oris Buccinator Whistling, sucking, playing wind instruments, holds food between teeth Mastication Masseter Prime mover of jaw closure; elevates mandible Temporalis Jaw closure Tongue Movement Genioglossus Protrudes tongue Anteriolateral Neck Sternocleidomastoid Head rotation (nodding and side to side) Thorax: Breathing External Intercostals Pulls ribs toward one another to elevate the rib cage Internal Depress rib cage Intercostals Diaphragm Prime mover of ribs during inhalation Anterior/Posterior Thorax Pectoralis minor If ribs are stationary = draws scapula forward & downward If scapula are stationary = draws rib cage forward Trapezius Stabilizes, raises, retracts, rotates scapula; raise/shrug shoulders, extend head Crossing Shoulder Pectoralis major Primary mover for shoulder; prime mover of arm flexing Joint/Movement of Humerus Latissimus Prime mover of arm extension (lets arm move behind back) dorsi Deltoid Arm extension Anterior/Lateral Abdominal Rectus abdominus Bend forward at the waist; fix & depress ribs, stabilize pelvis Wall Abdominal Helps muscles of back in abdominal rotation (side to side) oblique Muscles Crossing Elbow Triceps brachii Prime mover of forearm/elbow extension, stabilizes shoulder Joint/Flexion & Extension of Forearm Biceps Flexes forearm brachii Brachialis Major forearm flexor Muscles of Pronator teres Pronates forearm Forearm/Movements of Wrist, Hand, Fingers Flexor carpi Flexor of wrist, abducts hand radialis
oris Buccinator Whistling, sucking, playing wind instruments, holds food between teeth Mastication Masseter Prime mover of jaw closure; elevates mandible Temporalis Jaw closure Tongue Movement Genioglossus Protrudes tongue Anteriolateral Neck Sternocleidomastoid Head rotation (nodding and side to side) Thorax: Breathing External Intercostals Pulls ribs toward one another to elevate the rib cage Internal Intercostals Depress rib cage Diaphragm Prime mover of ribs during inhalation Anterior/Posterior Thorax Pectoralis minor If ribs are stationary = draws scapula forward & downward If scapula are stationary = draws rib cage forward Trapezius Stabilizes, raises, retracts, rotates scapula; raise/shrug shoulders, extend head Crossing Shoulder Joint/Movement of Humerus Pectoralis major Primary mover for shoulder; prime mover of arm flexing Latissimus dorsi Prime mover of arm extension (lets arm move behind back) Deltoid Arm extension Anterior/Lateral Abdominal Wall Rectus abdominus Bend forward at the waist; fix & depress ribs, stabilize pelvis Abdominal oblique Helps muscles of back in abdominal rotation (side to side) Muscles Crossing Elbow Joint/Flexion & Extension of Forearm Triceps brachii Prime mover of forearm/elbow extension, stabilizes shoulder Biceps brachii Flexes forearm Brachialis Major forearm flexor Muscles of Forearm/Movements of Wrist, Hand, Fingers Pronator teres Pronates forearm Flexor carpi radialis Flexor of wrist, abducts hand