| A | B |
|---|
| origin | fixed end of a muscle |
| insertion | movable end of a muscle |
| antagonists | muscles opposing each other in action |
| orbicularis oris | closes and puckers the lips |
| zygomaticus | smiling muscle; pulls angle of lips upward |
| temporalis | helps masseter raise the mandible |
| buccinator | compresses cheeks |
| sternocleidomastoid | pair of neck muscles that flex head |
| splenius capitus | pair of neck muscles that extend head |
| transversus abdominis | innermost muscle of abdominal wall |
| external intercostals | raises ribs during inspiration |
| trapezius | elevates (raises) clavicle and scapula |
| serratus anterior | draws scapula downward and anteriorly |
| pectoralis major | adducts and draws humerus across chest |
| latissimus dorsi | sheetlike muscle of lower back; adducts and extends humerus |
| deltoid | abducts, flexes, and extends humerus |
| teres major | assists latissumus dorsi |
| brachialis | assists biceps brachii in flexing and rotating forearm laterally |
| brachioradialis | assists biceps brachii in flexing and rotating forearm laterally |
| triceps brachii | extends forearm |
| biceps brachii | flexes and rotates forearm laterally |
| flexor carpi radialis | flexes and abducts wrist |
| flexor carpi ulnaris | flexes and adducts wrist |
| extensor digitorum | extends fingers |
| extensor carpi ulnaris | extends and adducts wrist |
| extensor carpi radialis longus | extends and abducts wrist |
| adductor longus | abducts, flexes, and rotates thigh laterally |
| adductor magnus | abducts, flexes, and rotates thigh laterally |
| gluteus medius | abducts and rotates thigh medially |
| gluteus maximus | extends and rotates thigh laterally |
| tensor fascia latae | flexes and abducts thigh |
| iliacus | flexes thigh only (w/ psoas major) |
| psoas major | flexes thigh onley (w/ iliacus) |
| sartorius | flexes leg and thigh |
| gracilis | fkexes leg and adducts thigh |
| quadriceps femoris | group of four muscles that extend the leg |
| biceps femoris, semitendinosus, semimembranosus | muscles that flex the leg and extend the thigh |
| tibialis anterior | dorsiflexes and inverts the foot |
| gastrocnemius | flexes the leg and plantar flexes the foot |
| extensor digitorum longus | exteds toes and dorsiflexes and everts foot |
| peroneus longus | plantar flexes and everts foot |
