Lab 3: Muscles of the Head, Neck, Thorax & Upper Extremity

frontalis muscle

occipitalis muscle

draws scalp posteriorly

orbicularis oculi muscle

closes eyelids, used in blinking, winking, and squinting

nasalis muscle

widens nostrils

levator labii superioris muscle

elevates upper lip

zygomaticus major muscle

retracts and elevates corner of mouth

zygomaticus minor muscle

elevates upper lip

short head of biceps brachii muscle

The first muscle that is medial, on the left.

orbicularis oris muscle

closes lips

risorius muscle

draws corner of mouth laterally

depressor labii inferioris muscle

depresses lower lip

depressor anguli oris muscle

depresses corner of mouth

temporoparietalis muscle

tenses scalp, moves auricle of ear

sternocleidomastoid muscle

flexes neck; rotates head

manubrium/clavicle

sternocleidomastoid origin

mastoid process

sternocleidomastoid insertion

flexes neck & laterally rotates cervical spine

sternocleidomastoid action

trapezius muscle

elevates, depresses, retracts, and rotates the scapula; rotates the arm

frontalis muscle

raises eyebrows, wrinkles forehead

sternocleidomastoid muscle

flexes neck; rotates head

trapezius muscle

elevates, depresses, retracts, and rotates the scapula; rotates the arm

pectoralis major muscle

adducts and flexes humerus

pectoralis minor muscle

protracts and depresses scapula

pectoralis major muscle

flexes, medially rotates & adducts arm

pectoralis minor muscle

protracts and depresses scapula

clavicle, sternum & costal cartilages

pectoralis major origin

greater tubercle of humerus

pectoralis major insertion

flexes, medially rotates & adducts the shoulder

pectoralis major action

serratus anterior muscle

pulls scapula anteriorly and downward

latissimus dorsi muscle

extends, adducts, and medially rotates the arm; draws the shoulder downward and backward

lateral serratus anterior

abduction (protraction), upward rotation

latissimus dorsi muscle

extends and adducts humerus

serratus anterior muscle

protracts scapula, assists in upward rotation of scapula

rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis

supraspinatus muscle

abduction of arm

infraspinatus muscle

adduction and lateral rotation of arm

supraspinatus muscle

abducts arm

teres minor muscle

rotates arm laterally

infraspinatus muscle

rotator cuff muscle, originates on the infraspinous fossa of the scapula and inserts on the humerus

teres minor muscle

lateral rotation at shoulder

subscapularis muscle

medially rotates arm

deltoid muscle

abducts upper arm

subscapularis muscle

medial rotation at shoulder

clavicle, acromion, & spine of scapula

deltoid origin

deltoid muscle

forms the muscular cap of the shoulder

deltoid tuberosity of humerus

deltoid insertion

abducts the shoulder

deltoid action

teres major muscle

extension, adduction, and medial rotation of arm

biceps brachii muscle

flexion and supination of forearm

teres major muscle

not a rotator cuff muscle

short head of biceps brachii muscle

the first muscle that is medial

corocoid process

origin of short head of biceps brachii

long head of biceps brachii muscle

The lateral belly of the biceps brachii muscle.

supraglenoid tubercle

origin of long head of biceps brachii

radial tuberosity

biceps brachii insertion

brachialis muscle

flexes forearm

flexes elbow & supinates proximal radioulnar joint

biceps brachii action

brachialis muscle

true flexion of elbow

coracobrachialis muscle

flexes and adducts arm

flexor carpi radialis muscle

flexes wrist and abducts hand

supinator muscle

supinates forearm

abductor pollicis longus muscle

abducts and extends thumb

adductor pollicis muscle

adducts thumb

medial head of triceps brachii muscle

O: posterior shaft of humerus

coracobrachialis muscle

flexion, adduction, horizontal adduction

triceps brachii muscle

extends forearm at elbow

lateral head of triceps brachii muscle

O: posterior shaft of humerus

long head of triceps brachii muscle

O: infraglenoid tubercle

medial head of triceps brachii muscle

O: posterior shaft of humerus

triceps brachii origin

Long head: infraglenoid tubercle

Lateral head: posterior shaft of humerus

Medial head: posterior shaft of humerus

medial head of triceps brachii muscle

O: posterior shaft of humerus

infraglenoid tubercle

long head of triceps brachii origin

posterior shaft of humerus

lateral head of triceps brachii origin

posterior shaft of humerus

medial head of triceps brachii origin

olecranon process of ulna

triceps brachii insertion

extends the elbow

triceps brachii action

superficial anterior forearm muscles

pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris

pronator teres muscle

pronates forearm

palmaris longus muscle

flexes wrist

flexor digitorum superficialis muscle

flexes wrist and middle phalanges of fingers 2-5

flexor carpi ulnaris muscle

flexion of wrist and adduction of hand

deep anterior forearm muscles

flexor digitorum profundus, flexor pollicis longus, pronator quadratus

flexor digitorum profundus muscle

flexes distal joints of fingers

flexor pollicis longus muscle

flexes distal phalanx of thumb

pronator quadratus muscle

pronates forearm

brachioradialis muscle

flexes forearm at elbow

flexor carpi ulnaris muscle

flexes wrist and adducts hand

brachioradialis muscle

flexes forearm at elbow

extensor carpi radialis longus muscle

extends and abducts wrist

extensor digitorum communis muscle

extends fingers

extensor carpi radialis brevis muscle

extends and abducts wrist

extensor digiti minimi muscle

extends little finger

extensor carpi ulnaris muscle

extends wrist and adducts hand

brachioradialis muscle

flexes forearm at elbow

anconeus muscle

extension of elbow

extensor carpi radialis brevis muscle

extends and abducts wrist

extensor carpi radialis longus muscle

extends and abducts wrist

anconeus muscle

extension of elbow

extensor digitorum communis muscle

extends fingers

extensor digiti minimi muscle

extends little finger