Muscles

Question 1

Orbicularis Oculi

Answer 1

Origin- frontal and maxillary
Insertion- Eyelid Tissue
Action- blinking and Squinting

Question 2

Orbicularis Oris

Answer 2

Origin- maxilla and Mandible
Insertions- Muscles and skin at angles of mouth
Actions- Close lips, kissing, and whistling

Question 3

Zygomaticus

Answer 3

Origin- Zygomatic Bone
Insertions-muscles and skin at corners of mouth
Action- smiling and laughing

Question 4

Buccunator

Answer 4

Origin-Maxilla and Mandible
Insertions- Orbicularis Oris
Action- compress cheek, sucking

Question 5

Platysma

Answer 5

Origin-Fascia of the chest
Insertions- Mandible and skin/ muscle of the mouth
Actions- depresses mandible/ tenses skin of neck during shaving

Question 6

Masseter

Answer 6

Origin- zygomatic and maxilla bone
Insertions-mandible
Actions-
Closes jaw and elevates mandible

Question 7

Temporalis

Answer 7

Origin-Temporal bone
Insertion- mandible
Actions- closes jaw and elevates/retracts mandible

Question 8

Sternocleidomastoid

Answer 8

Origin- sternum and clavicle
Insertion- Temporal and occipital
Actions- rotate head toward opposite shoulder and neck flexion when both muscles contract

Question 9

Pectoralis Major

Answer 9

Origin- sternum, clavicle, ribs, external oblique muscle
Insertion- humerus
Action- arm flexion and forced inspiration

Question 10

Pectoralis minor

Answer 10

Origin- ribs
Insertions- scapula
Actions- pulls scapula forward and i ferior

Question 11

Serratus anterior

Answer 11

Origin- ribs
Insertions- scapula
Actions- Abduction and raising of arm

Question 12

Deltoid

Answer 12

Origins- clavicle and scapula
Insertions- humerus
Actions- abduction of humerus

Question 13

External intercostals

Answer 13

Origins- inferior border of ribs
Insertions- superior border of ribs
Actions- elevates ribs and aids in inspiration

Question 14

Internal intercostals

Answer 14

Origin- superior border of ribs
Insertions- inferior border of ribs
Actions-lowers ribs, aids in forced expiration

Question 15

External Oblique

Answer 15

Origin- ribs
Insertions-linea alba, pubic crest, ilium
Actions- flexes and rotates vertebral column

Question 16

Rectus abdominus

Answer 16

Origins- pubic bone
Insertions- sternum-xiphoid proves and ribs
Action- flexes and rotates vertebral column

Question 17

Latissimus Dorsi

Answer 17

Origin- thoracic and lumbar vertebrae, ribs and ilium
Insertion- humerus
Action- arm extension adduction and medial rotation of arm

Question 18

Trapezius

Answer 18

Origin- occipital bone, cervical and thoracic vertebrae
Insertions- scapula and clavicle
Actions- extends head, shrugs shoulders

Question 19

Coracobrachialis

Answer 19

Origin- scapula
Insertions- humerus
Actions- flexes and adducts humerus

Question 20

Biceps Brachii

Answer 20

Origin- scapula
Insertions- radius- radial tuberosity
Actions- flexes elbow joint, antagonist of forearm extension

Question 21

Brachialis

Answer 21

Origin-humerus
Insertions-ulna
Actions- flexes elbow joint

Question 22

Brachioradialis

Answer 22

Origin- humerus
Insertion- radius- styloid process
Actions- flexes elbow joint

Question 23

Triceps brachii

Answer 23

Origin- scapula and humerus
Insertions- ulna- olecranon process
Actions- extension at elbow joint, antagonist of forearm flexion

Question 24

Supinator

Answer 24

Origin- humerus and ulna
Insertions- radius
Actions- supinate the foearm

Question 25

Pronator teres

Answer 25

Origin- humerus and ulna Insertions- radius Actions- pronates the forearm

Question 26

Sartorius

Answer 26

Origin- ilium- iliac spine Insertion- tibia Action- flex, abduct and laterally rotate thigh. Helps with cross-legged position

Question 27

Rectus femoris

Answer 27

Origin- Ilium-iliac spine and acetabulum Insertion- patella and tibia- tibial tuberosity Action- extends knee and flexes thigh at the hip

Question 28

Vastus lateralis

Answer 28

Origin- femur Insertion- patella and tibia- tibial tuberosity Action- extends knee

Question 29

Vastus medialis

Answer 29

Origin- femur Insertion- patella and tibia- tibial tuberosity Action- extends knee

Question 30

Vastus intermedius

Answer 30

Origin- femur Insertion- patella and tibia- tibial tuberosity Action- extends knee

Question 31

Tensor fasciae latae

Answer 31

Origin- ilium-crest and spine Insertion- tibia Actions- flex, abduct and medially rotate thigh

Question 32

Gluteus maximus

Answer 32

Origin- ilium, sacrum, coccyx Insertion- femur Action- extends thigh ( climbing stairs)

Question 33

Gluteus medius

Answer 33

Origin- ilium Insertion- femur - greater trochanter Actions- abducts and medially rotates thigh( important in walking)

Question 34

Bicep femoris

Answer 34

Origin- femur snd ischium Insertion- tibia and fibula Actions- extends thigh and flexes knee

Question 35

Semitendinosus

Answer 35

Origin- ischium- ischial tuberosity Insertion-tibia Action- extends thigh and flexes knee

Question 36

Semimembranosous

Answer 36

Origin- ischium-ischial tuberosity Insertion- femur and tibia Action-extends thigh and flexes knee

Question 37

Tibialis anterior

Answer 37

Origin- tibia Insertion- tarsal and metatarsal Action- dorsiflexion

Question 38

Gastrocnemius

Answer 38

Origin-femur Insertion- calcaneus Action- plantar flexion

Question 39

Soleus

Answer 39

Origin- tibia and fibula Insertion- calcaneus Action- plantar flexion