What are the primary functions of skeletal muscles?
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Study the key muscle groups, their functions, origin-insertion points, and their role in movement and stability.
Mastering this deck enables you to identify major muscle groups, understand their functional roles in movement and posture, and apply this knowledge clinically for diagnoses, rehabilitation, and athletic training optimization.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What are the primary functions of skeletal muscles? | Skeletal muscles facilitate voluntary movements, maintain posture and stability, and generate heat during activity. | Think of movements you control consciously. |
| 2 | Where does the biceps brachii originate and insert? | Originates from the scapula (supraglenoid tubercle and coracoid process); inserts on the radial tuberosity. | Think of the arm flexor muscle involved in curling. |
| 3 | Name the major muscle group responsible for hip extension and its primary action. | The gluteus maximus; it extends and externally rotates the hip, aiding in standing up from a seated position and climbing stairs. | Think of the buttock muscle involved in powerful movements. |
| 4 | Which muscles make up the quadriceps femoris group, and what is their main function? | The quadriceps include rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius; they extend the knee joint. | Remember 'quads' are key for straightening the knee. |
| 5 | Identify the primary muscles involved in shoulder abduction. | The deltoid muscle, especially its middle fibers, abducts the shoulder joint. | Think of lifting your arm sideways. |
| 6 | What is the origin and insertion of the rectus abdominis? | Originates from the pubic symphysis and pubic crest; inserts on the xiphoid process and the costal cartilages of ribs 5-7. | The 'six-pack' muscle. |
| 7 | Which muscle group is primarily responsible for plantar flexion of the foot? | The gastrocnemius and soleus muscles (calf muscles). | Think of pushing off during a jump. |
| 8 | Describe the role of the trapezius muscle. | It elevates, retracts, and rotates the scapula, and extends the neck; important for shoulder movement and posture. | Think of shrugging your shoulders. |
| 9 | What are the main muscles involved in elbow flexion? | Primarily the biceps brachii, assisted by brachialis and brachioradialis. | Muscle you use when doing a bicep curl. |
| 10 | Which muscles are involved in lateral rotation of the shoulder? | Infraspinatus and teres minor muscles. | Think of rotating your arm outward. |
| 11 | What are the key differences between axial and appendicular muscles? | Axial muscles are involved in movements of the head, neck, and trunk; appendicular muscles move the limbs. | Axial = core/trunk; appendicular = limbs. |
| 12 | Name the muscles forming the hamstring group and their primary function. | Biceps femoris, semitendinosus, semimembranosus; they flex the knee and extend the hip. | Muscles at the back of the thigh. |
| 13 | Which muscle is primarily responsible for the dorsiflexion of the foot? | Tibialis anterior. | Muscle on the front of the shin. |
| 14 | Identify the main muscles involved in scapular elevation. | Upper fibers of the trapezius and levator scapulae. | Think of shrugging your shoulders. |
| 15 | What is the function of the iliopsoas muscle? | It is a primary hip flexor, crucial for walking, running, and standing from sitting. | Deep muscle connecting the pelvis and femur. |
| 16 | Which muscles are primarily involved in wrist flexion? | Flexor carpi radialis, flexor carpi ulnaris, and flexor digitorum superficialis. | Muscles on the anterior forearm. |
| 17 | Describe the role of the serratus anterior muscle. | Protracts and stabilizes the scapula, essential for pushing movements. | Think of 'boxer's muscle' for punching. |
| 18 | Which muscles are involved in lateral neck flexion and rotation? | Sternocleidomastoid and scalene muscles. | Muscles on the sides of the neck. |
| 19 | What are the primary movements facilitated by the pectoralis major? | Flexion, adduction, and internal rotation of the humerus. | Muscle involved when doing a push-up. |
| 20 | Identify the origin and insertion of the latissimus dorsi. | Originates from thoracolumbar fascia, iliac crest, and lower ribs; inserts on the intertubercular groove of the humerus. | Muscle used in pull-downs and pull-ups. |
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