Question | Answer |
Temporalis | Origin: temporal bone
Insertion: Coronoid process of mandible
Action: Elevates mandible |
Masseter | Origin: Zygomatic arch
Insertion: Coronoid process, angle of mandible
Action: Elevates mandible |
Medial Pterygoid | O: Maxilla, palatine, & medial surface of lateral pterygoid plate
I: Ramus of the mandible
A: Side to side mastication elevates mandible |
Lateral pterygoid | O: Greater wing of sphenoid and lateral surface of lateral pterygoid plate
I: Condylar process of mandible
A: Side to side mastication depresses mandible |
Digastric | O: mental protuberance, mastoid process
I: Hyoid bone
A: Elevates hyoid |
Mylohyoid | O: Mandible
I: hyoid bone
A: elevates hyoid |
Sternocleidomastoid | O: Sternum and clavicle
I: Mastoid process
A: Head flexion/rotation |
Trapezius | O: Superior nuchal line, spinous processes of C7-T12
I: Clavicle, acromion process, and spine of scapula
A: Rotates and elevates scapula |
Levator scapulae | O: Transverse processes of C1-C4
I: Medial border of scapula
A:Raises angle of scapula |
Rhomboid major | O: Spinous processes of T2-T5
I: medial border of scapula
A: retracts scapula |
Rhomboid minor | O: Spinous processes of C7-T1
I: Medial border of scapula
A: Retracts scapula |
Serratus anterior | O: Ribs 1-8
I: Medial border of scapula
A:Protracts scapula |
Pectoralis minor | O: Ribs 3-5
I: Coracoid process of scapula
A: Stabilizes scapula |
Deltoid | O: Clavicle, acromion process and spine of scapula
I: Deltoid tuberosity
A: Abducts, flexes, and extends shoulder |
Coracobrachialis | O: Coracoid process of scapula
I: Middle medial shaft of humerus
A: Adducts humerus |
Biceps Brachii | O: Supraglenoid tubercle and coracoid process
I: Radial tuberosity
A: Flexes elbow joint, supinates forearm |
Triceps Brachii | O: Infraglenoid tubercle and shaft of humerus
I: olecranon process of ulna
A: Extends and adducts arm |
Supraspinatus | O: Supraspinous fossa
I: Greater tubercle of humerus
A: Abducts arm |
Infraspinatus | O: Infraspinous fossa
I: greater tubercle of humerus
A: adducts arm |
Teres minor | O: Lateral border of scapula
I: Greater tubercle of humerus
A: adducts arm |
Subscapularis | O: Subscapular fossa
I: Lesser tubercle of humerus
A: medially rotates arm |
Pectoralis major | O: Clavicle, sternum, ribs 2-6
I: Intertubercular groove
A: adducts humerus |
Teres major | O: Lateral border and inferior angle of scapula
I: Intertubercular groove
A: Extend, adducts, and medially rotates arm |
Latissimus dorsi | O: Spinous processes T7-T12, ribs 8-12, iliac crest, thoracolumbar fascia
I: intertubercular groove
A: primarily extends arm, adducts/rotates arm |
Brachialis | O: anterior shaft of humerus
I: Coronoid process of ulna
A: Flexion at elbow joint |
Brachioradialis | O: lateral supracondylar ridge of humerus
I: styloid process of radius
A: flexes/adducts forearm |
Supinator | O: lateral epicondyle of humerus and supinator crest
I: lateral surface of radius
A: supinates forearm and wrist |
Pronator teres | O: medial epicondyle of humerus and coronoid process of ulna
I: lateral surface of radius
A: pronates forearm and wrist |