Muscles Origins and Insertions Flashcards
Trapezius
Origin: Occipital Bone
Insertion: Clavicle
Action: Rotates scapula
Rhomboideus major
Action: Raises scaupula
Levator Scapulae
Action: Elevates scapula
Serratus anterior
Origin: outer surfaces of the upper ribs
Insertion: Ventral surface of scapula
Action: Pulls scapula anteriorly and downward
Pectoralis Minor
Origin: Sternal ends of the upper rib
Insertion: Coracoid process of scapula
Action: raises ribs
Coracobrachialis
Origin: Coracoid process of scapula
Insertion: Shaft of humerus
Action: Flexes and adducts the arm
Pectoralis Major
Origin: Clavicle
Insertion: Intertubercular groove of humerus
Action: rotates arm medially
Latissimus Dorsi
Origin: lower ribs
Insertion: Intertubercular groove of humerus
Action: rotates the arm medially
Deltoid
Origin: Clavicle
Insertion: Deltoid tuberosity of the humerus
Action: flexes arm
Biceps Brachii
Origin: Coracoid Process of scapula
Insertion: Radial tuberosity of radius
Action: Flexes forearm at elbow
Brachialis
Origin: Anterior shaft of humerus
Insertion: Coronoid Process of ulna
Action: Flexes forearm at elbow
Brachioradialis
Origin: Distal lateral end of the humerus
Insertion: Lateral surface of radius above styloid process
Action: Flexes forearm at elbow
Triceps Brachiii
Origin: Tubercule below glenoid cavity
Insertion: Olecranon process of ulna
Action: Extends forearm at elbow
Supinator
Origin: Lateral epicondyle of humerus
Insertion: Lateral surface of radius
Action: Rotates forearm laterally
Pronator Quadratus
Origin: Anterior distal end of ulna
Insertion: Anterior distal end of radius
Action: Rotates forearm medially
Orbicularis Occuli
Origin: Maxillary
Insertion: Skin around eye
Action: Closes eyes as in blinking
Orbicularis Oris
Origin: Muscles near the mouth
Insertion: Skin of central lip
Action: protudes lips as for kissing
Buccinator
Origin: Outer surfaces of maxilla
Insertion: Orbicularis oris
Action: Compresses cheeks inward as when blowing air
Zygomaticus
Origin: Zygomatic Bone
Insertion: Orbicularis Oris
Action: Raises corner of mouth as when smiling
Playsma
Origin: Fascia in upper chest
Insertion: Lower border of mandible
Action: Draws angle of mouth downward as in pouting
Masseter
Origin: Lower border of zygomatic arch
Insertion: Lateral surface of mandible
Action: Elevates mandible
Temporalis
Origin: Temporal bone
Insertion: Interior rams of mandible
Action: Elevates mandible
Medial pterygoid
Action: Moves mandible from side to side
Lateral pyerygoid
Action: Depresses and protracts mandible