major Origin: medial half of clavicle, lateral sternum, cartilage of ribs 1-6 Insertion: greater tubercle of humerus Innervation: pectoral Action: shoulder flexion, shoulder adduction, medial rotation of humerus, horizontal adduction.
What is this muscle? Origin, insertion, innervation, & actions?
Triceps brachii Origin: Insertion: Innervation: Actions:
What is this muscle? Origin, insertion, innervation, & actions?
Upper trapezius Origin: nuchal line-C7 Insertion: acromion process of scapula Innervation: spinal accesory Actions: elevation and upward rotation of scapula
What is this muscle? Origin, insertion, innervation, & actions?
