a&p lab exam 3 (functions)

frontalis

raises eyebrows & wrinkles forehead

occipitalis

pulls scalp backwards (posteriorly)

orbicularis oris

closes and puckers lips (kissing)

zygomaticus major

lifts corners of mouth (smiling)

buccinator

compresses cheeks (bowing & sucking)

platysma

pulls lower lip down and back (pouting) & depresses jaw

orbicularis oculi

closes eyes

corrugator supercilii

frowns (draws eyebrows down & together)

masseter

elevates jaw (closes mouth)

temporalis

elevates and retracts mandible (jaw)

digastric

elevates hyoid bone & depresses mandible

sternocleidomastoid

acting together, flex cervical vertebral column & head

iliocostalis (lateral) group

acting together, extends & keep the spine upright (maintain posture)

longissimus (intermediate group)

acting together, extend head & vertebral column

spinalis (medial group)

acting together, extend the vertebral column

diaphragm

contracts: flattens to enlarge thoracic cavity (inhalation)

relaxes: moves up to shrink thoracic cavity (exhalation)

external intercostals

raise ribs to expand chest (inhalation)

internal intercostals

draw ribs together to compress chest (exhalation)

rectus abdominis

flexes spine & compresses abdomen

external oblique

acting together, compress abdomen

internal oblique

acting together, compress abdomen

transversus abdominis

compresses abdomen

pectoralis minor

fixator of scapula

serratus anterior

fixator of scapula

trapezius

fixator of scapula

levator scapulae

fixator of scapula

rhomboid major

fixator of scapula

rhomboid minor

fixator of scapula

pectoralis major

abducts & medially rotates arm

latissimus dorsi

extends, abducts & medially rotates arm

deltoid

abducts arm

supraspinatus

assists deltoid muscle in abducting arm

infraspinatus

laterally rotates arm

subscapularis

medially rotates arm

biceps brachii

flexes forearm

brachialis

flexes forearm

brachioradialis

flexes forearm

triceps brachii

extends forearm

pronator teres

pronates forearm

supinator

supinates forearm

palmaris longus

flexes hand at wrist joint

flexor carpi radialis

flexes and abducts hand at wrist joint (radial deviation)

flexor carpi ulnaris

flexes and adducts hand at wrist joint (ulnar deviation)

extensor digitorum

extends hand at wrist joint

extensor carpi radialis longus

extends and abducts hand at wrist joint (radial deviation)

extensor carpi ulnaris

extends and abducts hand at wrist joint (ulnar deviation)

psoas major (part of iliopsoas)

flexes thigh

iliacus (part of iliopsoas)

flexes thigh

gluteus maximus

extends thigh

gluteus medius

abducts thigh

tensor fascia latae

abducts thigh

adductor longus

abducts thigh

adductor magnus

abducts thigh

gracilis

abducts thigh

quadriceps femoris (rectus femoris)

extends leg

quadriceps femoris (vastus lateralis)

extends leg

quadriceps femoris (vastus medialis)

extends leg

quadriceps femoris (vastus intermedius)

extends leg

sartorius

flexes leg

biceps femoris

flexes leg

semitendinosus

flexes leg

semimembranosus

flexes leg

tibalis anterior

dorsiflexes foot

extensor digitorum longus

dorsiflexes foot

tibalis posterior

plantar flexes foot

fibularis longus

plantar flexes foot

fibularis brevis

plantar flexes foot

gastrocnemius

plantar flexes foot

soleus

plantar flexes foot

flexor hallucis longus

dorsiflexes big toe