Muscle - Georgetown ISD
|Muscle |Origin |Insertion |Action |
|1. Frontalis |galea aponeurotica |eyebrow and nose |raises eyebrows/wrinkles forehead |
| | | | |
|2. Occipitalis |occipital and temporal bones |galea aponeurotica |pulls scalp posteriorly |
| | | | |
|3. Orbicularis oculi |frontal and maxillary bones |eyelid |squinting, blinking |
|4. Zygomaticus |zygomatic bone |skin and muscle at corner of |raises corners of mouth; smiling muscle |
| | |mouth | |
|5. Orbicularis oris |maxilla and mandible |encircles mouth |closes/purses/protrudes lips; kissing/whistling |
| | | |muscle |
|6. Masseter |zygomatic process of temporal |mandible |prime closer of jaw and elevates (raises) mandible |
| |bone and maxilla | | |
|7. Temporalis |temporal fossa |coronoid process of mandible |closes jaw, elevates and retracts (pulls back) |
| | | |mandible |
|8. Sternocleidomastoid |sternum and clavicle |mastoid process of temporal bone|flexes, rotates, tilts head |
| | |and occipital bone | |
|9. Rectus abdominis |Pubic bone and symphysis |xiphoid process and ribs |flexes, rotates vertebral column; depresses ribs; |
| | | |stabilizes pelvis when walking |
|10. External oblique |Ribs |linea alba, pubic bone, and |flexes vertebral column, compresses abdomen, rotates|
| | |iliac crest |and flexes trunk of body |
|11. Internal oblique |Lumbar fascia, iliac crest, |linea alba, pubic bone, ribs |flexes vertebral column, compresses abdomen, rotates|
| |inguinal ligament | |and flexes trunk of body |
|12. Transverse abdominis |Inguinal ligament, ribs, iliac |linea alba, pubic bone |compresses abdominal contents |
| |crest | | |
|13. Serratus anterior |Ribs |Scapula |Prime mover of scapula; raises shoulder; |
| | | |abducts/raises arm (boxer’s muscle) |
|14. Trapezius |occipital bone and thoracic |clavicle and scapula |stabilizes, raises, retracts, rotates scapula (moves|
| |vertebrae | |scapula) |
|15. Pectoralis major |Clavicle, sternum, and ribs |Humerus |flexes, rotates, adducts arms; lifts ribs upward |
|16. Latissimus dorsi |Ribs, vertebrae, and ileum |Humerus |Extends, adducts, rotates arm; pulls body up |
| | | |/forward with hands overhead |
|Muscle |Origin |Insertion |Action |
|17. Deltoid |clavicle and scapula |Humerus |Abducts arm; antagonist of pectoralis major and |
| | | |latissimus dorsi; active during arm swinging when |
| | | |walking |
|18. Teres minor |Lateral border of scapula |Humerus |Holds head of humerus in glenoid cavity; stabilizes |
| | | |shoulder; adducts/rotates arm |
|19. Teres major |Posterior surface of scapula at|Humerus |Extends, rotates, and adducts humerus |
| |inferior angle | | |
|20. Triceps brachii |Scapula and humerus |Olecranon process of ulna |Extends forearm at elbow |
|21. Biceps brachii |Coracoid process of scapula; |Radius |Flexes forearm at elbow; supinates forearm |
| |glenoid cavity; humerus | | |
|22. Sartorius |Ileum |Tibia |Flexes, abducts, rotates thigh; flexes knee |
|23. Adductor magnus |Ischium and inferior ramus of |Linea aspera and adductor |Adducts, rotates, flexes thigh |
| |pubic bone |tubercle of femur |(raises thigh towards body), and extends thigh |
| | | |(lowers thigh) |
|24. Gracilis |Ischium and inferior ramus of |Tibia |Adducts, flexes, and rotates thigh; flexes knee |
| |pubic bone | | |
|25. Quadriceps Group: |Ileum; femur |Base of patella; tibia |Extends and stabilizes knee; flexes thigh at hip |
| | | | |
|Rectus femoris | | | |
|Vastus lateralis | | | |
|Vastus medialis | | | |
|Vastus intermedius | | | |
|26. Gluteus maximus |Ileum, sacrum, coccyx |Femur |Extends, abducts, and rotates thigh |
|27. Gluteus medius |Ileum |Femur |Abducts and rotates thigh; important function of |
| | | |steadying pelvis when walking |
|28. Hamstrings: |Ischium; femur |Femur, fibula, tibia |Extends thigh; rotates leg; flexes knee |
| | | | |
|Biceps femoris | | | |
|Semitendinosus | | | |
|Semimembranosus | | | |
|29. Tibialis anterior |Tibia |Tarsus and a metatarsal bone |Flexes and inverts foot |
| | | | |
| | | | |
|Muscle |Origin |Insertion |Action |
|30. Fibularis (peroneus) longus |Fibula |Tarsus and a metatarsal bone |Plantar flexes and everts foot |
| | | | |
|31. Gastrocnemius |Femur |Calcaneus via the Achilles |Plantarflexes foot when knee extended (leg is |
| | |tendon |straight and foot bends toward tibia); flexes knee |
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Origin, Insertion, and Action Worksheet
(new book - p. 335-383; old book - p. 286-323)
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