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9.7: MODELS- Arm and Leg

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Name

Action

Origin

Insertion

Forearm movers

Biceps brachii

Flexes arm at elbow

Scapula

Radius

Brachialis

Flexes arm at elbow

Humerus

Ulna

Triceps brachii

Extends arm at elbow

Humerus & Scapula

Ulna

Pronator teres

Pronates forearm

Humerus & Ulna

Radius

Supinator

Supinates forearm

Humerus & Ulna

Radius

Brachioradialis

Flexes arm at elbow (beer raising)

Humerus

Radius

Hand & finger movers

Name

Action

Origin

Insertion

Flexor carpi radialis

Flexes & abducts hand at wrist

Humerus

Carpal Bones

Palmaris longus

Flexes hand at wrist

Humerus

Carpal Bones

Flexor carpi ulnaris

Flexes & adducts hand at wrist

Humerus

Carpal Bones

Extensor carpi radialis

Extends & abducts hand at wrist

Humerus

Carpal Bones

Extensor digitorum

Extends fingers

Humerus

Digits

Extensor carpi ulnaris

Extends & adducts hand at wrist

Humerus

Carpal Bones

Muscles of the thigh & leg

Name

Action

Origin

Insertion

Flexor digitorum longus

Flexes toes

Tibia

Digits

Flexor hallucis longus

Flexes hallux

Fibula

big toe

Tibialis anterior

Dorsiflex foot at ankle, inverts foot

Tibia

1st metatarsal

Extensor digitorum longus

Extends toes

Tibia & fibula

digits

Fibularis (peroneus) longus

plantarflexes

Tibia & fibula

1st metatarsal

Gastrocnemius

plantarflexes

Femur

calcaneous

Soleus

 

Plantarflexes

Femur & tibia

calcaneous

 

Name

Action

Origin

Insertion

Muscles of the leg & thigh

Psoas major

Flexes thigh at hip (also flexes vertebral column)

Thoracic and Lumbar Vertebrae

Femur

Iliacus

Flexes thigh at hip

Ilium

Femur

Adductor longus

Adducts thigh at hip

Pubis

Femur

Adductor magnus

Adducts thigh at hip

Pubis and Ischium

Femur

Gracilis

Adducts thigh at hip

Pubis

Tibia

Gluteus maximus

Extends thigh at hip, rotates thigh laterally

Ilium, Sacrum and Coccyx

Femur, ITB

Gluteus medius

Abducts thigh at hip, rotates thigh medially

Ilium

Femur

Sartorius

Flexes leg at knee (also flexes + rotates thigh at hip)

Ilium

Tibia

Tensor fascia latae

tenses the ITB, supports knee

Ilium

ITB

Iliotibial band (IT band/tract)

Not a muscle

n/a

n/a

 

Quadriceps femoris

Name

Action

Origin

Insertion

       

Rectus femoris

Extends leg at knee (also flexes thigh at hip)

Ilium

Tibia

Vastus lateralis

Extends leg at knee

Femur

Tibia

Vastus medialis

Extends leg at knee

Femur

Tibia

Vastus intermedius

Extends leg at knee

Femur

Tibia

 

Hamstrings

Name

Action

Origin

Insertion

       

Biceps femoris

Flexes leg at knee (also extends thigh at hip)

Ischium & Femur

Tibia & Fibula

Semitendinosus

Flexes leg at knee (also extends thigh at hip)

Ischium

Tibia

Semimembranosus

Flexes leg at knee (also extends thigh at hip)

Ischium

Tibia


This page titled 9.7: MODELS- Arm and Leg is shared under a CC BY-SA license and was authored, remixed, and/or curated by Laird C. Sheldahl.

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