Human Muscle Identification Key

Occipitofrontalis

draw back the scalp to raise the eyebrow and wrinkle the forehead

Procerus

assists in flaring the nostrils

Levator labii superioris

elevates the upper lip

Zygomaticus Major

draws angle of mouth upward and laterally

Risorius

draw back angle of mouth

Depressor labii inferioris

draws the lower lip down and to the side

Depressor anguli oris (triangularis)

pulling the angle of the mouth downward

Temporalis

elevation and retraction of mandible

Orbicularis Oculi

closes the eyelids

Nasalis

compress the nasal cartilage

Masseter

causes the jaws to bite, and is the most powerful muscle of the human body

Buccinator

pull back the angle of the mouth and flatten the cheek area, assists in chewing

Orbicularis Oris

used to pucker the lips

Mentalis

elevates and wrinkles skin of chin, protrudes lowerl lip

Platysma

pulling down the mandible and pulling the corners of the lips out to the side and down

Deltoids

shoulder abduction, flexion and extension

Pectoralis Major

extends the humerus; adducts and medially rotates the humerus

Serratus anterior

stabilizes scapula; assists in moving it upward or forward

External Oblique

rotates torso

Rectus Abdominis

flexion of the trunk

Gracilis

assists with hip adduction, knee flexion, and knee internal rotation

Sartorius

flexion, external rotation and abduction of the leg

Rectus Femoris (quadriceps group)

knee extension; hip flexion

Vastus lateralis (quadriceps group)

works with the other quad muscles to help extend knee joint

Vastus medialis (quadriceps group)

extends the knee joint and it also contributes to correct tracking of the patella

Sternocleidomastoid

bend you neck and turn and tilt your head

Biceps brachii

flexes elbow; supinates forearm

Flexor carpi group

providing flexion of the wrist and assisting in abduction of the hand and wrist

Adductor Longus

adduct the thigh at the hip joint

Tibialis Anterior

dorsiflexion and inversion of the foot

Trapezius

rotation, retraction, elevation, and depression of scapula

Infraspinatus

lateral rotation of arm and abduction of arm

Latissimus Dorsi

adducts, extends and internally rotates the arm

Triceps brachii

extends forearm

Extensor Carpi Group

extend hand at wrist

Gluteals

extend and outwardly rotate hip, and extend the trunk

Semimembranosus

flexes and medially rotates the leg at the knee and extends the thigh at the hip joint

Semitendinosus

extend at the hip and flex at the knee

Biceps Femoris

flexion of the knee

Gastrocnemius

planter flexes foot, flexes knee