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Muscle actions
Muscles for A&P 1 Cp 10
81
Anatomy
Undergraduate 2
11/09/2009
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Term
Temporalis
 Definition
Elevates madible
Term
Masseter
 Definition
Elevation of mandible
Term
Medial Pterygoid
 Definition
Elevation of Mandible
Term
Lateral Pterygoid
 Definition
Depression of mandible
Term
Digastric
 Definition
Depresses mandible when hyoid is fixed
Term
Mylohyoid
 Definition
Spans madible from side to side
Term
Stylohyiod
 Definition
elevates and retracts mandible
Term
Omohyoid
 Definition
Depresses hyoid after being elevated
Term
Sternohyoid
 Definition
Depresses hyoid after being elevated
Term
Diaphragm
 Definition
Prime mover of inspiration
Term
External intercostals
 Definition
Elevate and  protract 2-12 ribs
Term
Internal intercostals
 Definition
In inspiration, aids elevating ribs and expanding thoracic cavity
Term
External abdominal obliques
 Definition
Maintains posture
Term
Internal Abdominal Oblique
 Definition
Maintains Posture
Term
Orbicularis Oculi
 Definition
closes eye in blinking
Term
Obicularis oris
 Definition
Closes lips, protrudes lips
Term
Levator labii superioris
 Definition
elevates and everts upper lip
Term
Levator anguli oris
 Definition
Elevates angle in mouth
Term
Zygomaticus major
 Definition
draws angle of mouth up and laterally
Term
Zygomaticus Minor
 Definition
Elevates upper lip
Term
Depressor anguli oris
 Definition
draws angle of mouth down and laterally
Term
Depressor labii inferioris
 Definition
draws lower lip down and lateral
Term
Buccinator
 Definition
compresses cheeck against teeth and gums
Term
Platysma
 Definition
Draws lower lip and angle of mouth down
Term
Sternocleidomastoid
 Definition
Rotating the head left or right
Term
Trapezius
 Definition
Extends and laterally flexes head
Term
Splenius capitus
 Definition
Extends head
Term
Semispinalis Capitis
 Definition
Extends head
Term
Transversus Abdominal
 Definition
Compresses abdominal content
Term
Rectus abdominis
 Definition
Forward bending at waist
Term

Erector Spinae

Ilicostalis

Longissimus

Spinalis

 Definition
Extension and flexion of vetebral column
Term
Quadratus lumborum
 Definition
Bilateral Contraction extends lumbar vetebral column
Term
Ischiocavernosus
 Definition
Maintains erection
Term
Deep transverse perineal
 Definition
compresses urethrae muscle
Term
Bulbospongiosus
 Definition
Aids in erection
Term
External urethae sphincter
 Definition
Retains urine in baldder
Term
Pectoralis minor
 Definition
rotates scapule and depresses apex of shoulder
Term
Serratus Anterior
 Definition
Protracts Scapula
Term
Rhomboidus
 Definition
Retracts scapula and braces shoulder
Term
Pectoralis major
 Definition
Adducts humerus
Term
Latissimus Dorsi
 Definition
Adducts and medially rotates humerus
Term
Deltoid
 Definition
Flex and medially rotates arm
Term
Teres Major
 Definition
Extends and medially rotates humerus
Term
Coracobrachialis
 Definition
Flexes and medially rotates arm
Term

Rotator Cuff

Supraspinatus

Infraspinatus

Teres minor

Subscapularis

 Definition
Stabalizes shoulder
Term
Brachialis
 Definition
Elbow flexion
Term
Biceps Brachii
 Definition
Elbow flexion
Term
Tricep brachii
 Definition
Extends elbow
Term
Brachioradialis
 Definition
Flexes elbow
Term
Pronator quadratus
 Definition
Pronates forearm
Term
Pronator teres
 Definition
Pronates forearm
Term
Supinator
 Definition
Supinates forearm
Term
Flexor carpi Radialis
 Definition
Flexes wrist
Term
Flexor carpi ulnaris
 Definition
Flexes wrist
Term
Flexor digitorum Superficialis
 Definition
Flexes wrist
Term
Palmaris Longus
 Definition
Anchors skinand fascia of palmar region
Term
Flexor digitorum Profundus
 Definition
Flexes wrist
Term
Extensor carpi radialis longus
 Definition
Extends wrist
Term
Extensor carpi radialis brevis
 Definition
Extends wrist
Term
Extensor digitorum
 Definition
Extends wrist
Term
Extensor carpi ulnaris
 Definition
Extends wrist
Term

Iliopsoas

Iliacus

Psoas Major

 Definition
Flexes thigh at hip
Term
Tensor Fascia Latae
 Definition
Extends knee
Term
Gluteus maximus
 Definition
Abducts thigh
Term
Gluteus medius
 Definition
Abducts thigh
Term
Adductor brevis, longus, & magnus
 Definition
Adducts thigh
Term
Gracilis
 Definition
Adducts thigh
Term
Pectineus
 Definition
Adducts thigh
Term

Rectus femoris

Vastus lateralis, medialis,& intermedius

 Definition
Extends knee
Term
Sartorius
 Definition
Abducts thigh
Term
Biceps Femoris
 Definition
Flexes knee
Term
Semitendinosus
 Definition
Flexes knee
Term
Semimembranosus
 Definition
flexes knee
Term
Fibularis Tertius
 Definition
everts foot
Term
Extenor digitorum longus
 Definition
Extends toes
Term
Tibialis Anterior
 Definition
inverts foot
Term
Gastrocnemius
 Definition
Plantar flexes foot
Term
Soleus
 Definition
plantar flexes foot
Term
Flexor digitorum longus
 Definition
Flexes phalanges 2-5
Term
Tibialis Posterior
 Definition
Inverts foot
Term
Fibularis Brevis
 Definition
everts foot
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