Muscle Actions

Question 1

This muscle elevates the eyebrows and wrinkles the forehead horizontally.

Answer 1

Frontalis

Question 2

This muscle pulls the scalp posteriorly.

Answer 2

Occcipitalis

Question 3

This muscle closes and pulls the skin around the eye.

Answer 3

Orbicularis Oculi

Question 4

These muscles are used to smile.

Answer 4

Zygomaticus Major and Minor

Question 5

This muscle pulls mouth laterally to form a smirk or closed-mouth smile.

Answer 5

Risorius

Question 6

This muscle closes and purses the lips.

Answer 6

Orbicularis Oris

Question 7

This muscle protrudes the lower lip and chin for drinking.

Answer 7

Mentalis

Question 8

This muscle pulls the cheeks in, producing sucking movement, and is used to whistle.

Answer 8

Buccinator

Question 9

These muscles elevate the mandible and are used for chewing.

Answer 9

Masseter and Temporalis

Question 10

This muscle depressed the lower lip and mandible to open the mouth (jaw-dropping).

Answer 10

Platysma

Question 11

This muscle flexes and rotates the head.

Answer 11

Sternocleidomastoid

Question 12

This muscle depresses the mandible and is the fixator for the hyoid during swallowing. It also has two bellies.

Answer 12

Digastric

Question 13

These two muscles elevate the hyoid bone and push food toward pharynx during swallowing.

Answer 13

Mylohyoid and Stylohyoid

Question 14

These two muscles depress the hyoid bone.

Answer 14

Sternohyoid and Omohyoid

Question 15

This muscle flexes, adducts, and medically rotates the arm.

Answer 15

Pectoralis Major

Question 16

This muscle protracts and depresses the scapula.

Answer 16

Pectoralis Minor

Question 17

This muscle is used primarily to abduct the arm.

Answer 17

Deltoid

Question 18

This muscle is used primarily for inspiration (increases volume of thoracic cavity).

Answer 18

Diaphragm

Question 19

These 11 pairs of muscles elevate the rib cage and assist in inspiration.

Answer 19

External Intercostals

Question 20

These 11 pairs of muscles depress the rib cage and assist in expiration.

Answer 20

Internal Intercostals

Question 21

This muscle flexes the trunk and compresses the abdominal cavity (used for sitting up).

Answer 21

Rectus Abdominus

Question 22

These muscles laterally flex the trunk and compress the abdominal cavity.

Answer 22

External and Internal Obliques

Question 23

This muscle’s only job is to compress the abdominal cavity.

Answer 23

Transversus Abdominus (deep to obliques)

Question 24

This large, triangular muscle has three sections, all with different origins and insertions, and four actions: retract, depress, elevate, and superiorly rotate the scapula.

Answer 24

Trapezius

Question 25

These 2 muscles adduct, extend, and medially rotate the arm.

Answer 25

Latissimus Doris and Teres Major

Question 26

These 2 muscles laterally rotate the humerus and stabilize the shoulder joint.

Answer 26

Infraspinatus and Teres Minor

Question 27

This muscles elevates the scapula.

Answer 27

Lavator Scapulae

Question 28

These 2 muscles retract the scapula.

Answer 28

Rhomboid Major and Minor

Question 29

This muscle supinates the forearm.

Answer 29

Biceps Brachii

Question 30

This muscle is the agonist for forearm flexion and elbow flexion.

Answer 30

Brachialis

Question 31

This muscle is the synergistic for forearm flexion, particularly useful when walking upstairs.

Answer 31

Brachioradialis

Question 32

This muscle extends the forearm.

Answer 32

Triceps Brachii

Question 33

This muscle pronates the forearm.

Answer 33

Pronation Teres

Question 34

This muscle supinates the forearm.

Answer 34

Supinator

Question 35

These muscles flex the hand toward the anterior forearm.

Answer 35

Flexor Carpi Radialis, Palmaris Longus, and Flexor Carpi Ulnaris

Question 36

These muscles extend and adduct the hand.

Answer 36

Extensor Carpi Radialis Longus and Brevis

Question 37

This muscle extends and laterally rotates the thigh.

Answer 37

Gluteus Maximus

Question 38

These two muscles are primarily used for walking.

Answer 38

Gluteus Medius and Gluteus Minimus

Question 39

This muscles Abducts and medially rotates the thigh.

Answer 39

Gluteus Medius

Question 40

This muscle is on the inner thigh and medially rotates the thigh.

Answer 40

Tensor Fasciae Latae

Question 41

This muscle has 4 actions: flexion, abduction, and lateral rotation of the thigh, and flexion of the leg.

Answer 41

Sartorius

Question 42

These 4 muscles make up the quadriceps group, and work to extend the leg.

Answer 42

Rectus Femoris, Vastus Medialis, Vastus Intermediate, and Vastus Lateralis

Question 43

These two muscles stabilize the patella.

Answer 43

Vastus Lateralis and Medialis

Question 44

These three muscles make up the hamstring group, and work to extend the thigh and flex the leg.

Answer 44

Biceps Femoris, Semitendinosus, and Semimembranosus

Question 45

These muscles are used to dorsiflex the foot.

Answer 45

Tibialis Anterior and Extensor Digitorum Longus

Question 46

These two muscles plantarflex the foot at the ankle when climbing stairs.

Answer 46

Gastrocnemius and Soleus

Question 47

These two muscles work to evert (turn outward) the foot.

Answer 47

Fibularis Longus and Brevis

Question 48

This muscle is used to curl the toes.

Answer 48

Flexor Digitorum Longus

Question 49

This muscle is used to extend the index finger.

Answer 49

Extensor Indicis

Question 50

This muscle is used to extend the big toe.

Answer 50

Flexor Hallucis