Muscles Origins, Insertions, and Actions

Teres major origin

Scapula

Teres major insertion

Humerus

Teres major action

Extend, adduct, and medially rotate arm

Deltoid origin

Clavicle, scapula

Deltoid insertion

Humerus

Deltoid action

Abduct arm

Biceps brachii origin

Scapula

Biceps brachii insertion

Radius

Biceps brachii action

Flex elbows

Coracobrachialis origin

Scapula

Coracobrachialis insertion

Humerus

Coracobrachialis action

Adduct arm

Brachialis origin

Humerus

Brachialis insertion

Ulna

Brachialis action

Flex elbow

Triceps brachii origin

Scapula (Long), Humerus (Lat & Med)

Triceps brachii insertion

Ulna

Triceps brachii action

Flex elbow

Brachioradialis origin

Humerus

Brachioradialis insertion

Radius

Brachioradialis action

Flex elbow

External intercostal origin

Rib

External intercostal insertion

Rib

External intercostal action

Elevate ribs

Internal intercostal origin

Rib

Internal intercostal insertion

Rib

Internal intercostal action

Depress ribs

Rectus abdominis origin

Pubis

Rectus abdominis insertion

Xiphoid process, Ribs 5-7

Rectus abdominis action

Flexion of vertebral column

External abdominal oblique origin

Ribs

External abdominal oblique insertion

Linea alba, Ilium

External abdominal oblique action

Flexion and lateral rotation of Vertebral Column

Internal abdominal oblique origin

Ilium, Lumbodorsal fascia

Internal abdominal oblique insertion

Linea alba, Pubis, Ribs

Internal abdominal oblique action

Flexion and lateral rotation of Vertebral Column

Transversus abdominis origin

Ribs, Ilium, Lumbodorsal Fascia

Transversus abdominis insertion

Linea alba, Pubis

Transversus abdominis action

Compress abdomen

Pectoralis major origin

Sternum, Clavicle, Ribs

Pectoralis major insertion

Humerus

Pectoralis major action

Adduct arm

Pectoralis minor origin

Ribs 3-5

Pectoralis minor action

Protract scapula

Serratus anterior origin

Ribs 1-9

Serratus anterior insertion

Scapula

Serratus anterior action

Protract scapula

Gluteus maximus origin

Ilium, sacrum, coccyx

Gluteus maximus insertion

Femur, iliotibial tract

Gluteus maximus action

Extend hip

Gluteus medius origin

Ilium

Gluteus medius insertion

Femur

Gluteus medius action

Abduct hip

Gluteus minimus origin

Ilium

Gluteus minimus insertion

Femur

Gluteus minimus action

Abduct hip

Tensor fasciae latae origin

Ilium

Tensor fasciae latae insertion

Iliotibial tract

Tensor fasciae latae action

Tense Iliotibial tract

Piriformis origin

Sacrum

Piriformis insertion

Femur

Piriformis action

Laterally rotate hip

Trapezius origin

Occipital bone, thoracic vertebrae

Trapezius insertion

Clavicle, scapula

Trapezius action

Elevate, depress, retract, and rotate scapula; Elevate clavicle

Levator scapulae origin

Cervical vertebrae

Levator scapulae insertion

Scapula

Levator scapulae action

Elevate scapula

Rhomboid major origin

Thoracic vertebrae

Rhomboid major insertion

Scapula

Rhomboid major action

Retract scapula

Rhomboid minor origin

C7-T1

Rhomboid minor insertion

Scapula

Rhomboid minor action

Retract scapula

Latissimus dorsi origin

Lower thoracic, all lumbar vertebrae, lumbodorsal fascia, lower ribs

Latissimus dorsi insertion

Humerus

Latissimus dorsi action

Extend arm

Biceps femoris origin

Ischium (L) and femur (S)

Biceps femoris insertion

Tibia

Biceps femoris action

Flex knee

Semimembranosus origin

Ischium

Semimembranosus insertion

Tibia

Semimembranosus action

Flex knee

Semitendinosus origin

Ischium

Semitendinosus insertion

Tibia

Semitendinosus action

Flex knee

Tibialis anterior origin

Tibia

Tibialis anterior insertion

Metatarsal I

Tibialis anterior action

Dorsiflexion

Extensor digitorum longus origin

Fibula and tibia

Extensor digitorum longus insertion

Phalanges II-V

Extensor digitorum longus action

Extend phalanges

Extensor hallucis longus origin

Fibula

Extensor hallucis longus insertion

Hallux

Extensor hallucis longus action

Extend hallux

Fibularis brevis origin

Fibula

Fibularis brevis insertion

Metatarsal V

Fibularis brevis action

Plantar flexion

Fibularis longus origin

Fibula

Fibularis longus insertion

Metatarsal I