Muscles of the Human Body

Flashcards on Muscles of the Human Body

Occipitofrontalis (Frontal belly)

Elevates eyebrows & wrinkles forehead

Occipitofrontalis (Occipital belly)

Tenses and retracts scalp

Orbicularis oculi

Closes eye

Orbicularis oris

Compresses & purses lips

Platysma

Depresses mandible; Pulls lower lip back & down

Masseter

Elevates mandible to close mouth

Digastric

Depresses mandible to open mouth

Omohyoid

Depresses hyoid bone

Sternohyoid

Depresses hyoid bone

Scalenes (anterior, middle & posterior)

Elevate ribs; Flex at neck

Sternocleidomastoid

Together flex at neck; Together elevate sternum & clavicle (& thus ribcage); One alone rotates & laterally flexes at neck

Rectus abdominis

Depresses ribs; Compresses abdomen; Flexes at vertebral column

External oblique

Together compress abdomen; One alone rotates & laterally flexes at vertebral column

Internal oblique

Together compress abdomen; One alone rotates & laterally flexes at vertebral column

Transversus abdominis

Compresses abdomen

Pectoralis major

Flexes, adducts & medially rotates at shoulder

Pectoralis minor

Elevates ribs; Protracts shoulder; Rotates scapula downward

Serratus anterior

Elevates ribs; Protracts shoulder; Rotates scapula upward

External intercostals

Elevate ribs

Internal intercostals

Depress ribs

Diaphragm

Expands thoracic cavity; Compresses abdominopelvic cavity

Trapezius

Elevates, adducts & depresses scapula; Extends at neck

Splenius capitis

Together extend at neck; One alone rotates & laterally flexes at neck

Levator scapulae

Elevates scapula

Rhomboid major

Adducts scapula

Rhomboid minor

Adducts scapula

Longissimus thoracis

Together extend at vertebral column; One alone laterally flexes at vertebral column

Iliocostalis thoracis

Together extend at vertebral column; One alone laterally flexes at vertebral column

Latissimus dorsi

Extends, adducts & medially rotates at shoulder

Deltoid

Whole muscle abducts at shoulder; Anterior portion flexes at shoulder; Posterior portion extends at shoulder

Subscapularis

Medially rotates at shoulder

Supraspinatus

Abducts at shoulder

Infraspinatus

Laterally rotates at shoulder

Teres minor

Laterally rotates at shoulder

Teres major

Extends, adducts & medially rotates at shoulder

Triceps brachii

Extends at elbow, extends & adducts at shoulder

Biceps brachii

Flexes at elbow & shoulder; Supinates at forearm

Brachialis

Flexes at elbow

Brachioradialis

Flexes at elbow

Pronator teres

Pronates at forearm

Supinator

Supinates at forearm

Flexor carpi radialis

Flexes & abducts at wrist

Palmaris longus

Flexes at wrist

Flexor carpi ulnaris

Flexes & adducts at wrist

Extensor carpi ulnaris

Extends & adducts at wrist

Extensor digitorum

Extends at interphalangeal joints of hand

Extensor carpi radialis brevis

Extends & abducts at wrist

Extensor carpi radialis longus

Extends & abducts at wrist

Iliacus

Flexes at hip

Psoas major

Flexes at hip; Flexes at vertebral column

Sartorius

Flexes & laterally rotates at hip; Flexes at knee

Pectineus

Flexes & adducts at hip

Adductor longus

Flexes & adducts at hip

Gracilis

Adducts at hip; Flexes at knee

Adductor magnus

Flexes & adducts at hip

Rectus femoris

Extends at knee; Flexes at hip

Vastus lateralis

Extends at knee

Vastus medialis

Extends at knee

Vastus intermedius

Extends at knee

Tensor fasciae latae

Flexes & abducts at hip

Gluteus maximus

Extends at hip

Gluteus medius

Abducts & medially rotates at hip

Piriformis

Laterally rotates at hip

Biceps femoris

Flexes at knee; Extends at hip

Semitendinosus

Flexes at knee; Extends at hip

Semimembranosus

Flexes at knee; Extends at hip

Tibialis anterior

Dorsiflexes at ankle: Inverts foot

Extensor digitorum longus

Extends at interphalangeal joints in digits 2-5 of foot

Fibularis longus (Peroneus longus)

Plantar flexes at ankle: Everts foot

Gastrocnemius

Plantar flexes at ankle; Flexes at knee

Soleus

Plantar flexes at ankle

Plantaris

Plantar flexes at ankle