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Anatomy muscles
muscles
86
Anatomy
Undergraduate 1
10/04/2012

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Term
occipitofrontalis
Definition
pulls up eyebrows
Term
occipital body of occiptofrontalis
Definition
retracts scalp at base of skull
Term
frontal belly of occipitofrontalis
Definition
moves scalp, wrinkles skin of forehead, raises eyebrows
Term
orbicularis oculi
Definition
blinks / closes eye
Term
orbicularis oris
Definition
compresses and purses lips, puckers lips; closes mouth / kiss
Term
platysma
Definition
tenses skin of neck; shaving muscle
Term
temporalis
Definition
elevates and retracts the mandible
Term
buccinator
Definition
lines inside of cheeks, keeps food in your mouth
Term
masseter
Definition
prime mover of jaw closure; chewing --> can become enlarge
Term
genioglossus
Definition
sticks tongue out
Term
hyoglossus
Definition
pulls tongue in; stability muscle because it is attached to the hyoid
Term
digastric, mylohyoid, stylohyoid, geniohyoid
Definition
suprahyoid muscles that elevates the hyoid bone
Term
digastric
Definition
active when you open your mouth really wide (more than gravity would)
Term
mylohyoid
Definition
providing support; elevates floor of mouth
Term
sternohyoid, thyrohyoid, sternothyroid, omohyoid
Definition
infrahyoid muscles: supportive muscles that help support hyoid and tongue; depresses hyoid bone
Term
sternocleidomastoid
Definition
unilateral action: lateral flexion to the same side; rotation of head to opposite side (if you activate one)
bilateral action: flexes neck (if you activate both)
Term
splenius capitus
Definition
comes off bones of vertebral column and attaches to mastoid

unilateral action: turns head to the same side
bilateral action: extends head / neck
Term
scalene muscles
Definition
work with sternocleidomastoid to flex neck; elevate ribs 1 & 2 during forced inhalation
Term
erector spinae (3 muscles)
Definition
start from sacrum, attach to different points on ribs, go all the way to the neck

predominanly slow fibers-- don't fatigue

holds extension of the back (maintains posture)
Term
quadratus lumborum
Definition
when working alone, laterally flex to the same side

when working together help extend vertebral column
Term
external intercostals
Definition
angled down towards midline

contract --> expand rib cage --> inspiration (inhalation) --> FORCED inspiration (running)
Term
internal intercostals
Definition
deep to external and run in perpendicular pattern

depress the ribs --> FORCED expiration
Term
diaphragm
Definition
dome-shaped muscle that forms a partition between the thoracic and abdominopelvic cavities

when it contracts, it pulls lungs down, and brings air in

blowing air out = diaphragm not active
Term
abdominal muscles
Definition
compress abdomen, giving increased pressure in the thorax, helping to force air out

external obliques, internal obliques, rectus abdominis, transversus abdominis

when all work together, compress abdomen and flex vertebral column
Term
external obliques
Definition
lateral flexion of vertebral column and rotation to opposite side

start high laterally, finish low medially (direction of hands in pockets)
Term
internal obliques
Definition
deep and at right angles to external

lateral flexion of vertebral column and rotation to same side
Term
rectus abdominis
Definition
flexion of vertebral column and compression of abdominal wall; 6 pack abs
Term
transversus abdominis
Definition
lateral flexion to the same side; deepest of abdominal muscles
Term
trapezius
Definition
large muscle that extends from middle of back to spine of scapula laterally to back of head

elevates, rotates, and retracts scapula
flexes and extends neck
shrugs shoulders
Term
rhomboids (major, minor)
Definition
parallelogram muscles

retract scapula; tip scapula downward (rotate it down)
Term
levator scapulae
Definition
narrow, elongated muscle

elevates scapula; helps shrug shoulders with trapezius
Term
pectoralis minor
Definition
thin, flat, triangular muscle deep to pectoralis major; ribs to coracoid process

protracts and depresses scapula
Term
serratus anterior
Definition
comes off medial border of scapula on anterior surface, attaches onto ribs

scapula protraction primarily; helps hold scapula towards rib cage; draws it forward
Term
deltoid
Definition
thick, powerful muscle
abducts, flexes, and extends arm

anterior fibers: flex arm
middle fibers: prime movers of arm abduction
posterior fibers: extend arm
Term
pectoralis major
Definition
large, thick, fan-shaped muscle covering superior thorax

prime mover of arm flexion
adducts arm
Term
coracobrachialis
Definition
weak arm flexor, but it is all it does
Term
biceps brachii
Definition
2 headed muscle on anterior surface of humerus

flexes forearm; flexes arm
crosses shoulder joint; acts on elbow joint and flexion of elbow joint
attaches radius and pulls it into supination
Term
latissimus dorsi
Definition
broad, triangular shaped muscle on inferior part of back; swimmer's muscle

arm extension primarily, but also adduction

important for pull-ups
Term
teres major
Definition
arm adduction primarily, but also arm extension
Term
Rotator cuff muscles
Definition
subscapularis, supraspinatus, infraspinatus, teres minor

critical for overhead motion (throwing)

