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Muscles: function
Origin, Insertion, and Function
| Question | Answer |
|---|---|
| Zygomaticua major | elevates corners or mouth |
| Zygomaticus major | originates at zygomatic bone and inserts at angle of mouth |
| Orbicularis oculi | originates at medial margin of orbit and inserts at skin around eyelids |
| Orbicularis oculi | closes eyes |
| Masseter | elevates mandible/closes jaw |
| Styloglossus | originates at styloid process and inserts along the side to tip & base of tongue |
| Styloglossus | retracts tongue, elevates sides |
| Digastric | depresses mandible, opening mouth or elevates larynx |
| Geniohyoid | depresses mandible and retracts hyoid bone |
| Mylohyoid | elevates floor of mouth, elevates hyoid bone |
| Sternocleidomastoid | flex neck; neck toward shoulder & turns head |
| Splenius | extend neck; rotate & laterally flex neck |
| Longissimus capitis | extend neck; rotate & laterally flex neck |
| Semispinalis capitis | extends & laterally flexes neck; turns head to opposite side |
| Mulitfidus | extends vertebral column and rotates toward opposite side |
| External oblique | originates at external & inferior borders of ribs 5-12 |
| External oblique | compresses abdomen; depresses ribs |
| Rectus abdominis | originates at superior surface of pubis, inserts @ inferior surfaces of cartilage (ribs 5-7) & xiphoid process of sternum |
| Rectus abdominis | depressed ribs; flexes vertebral column |
| Pectoralis minor | anterior, superior ribs and fascia to coracoid process of scapula |
| Pectoralis minor | depresses and protracts shoulder; elevates ribs if scapula stationary |
| Rhomboid major | ligamentum nuchae & spinous process T2-T5 to vertebral border scapula |
| Rhomboid major | adducts & performs downward rotation of scapula |
| Coracobrachialis | adduction & flexion at shoulder |
| Deltoid | abduction of shoulder; flexion or extension & medial or lateral rotation of humerus |
| Supraspinatus | abduction at shoulder |
| Subscapularis | medial rotation at shoulder |
| Latissimus dorsi | extension, adduction & medial rotation at shoulder |
| Biceps brachii | coracoid process to radial tuberosity |
| Biceps brachii | flexion at elbow & shoulder; supination |
| Brachioradialis | flexion at elbow |
| Anconeus | extension at elbow |
| Triceps brachii | humerus & infraglenoid tubercle to olecranon of ulna |
| Triceps brachii | extension at elbow; extension & adduction at shoulder |
| Pronator teres | pronates forearm and hand & flexion at elbow |
| Tensor fascie latae | iliac crest & iliac spine to iliotibial tract |
| Tensor fascie latae | abduction at hip; extension and lateral rotation at knee |
| Pectineus | flexion and adduction at hip |
| Gracilis | flexion & medial rotation at knee; adduction and medial rotation at hip |
| Psoas major | flexion at hip and/or lumbar intervertebral joints |
| Biceps femoris | ischial tuberosity & linea aspera to head of fibula and later condyle tibia |
| Biceps femoris | flexion at knee; extension & lateral rotation at hip |
| Semimembranosus | ischial tuberosity to posterior surface medial condyle of tibia |
| Semimembranosus | flexion at knee; extension & medial rotation at hip |
| Semitendinosus | ischial tuberosity to proximal medial surface of tibia |
| Rectus femoris | iliac spine & superior acetabular rim of ilium to tibial tuberosity |
| Rectus femoris | flexion at hip |
| Vastus intermedius | anterolateral surface of femur & distal linea aspera to tibial tuberosity |
| Vastus intermedius | extension at knee |
| Vastus lateralis | anterior & inferior to greater trochanter & proximal linea aspera to Ti Tub. |
| Vastus medialis | entire length of linea aspera to tibial tuberosity |
| Tibialis anterior | lateral condyle & proximal shaft of tibia to base of 1st metatarsal |
| Tibialis anterior | dorsiflexion; inversion of foot |
| Gastrocnemius | femoral condyles to calcaneous |
| Gastrocnemius | plantar flexion; flexion at knee |
Created by:
jchironna
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