Muscles- Actions, Origins, Insertion

Question 1

Buccinator

Answer 1

Action: compresses cheeks

Question 2

Depressor labii inferioris

Answer 2

Action: depresses lip

Question 3

Frontalis

Answer 3

Action: raises eyebrows and wrinkles forehead

Question 4

Levator labii superioris

Answer 4

Elevates upper lip

Question 5

Masseter

Answer 5

Elevates mandible

Question 6

Occipitalis

Answer 6

Tenses and retracts scalp

Question 7

Orbicularis oculi

Answer 7

Closes eyes

Question 8

Orbicularis oris

Answer 8

Compress; purse lips

Question 9

Platysma

Answer 9

Tenses skin of neck; depression of mandible

Question 10

Zygomaticus

Answer 10

Retracts and elevates corner of mouth

Question 11

Deltoid

Answer 11

Abduction in arm

Question 12

Erector spinae

Answer 12

Back extension and resist bending at waist

Question 13

External oblique

Answer 13

Flex vertebral column/ rotation at trunk/ bend laterally

Question 14

Intercostal muscle

Answer 14

Elevates and depresses ribcage

Question 15

Internal oblique

Answer 15

Flex vertebral/ rotate at trunk/ bend laterally

Question 16

Latissimus dorsi

Answer 16

Adduction of the humerus/ extension of the humerus

Question 17

Pectoralis major

Answer 17

Action: adduction/ flexion of the arm
Origin: shoulder grille/ upper ribs
Insertion: proximal humerus

Question 18

Rectus abdominis

Answer 18

Flex vertebral column (child birth, sit ups, pooping)

Question 19

Sternocleidomastoid

Answer 19

Action: bowing and rotation of head
Origin: sternum and clavicle
Insertion: mastoid process of the skull

Question 20

Transversus abdominus

Answer 20

Compress abdominal contents

Question 21

Trapezius

Answer 21

Action: extend head/ move scapula/ shoulder rotation
Origin: occipital bone to last thorastic vertebra
Insertion: scapula and clavicle

Question 22

Triceps brachii

Answer 22

Action: agonist for extension of forearm
Origin: three heads attach to shoulder girdle
Insertion: olecranon process of ulna

Question 23

Biceps brachii

Answer 23

Action: agonist for flexion of the forearm

Question 24

Brachialis and Brachioradialis

Answer 24

Flexion and elbow

Question 25

Flexor carpi radialis and Flexor carpi ulnaris and Palmaris longus

Answer 25

Flexion at wrist

Question 26

Flexor digitorum

Answer 26

Flexion at wrist and fingers

Question 27

Externsor digitorum

Answer 27

Extension of wrist and fingers

Question 28

Extensor carpi ulnaris

Answer 28

Extension of wrist

Question 29

Pronator teres

Answer 29

Pronation (natural movement of foot)

Question 30

Quadriceps

1. Biceps femoris
2. Semimembranosous
3. Semitendinosous

Answer 30

1. Flexion at knee (extend thigh) lateral hip rotation

2. Medial hip rotation

Question 31

Gluteus Maximus

Answer 31

Major extensor of thigh

Question 32

Gluteus medius and Gluteus minimus

Answer 32

Abducts and medially rotates thigh, steadies pelvis

Question 33

Sartorius

Answer 33

Extends at knee (flex thigh) hip abduction, lateral hip rotation

Question 34

Adductor longus

Answer 34

Adducts, flex, and medially rotates thigh

Question 35

Soleus

Answer 35

Plantar flexes foot (walk, run, dance)

Question 36

Gastrocnemius

Answer 36

Plantar flexes foot when knee is extended

Question 37

Tibialis anterior

Answer 37

Dorsiflexion at ankle

Question 38

Extensor digitorum longus

Answer 38

Extend toe joint (plantar flexion)