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| 1. | abduct | move away from midline in the sagittal plane |
| 2. | abductor digiti minimi | muscle that abducts the little finger |
| 3. | abductor pollicis brevis | muscle that abducts the thumb |
| 4. | abductor pollicis longus | muscle that inserts into the first metacarpal |
| 5. | abductor | moves the bone away from the midline |
| 6. | adductor brevis | muscle that adducts and medially rotates the thigh |
| 7. | adductor longus | muscle that adducts, medially rotates, and flexes the thigh |
| 8. | adductor magnus | muscle with an anterior fascicle that adducts, medially rotates and flexes the thigh, and a posterior fascicle that assists in thigh extension |
| 9. | adductor pollicis | muscle that adducts the thumb |
| 10. | adductor | moves the bone toward the midline |
| 11. | agonist | (also, prime mover) muscle whose contraction is responsible for producing a particular motion |
| 12. | anal triangle | posterior triangle of the perineum that includes the anus |
| 13. | anconeus | small muscle on the lateral posterior elbow that extends the forearm |
| 14. | antagonist | muscle that opposes the action of an agonist |
| 15. | anterior compartment of the arm | (anterior flexor compartment of the arm) the biceps brachii, brachialis, brachioradialis, and their associated blood vessels and nerves |
| 16. | anterior compartment of the forearm | (anterior flexor compartment of the forearm) deep and superficial muscles that originate on the humerus and insert into the hand |
| 17. | anterior compartment of the leg | region that includes muscles that dorsiflex the foot |
| 18. | anterior compartment of the thigh | region that includes muscles that flex the thigh and extend the leg |
| 19. | anterior scalene | a muscle anterior to the middle scalene |
| 20. | appendicular | of the arms and legs |
| 21. | axial | of the trunk and head |
| 22. | belly | bulky central body of a muscle |
| 23. | biceps brachii | two-headed muscle that crosses the shoulder and elbow joints to flex the forearm while assisting in supinating it and flexing the arm at the shoulder |
| 24. | biceps femoris | hamstring muscle |
| 25. | bipennate | pennate muscle that has fascicles that are located on both sides of the tendon |
| 26. | brachialis | muscle deep to the biceps brachii that provides power in flexing the forearm. |
| 27. | brachioradialis | muscle that can flex the forearm quickly or help lift a load slowly |
| 28. | buccinator | muscle that compresses the cheek |
| 29. | calcaneal tendon | (also, Achilles tendon) strong tendon that inserts into the calcaneal bone of the ankle |
| 30. | caval opening | opening in the diaphragm that allows the inferior vena cava to pass through; foramen for the vena cava |
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