Muscle Region

Frontalis

Wrinkles the forehead and raises eyebrows.

Occipitalis

Pulls on the galea aponeurosis when it contracts.

Orbicularis oculi

Muscle responsible for blinking.

Orbicularis oris

Muscle that purses the lips.

Levator labii superioris

Muscle that lifts the lip.

Risorius

Muscle that pulls the lip straight, contributing to smiling.

Zygomaticus major

Main muscle responsible for smiling.

Depressor Anguli Oris

Muscle that frowns by depressing the angle of the mouth.

Depressor labii inferioris

Muscle that pulls the lip downward.

Mentalis

Muscle that wrinkles the chin.

Buccinator

Muscle that assists with chewing.

Platysma

Muscle that pulls the mouth down to open wide.

Sternocleidomastoid

Muscle responsible for lateral flexion of the neck.

Splenius Capitis

Muscle that supports the head.

Trapezius

Muscle that supports the neck and upper back.

Semispinalis Capitis

Muscle that helps keep the head upright.

Diaphragm

Primary muscle for breathing.

Intercostals

Muscles that assist with rib movement during breathing.

External Abdominal Oblique

Most superficial muscle of the abdominal wall.

Internal Abdominal Oblique

Muscle located underneath the external abdominal oblique.

Transverse Abdominal

The deepest layer of the abdominal muscles.

Rectus Abdominis

Muscle that strengthens the abdominal wall.

Rectus Sheath

Connective tissue covering the rectus abdominis.

Tendinous Intersections

Divides the rectus abdominis into segments.

Linea Alba

Connective tissue that separates the rectus abdominis.

Quadratus Lumborum

Muscle providing lumbar support.

Erector Spinae

Muscle that helps maintain an upright spine.

Pectoralis Minor

Muscle located in the anterior chest.

Serratus Anterior

Muscle that pulls the scapula forward.

Trapezius

Muscle located in the posterior upper back.

Rhomboideus Major/Minor

Muscles that stabilize the scapula.

Deltoid

Major muscle of the shoulder.

Teres Major

Muscle located under the deltoid.

Supraspinatus

Rotator cuff muscle located at the top of the scapula.

Infraspinatus

Rotator cuff muscle located below the supraspinatus.

Teres Minor

Small rotator cuff muscle located below the infraspinatus.

Subscapularis

Rotator cuff muscle located at the front of the scapula.

Biceps Brachii

Muscle that flexes the elbow.

Triceps Brachii

Muscle that extends the elbow.

Brachialis

Muscle that flexes the elbow.

Brachioradialis

Elbow flexor located on the radial side of the arm.

Gluteus Maximus

The largest muscle of the butt.

Gluteus Medius

Muscle that assists with hip abduction.

Tensor Fasciae Latae

Muscle that stabilizes the hip.

Piriformis

Hip rotator muscle.

Pectineus

Muscle that pulls the thigh inward.

Adductor Magnus

Large muscle that adducts the thigh.

Adductor Brevis

Small muscle responsible for thigh adduction.

Adductor Longus

Muscle that helps pull the thigh inward.

Gracilis

Muscle that pulls the thigh toward the body.

Sartorius

The longest muscle in the body; allows crossing of legs.

Rectus Femoris

Muscle that extends the knee.

Vastus Lateralis

Muscle that extends the knee located on the lateral aspect.

Vastus Medialis

Muscle that extends the knee located on the medial aspect.

Vastus Intermedius

Deepest muscle that extends the knee.

Biceps Femoris

One of the hamstring muscles, located laterally.

Semitendinosus

Middle muscle of the hamstrings.

Semimembranosus

Medial muscle of the hamstrings.

Extensor Digitorum Longus

Muscle that extends the toes, located in the anterior leg.

Tibialis Anterior

Muscle located in the front of the lower leg that helps with dorsiflexion.

Gastrocnemius

Superficial calf muscle.

Soleus

Deep calf muscle situated beneath the gastrocnemius.

Tibialis Posterior

Muscle that is located deeper in the leg.

Flexor Digitorum Longus

Muscle that flexes the toes.

Flexor Hallucis Longus

Muscle that flexes the big toe.

Fibularis Longus

Muscle that everts the foot.

Fibularis Brevis

Muscle that assists in foot eversion.