Transcript when thigh is flexed

MAJOR
Skeletal Muscles
of the
Human Body
Incredible
Human
Machine
 http://www.youtube.com/watch?v=6f5OvumSgc
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FRONTALIS
Raises forehead &
eyebrows;
wrinkles forehead
(horizontally)
ORBICULARIS
OCULI
Blinking,
squinting,
and draws eyebrows
inferiorly
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ZYGOMATICUS
Smiling muscle;
raises lateral corners of
mouth upward

BUCCINATOR
Draws corners of
mouth laterally;
compresses cheek when
sucking/whistling;
holds food between
teeth when chewing
ORBICULARIS
ORIS
Closes lips;
purses and protrudes lips;
kissing & whistling muscle
TEMPORALIS
Closes jaw
elevates and retracts
mandible
(as in chewing)
OCCIPITALIS
Moves scalp back
STERNOCLEIDOMASTOID
Flexes head;
helps lift head
when lying down;
tilts head to side
TRAPEZIUS
Elevates,
retracts,
depresses
and rotates shoulder
MASSETER
Elevates
mandible
Muscles Song
 https://www.youtube.com/watch?v=U6xHMX
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LATISSIMUS
DORSI
Extends & adducts arm;
depresses shoulder;
allows movements
such as striking,
hammering,
swimming,
rowing, pull-up
DELTOID
Abducts arm;
swings arms while
walking
PECTORALIS
MAJOR
Flexes arm;
adducts arm against resistance;
pulls ribcage upward;
allows movements for
climbing, throwing,
pushing, and forced
inhaling
BICEPS
BRACHII
Flexes elbow joint;
supinates forearm
Example:
open a bottle of wine,
turn the corkscrew
and pull cork
TRICEPS
BRACHII
Extends forearm
with or without
resistance
RECTUS
ABDOMINUS
Flex and rotate
lumbar region;
stabilize pelvis
during walking
EXTERNAL
OBLIQUE
Together:
Help rectus abdominus to
flex vertebral column
(bending over/back)
Separate:
Help to rotate trunk and
lateral flexion
GLUTEUS
MAXIMUS
Extends thigh;
when thigh is flexed, helps
us to climb stairs or run;
laterally rotates
and abducts thigh
RECTUS
FEMORIS
Extends knee
and flexes
thigh at hip
GRACILIS
Adducts thigh;
flexes and medially
rotates thigh;
flexes knee
SARTORIUS
Flexes, abducts,
and laterally
rotates thigh;
“tailor’s muscle” =
sitting cross-legged
BICEPS
FEMORIS
Extends thigh and
flexes knee;
laterally rotates leg
GASTROCNEMIUS
Plantar flexes foot
when knee is
extended
TIBIALIS
ANTERIOR
Dorsiflexion of foot;
inverts foot
FIBULARIS
LONGIS
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Plantar flexes
and everts foot;
helps keep flat foot
on ground