MUSCLES OF THE BODY
You need to be able to know the
location and action of these
muscles!!!
Occipitalis
Wrinkle forehead, elevate eyebrow
Frontalis
Wrinkle forehead, elevate eyebrow
Orbicularis Oculi
Blinks eye
Orbicularis Oris
Closes Lips
Buccinator
Compresses cheek
Zygomaticus
Helps to smile
(lift corners of lips)
Platysma
Helps to frown
(lower corners of lips)
Temporalis
Close jaw
Masseter
Close jaw
Sternocleidomastoid
Flex neck and rotate head
Trapezius
Extends head, rotates and adducts scapula
Latissimus Dorsi
Extend, adduct & rotate arm medially
Deltoid
Abducts & flexes arm
Pectoralis Major
Flexes, adducts & rotates arm medially
Rotator Cuff
Group of 4 muscles that rotates & stabilizes arm
Supraspinatus, Infraspinatus, Subscapularis, Teres Minor
Erector Spinae
Rotates and extends vertebral column and
head
External Intercostals
Elevate ribs (inspiration)
Internal Intercostals
Depress ribs (forced expiration)
Diaphragm
Inspiration
Rectus Abdominis
Flexes & compresses abdomen
External Oblique
Compresses abdomen
Internal Oblique
Compresses abdomen
Transversus Abdominis
Compresses abdomen
Biceps Brachii
Flexes elbow joint (forearm)
Triceps Brachii
Extend elbow joint (forearm)
Brachialis
Flexes elbow joint (forearm)
Brachioradialis
Flexes elbow joint (forearm)
Forearm Muscles
• Flexor carpi ulnaris –
flexes wrist
• Flexor carpi radialis –
flexes wrist
Forearm Muscles
• Extensor carpi radialis extends wrist
Forearm Muscles
• Extensor carpi ulnaris extends wrist
Forearm Muscles
• Flexor digitorum flexes fingers
Forearm Muscles
• Extensor digitorum extends fingers
Right Arm,
Anterior Side
(Palm side up)
Right Arm,
Posterior Side
(Palm side
down)
Gluteus Maximus
Extends & rotates thigh laterally
Gluteus Medius
Abducts & rotates thigh
Upper Leg Muscles
Rectus Femoris
Flexes Thigh, Extends Lower Leg
(part of quadriceps)
Vastus Lateralis
Extends Lower Leg
(part of quadriceps)
Vastus Medialis
Extends Lower Leg
(part of quadriceps)
The 4th muscle
of the “quad”
group is the
Vastus
Intermedius,
which is hidden
below the other
three!
1. vastus medialis
2. vastus lateralis
3. vastus intermedius
4. rectus femoris
Sartorius
Flexes & laterally rotates thigh
(longest muscle of the body!)
Adductor Muscles
Adducts thigh
Gracilis, Adductor Magnus, Adductor Longus, Adductor Brevis
Biceps Femoris
Flex knee and extend hip
(part of hamstring group)
Semimembranosus
Flex knee and extend hip
(part of hamstring group)
Semitendinosus
Flex knee and extend hip
(part of hamstring group)
Tibialis Anterior
Dorsiflexes and inverts foot
Gastrocnemius
Plantar flexes foot & flex lower leg
(calf muscle)
Soleus
Plantar flexes foot
Fibularis Longus
Plantar flexes & everts foot
Extensor Digitorum Longus
Extends toes