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muscle origins, etc
origin, insertion, action
| muscle | origin | insertion | action |
|---|---|---|---|
| zygomaticus major | zygomatic bone | skin at corners of mouth | smiling |
| buccinator | mandible | orbicularis oris | compresses cheeks |
| masseter | zygomatic arch | mandible | elevates mandible |
| platysma | pectoralis major | mandible | depresses mandible |
| sternocleidmastoid | sternum | mastoid process | bows head |
| external intercostals | inferior border of rib above | superior border of rib below | inspiration |
| internal intercostals | superior border of rib below | inferior border of rib above | expiration |
| diaphragm | sternum | central tendon | inspiration |
| pectoralis major | clavicle | humerus | adducts arm |
| serratus anterior | outer surface of ribs 1-8 | scapula | rotates scapula forward |
| trapezius | scapula | occipital bone | shrugs shoulders |
| latissimus dorsi | last 4 ribs | humerus | adducts arms |
| external oblique | last 8 ribs | linea alba | compresses abdominal contents |
| internal oblique | iliac crest | last 3 or 4 ribs | compresses abdominal contents |
| transversus abdominis | iliac crest | xiphoid process | compresses abdominal contents |
| rectus abdominis | pubic crest | xiphoid process | compresses abdominal contents |
| deltoid | clavicle | humerus | abducts arm |
| biceps brachii | LH: above scapula | humerus | supinates arm |
| triceps brachii | LoH: scapula | ulna | extends forearm |
| flexor digitorum superficialis | radius | phalanges 2-5 | flexes fingers |
| flexor carpi radialis | humerus | metacarpals 1-2 | flexes wrist |
| flexor carpi ulnaris | humerus | 5th metacarpal | flexes wrist |
| extensor carpi radialis | humerus | metacarpals 2-3 | extends wrist |
| extensor carpi ulnaris | humerus | 5th metacarpal | adducts little finger |
| extensor digitorum | humerus | metacarpals 2-5 | extends wrist |
| gluteus maximus | coccyx | femur | extends thigh |
| gracilis | pubis | tibia | adducts thigh |
| tensor fascia latae | iliac crest | tibia | abducts thigh |
| soleus | tibia | calcaneus | plantar flexion |
| gastrocnemius | knee capsule | calcaneus | plantar flexion |
| sartorius | iliac spine | tibia | flexes thigh |
| biceps femoris | LH: ischial tuberosity | tibia | flexes leg |
| semitendinosus | ischial tuberosity | tibia | flexes leg |
| semimembranosus | ischial tuberosity | tibia | flexes leg |
| rectus femorus | iliac spine | tibial tuberosity | flexes leg |
| vastus latralis | femur | tibial tuberosity | flexes leg |
| vastus medialis | femur | tibial tuberosity | flexes leg |
| vastus intermedius | femur | ischial tuberosity | flexes leg |
| tibialis anterior | tibia | metatarsal 1 | dorsiflexion |
| extensor digitorum longus | tibia | phalanges 2-5 | dorsiflexion |
| fibularis [peroneus] longus | fibula | metatarsal 1 | plantar flexion |
| orbicularis oculi | frontal bone | eyelids | blinking |
| orbicularis oris | mandible | skin at corners of mouth | puckers lips |