Human Muscles

Use the tabs below to view shoulder muscles and arm muscles of the upper body or scroll down the page for leg muscles and back muscles of the lower. Click on the links to view more detail including muscle origin, insertion, muscle actions and more.

Upper body, shoulder and arm muscles:

Trapezius

 

Upper back and shoulder muscle.

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Serratus anterior

 

Shoulder muscle draws the scapula forward.

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Levator scapulae

 

Neck and shoulder muscle.

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Sternocleido-mastoid

 

Prominant muscle in the neck.

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Rhomboids

 

Upper back & scapula muscle.

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Pectoralis minor

 

Small shoulder blade and chest muscle.

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Deltoid

 

Shoulder muscles which raise the arm out sidewards.

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Subscapularis

 

Rotator cuff muscle on the underside of the shoulder blade.

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Pectoralis major

 

The largest of the two chest muscles.

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Supraspinatus

 

Shoulder muscle which intiates abduction.

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Sternocleido-mastoid

 

The long strap muscle at the front of the neck.

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Teres minor

 

Shoulder muscle which rotates the humerus laterally.

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Latissimus dorsi

 

Large muscle of the lower back which attaches to the humerus.

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Infraspinatus

 

Muscle on the lower, back of the shoulder blade.

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Teres major

 

Muscle which aids the lats in extending the arm.

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Biceps Brachii

 

The main muscle which bends the arm.

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Anconeus

 

A small muscle which helps to straighten the elbow.

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Brachialis

 

Assistes Biceps in bending the arm.

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Supinator

 

Turns the palm of the hand upwards.

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Brachioradialis

 

Helps to bend and turn the hand over.

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Pronator Teres

 

Turns the hand palm down.

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Triceps Brachii

 

The main muscle for straightening the arm.

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Pronator Quadratus

 

Helps turn the hand palm downwards.

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Flexor Carpi Radialis

 

Flexes and radially deviates the wrist.

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Flexor Carpi Ulnaris

 

Flexes and ulnar deviates the wrist.

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Extensor Carpi Radialis Brevis

 

Extends and radially deviates the wrist.

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Extensor Carpi Ulnaris

 

Extends and ulna deviates the wrist.

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Extensor Digitorum Communis

 

Extends the wrist and fingers.

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Flexor Digitorum Superficialis

 

Flexes the wrist and fingers.

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Extensor Pollicis Longus

 

Extends the thumb.

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Flexor Pollicis Longus

 

Bends the thumb and helps flex the wrist.

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Extensor Carpi Radialis Longus

 

Extends and radially deviates the wrist.

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Lower body & leg muscles:

Iliopsoas

 

A deep hip/abdomen muscle which bends the hip and trunk.

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Gluteus medius

 

a small upper glute muscle - lIfts the leg out to the side.

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Biceps femoris

 

One of three hamstring muscles at the back of the thigh.

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Adductor brevis

 

One of the short groin muscles which adducts the hip.

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Gluteus minimus

 

In the upper buttock -  abducts and rotates the hip.

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Semitendinosus

 

One of three hamstring muscles at the back of the thigh.

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Sartorius

 

A muscle across the thigh that assists several movements.

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Adductor longus

 

One of the short groin muscles which helps adduct the hip.

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Gluteus maximus

 

The largest buttock muscle which extends the hip.

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Gracilis

 

A long groin muscle which helps adduct the hip.

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Rectus femoris

 

Quad muscle - flexes the hip and straightens the knee.

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Adductor magnus

 

A long groin muscle which adducts the hip.

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Piriformis

 

A small buttock muscle which rotates the hip outwards.

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Pectineus

 

A short groin muscle which helps adduct the thigh.

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Semimembranosus

 

One of three hamstring muscles at the back of the thigh.

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Tensor fascia latae

 

An outer hip muscle with a long thick tendon (ITB).

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Vastus lateralis

 

The most lateral of the four quad muscles.

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Vastus intermedius

 

The central quad muscle which straightens the knee.

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Vastus medialis

 

The most medial of the four quad muscles.

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Popliteus

 

A small, deep muscle at the back of the knee.

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Gastrocnemius

 

The largest calf muscle which raises the heel upwards.

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Peroneus brevis

 

The shorter of two peroneal muscles on the outer lower leg.

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Extensor digitorum longus

 

Muscle at the front of the shin which pulls the foot and toes up.

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Soleus

 

A deep calf muscle which raises the heel up.

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Peroneus longus

 

The larger of the two peroneal muscles which evert the foot.

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Extensor hallucis longus

 

Muscle at the front of the shin which extends the big toe.

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Tibialis posterior

 

Muscle in the calf which helps Gastrocnemius.

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Flexor hallucis longus

 

Bends the big toe and helps to plantarflex the foot.

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Tibialis anterior

 

The muscle at the front of the shin which pulls the foot up.

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Flexor digitorum longus

 

This muscle bends the toes and helps with plantarflexion.

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Rectus abdominus

 

The '6-pack' muscle at the front of the stomach.

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Internal obliques

 

Muscles at the sides of the stomach which help twist and bend.

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External obliques

 

Muscles at the sides of the stomach which help twist and bend.

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Erector spinae

 

Small muscles either side of the spine which help stabilise the it.

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Quadratus lumborum

 

Muscle between the pelvis and ribs which sidebends the trunk.

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Splenius

 

Split into two muscles: Splenius Capitus and Splenius Cervicis

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Transverse abdominus

 

Also known as TVA, the deepest core muscle.

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Multifidus

 

Small muscles which travel up the length of the spine

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