1. provide large amount of stability
2. slowing down arm after going through a really fast rotational movement (pitching)
Term
subscapularis
Definition
winding up a pitch; medially rotates arm; anterior surface
Term
supraspinatus
Definition
starting to execute the pitch; beginning of arm abduction
Term
infraspinatus
Definition
helps slow down arm after completing the pitch; adducts and laterally rotates the arm
Term
teres minor
Definition
helps slow down arm after completing pitch; adducts and laterally rotates arm
Term
brachialis
Definition
deep to biceps brachii

primary flexor of forearm at elbow
Term
brachioradialis
Definition
distal muscle -- distal end of humerus to wrist

flexes forearm (weak)
lets your hold a frosty mug of root beer
Term
triceps brachii
Definition
3 headed muscle that crosses the glenohumeral joint

primary extensor of forearm
also extends and adducts arm
Term
supinator
Definition
posterior origin; attaches to radius and wraps around it

supinates forearm
Term
pronator teres & pronator quadratus
Definition
anterior forearm muscles; pronates forearm; deep and pull into pronation
Term
flexor carpi radialis
Definition
crosses wrist and attaches to radial side of thumb

ABDUCTS the hand at the wrist
Term
flexor carpi ulnaris
Definition
comes to the ulnar / pinky side

ADDUCTS the hand at the wrist
Term
flexor digitorum superficialis
Definition
large muscle

extends tendons and fingers 2-5 and flexes them
Term
flexor digitorum profundus
Definition
deep to flexor digitorum superficialis

flexes wrist, 2nd-5th MP joints
Term
flexor retinaculum
Definition
band of tissue on palm up side holding down tendons

forms carap tunnel
Term
extensor digitorum
Definition
extends wrist; extends tendons to fingers 2,3,4
Term
extensor retinaculum
Definition
band of connective tissue palm side down
Term
abductor pollicis longus
Definition
abducts thumb
Term
extensor pollicis longus
Definition
adducts thumb; extends thumb
Term
thenar muscles
Definition
at the base of the thumb; bulgy part on plam before thumb
Term
hypothenar muscles
Definition
hypothenar eminence going to pinky
Term
lumbricals
Definition
muscles in palm of hand; come off flexor tendon

help flex fingers
Term
palmar interossei
Definition
deepest muscles

ADDUCTS fingers (PAD = palmar adduct)
Term
dorsal interossei
Definition
deepest muscles

ABDUCTS fingers (DAB = dorsal abduct)
Term
psoas (major and minor)
Definition
comes off vertebral column and attaches to femur

flexes hip
Term
iliacus
Definition
comes off iliac crest and attaches to femur

flexes hip
Term
adductors
Definition
adducts the thigh

brings femur back towards midline
Term
gracilis
Definition
runs from pubis to tibia; crosses multiple joints

helps adduct thigh
flexes knee
flexes thigh
Term
gluteus medius
Definition
deep to gluteus maximus

powerful abductor of the thigh
Term
tensior fasciae latae
Definition
connects to lateral side of knee, snapping at knee or greater trochanter of femur

buried in long band of connective tissue (IT band)

ABDUCTION of the thigh
Term
gluteus maximus
Definition
largest of 4 gluteal muscles

major hip extensor; also lateral rotation of thigh
Term
hamstrings
Definition
collectively flex the knee

semitendinosus, semimembranosus, biceps femoris
Term
biceps femoris
Definition
2 headed muscle that inserts on lateral side of leg

extension of hip
Term
popliteus
Definition
random muscle, not paired

superficial muscle that is important in rotating tibia (medially)

makes knee more stable
Term
sartorius
Definition
flexes hip and knee; laterally rotates thigh

when you cross your legs
Term
quadriceps femoris
Definition
all use quadriceps (patellar) tendon; attach to tibial tuberosity
EXTEND KNEE; most powerful muscle in body

rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
Term
rectus femoris
Definition
central quadricep and only one that crosses the hip joint, so can help with some flexion
Term
tibialis anterior
Definition
lateral to crest running down shin

primary dorsiflexor of the foot at ankle
Term
extensor digitorum longus
Definition
4 long tendons to attach to dorsal surface of toes 2-5

extends toes; dorsiflexes foot
Term
extensor hallucis longus
Definition
extends big toe

dorsiflexes foot
Term
gastrocnemius
Definition
most superficial muscle on the superficial posterior compartment of the leg

plantar flexes foot
crosses back side of knee and flexes knee
achilles tendon
Term
soleus
Definition
broad, flat muscle deep to gastrocnemius

plantar flexes foot
does not cross knee, so does not flex it
Term
fibularis longus and fibularis brevis
Definition
work together for plantar flexion (pointing toe or standing on toe) and attach to outside of ankle

eversion (draw ankle out) ***

want to evert foot, but most active when rolling ankle in (eccentric)
Term
flexor digitorum longus
Definition
attaches to distal phalanges of toes 2-5; plantar flexion of foot
Term
tibialis posterior
Definition
deepest of posterior compartment muscles; plantar flexion of foot
Term
flexor hallucis longus
Definition
plantar flexion of foot and flexes the great toe
Term
plantar aponeurosis
Definition
supports the plantar surface of the foot
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