MUSCLES OF THE BODY You need to be able to know the location and action of these muscles!!!

Wrinkle forehead, elevate eyebrow Occipitalis Wrinkle forehead, elevate eyebrow

Wrinkle forehead, elevate eyebrow Frontalis Wrinkle forehead, elevate eyebrow

Orbicularis Oculi Blinks eye

Orbicularis Oris Closes Lips

Buccinator Compresses cheek

Helps to smile (lift corners of lips) Zygomaticus Helps to smile (lift corners of lips)

Helps to frown (lower corners of lips) Platysma Helps to frown (lower corners of lips)

Temporalis Close jaw

Masseter Close jaw

Flex neck and rotate head Sternocleidomastoid Flex neck and rotate head

Extends head, rotates and adducts scapula Trapezius Extends head, rotates and adducts scapula

Extend, adduct & rotate arm medially Latissimus Dorsi Extend, adduct & rotate arm medially

Deltoid Abducts & flexes arm

Flexes, adducts & rotates arm medially Pectoralis Major Flexes, adducts & rotates arm medially

Rotator Cuff Group of 4 muscles that rotates & stabilizes arm Supraspinatus, Infraspinatus, Subscapularis, Teres Minor

Rotates and extends vertebral column and head Erector Spinae Rotates and extends vertebral column and head

External Intercostals Elevate ribs (inspiration)

Internal Intercostals Depress ribs (forced expiration)

Diaphragm Inspiration

Flexes & compresses abdomen Rectus Abdominis Flexes & compresses abdomen

External Oblique Compresses abdomen

Internal Oblique Compresses abdomen

Transversus Abdominis Compresses abdomen

Flexes elbow joint (forearm) Biceps Brachii Flexes elbow joint (forearm)

Extend elbow joint (forearm) Triceps Brachii Extend elbow joint (forearm)

Flexes elbow joint (forearm) Brachialis Flexes elbow joint (forearm)

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)

Extends & rotates thigh laterally Gluteus Maximus Extends & rotates thigh laterally

Abducts & rotates thigh Gluteus Medius Abducts & rotates thigh

Upper Leg Muscles

Flexes Thigh, Extends Lower Leg (part of quadriceps) Rectus Femoris Flexes Thigh, Extends Lower Leg (part of quadriceps)

Extends Lower Leg (part of quadriceps) Vastus Lateralis Extends Lower Leg (part of quadriceps)

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

Flexes & laterally rotates thigh (longest muscle of the body!) Sartorius Flexes & laterally rotates thigh (longest muscle of the body!)

Gracilis, Adductor Magnus, Adductor Longus, Adductor Brevis Adductor Muscles Adducts thigh Gracilis, Adductor Magnus, Adductor Longus, Adductor Brevis

Flex knee and extend hip (part of hamstring group) Biceps Femoris Flex knee and extend hip (part of hamstring group)

Flex knee and extend hip (part of hamstring group) Semimembranosus Flex knee and extend hip (part of hamstring group)

Flex knee and extend hip (part of hamstring group) Semitendinosus Flex knee and extend hip (part of hamstring group)

Dorsiflexes and inverts foot Tibialis Anterior Dorsiflexes and inverts foot

Plantar flexes foot & flex lower leg (calf muscle) Gastrocnemius Plantar flexes foot & flex lower leg (calf muscle)

Soleus Plantar flexes foot

Plantar flexes & everts foot Fibularis Longus Plantar flexes & everts foot

Extensor Digitorum Longus Extends toes