Quiz 2- Muscles

Buccinator

Origin: Maxilla and mandible

Insertion: Orbicularis oris

Action: Compresses cheeks

Pectoralis Major

Origin: Clavicle, sternum and costal cartilage of the upper ribs

Insertion: Greater tubercle

Action: Flexes shoulder and aDducts the humerus

Trapezius

Origin: Occipital bone, spinous process of C7 and all thoracic vertebrae.

Insertion: Acromial extremity of clavicle, scapular spine

Action: Elevates and aDducts scapula

Sternocleidomastoid

Origin: Clavicle

Insertion: Mastoid process

Action: Flexes shoulder and neck,head and shoulders

Massater

Origin: Zygomatic arch

Insertion: Mandible

Action: Elevates mandible

Adductor longus

Origin: Pubis

Insertion: Posterior femur

Action: Adduction

Biceps femoris

Origin: Ischial tuberosity, femur

Insertion: Fibular head

Action: Flexes knee, extend hip

Deltoid

Origin: Acromion and scapular spine

Insertion: Deltoid tuberosity of humerus

Action: ABducts the humerus

Triceps branchii

Origin: Scapula and humerus

Insertion: Olecranon process of ulnar

Action: Extends elbow

Biceps branchii

Origin: Coracoid process and supra glenoid tubercle

Insertion: Radial tuberosity

Action: Flexes elbow, supinates hand and wrist

Supination

Origin: Lateral epicondyle of humerus, proximal ulna

Insertion: Proximal radius

Action: Supinates forearm