Muscles and insersions-Lab Practical 4

Question 1

Orbicularis oris origin

Answer 1

Maxilla and mandible

Question 2

Orbicularis oris insertion

Answer 2

Lips

Question 3

Orbicularis oris action

Answer 3

Closes and purses lips (“kissing muscle”)

Question 4

Zygomaticus major origin

Answer 4

Zygomatic bone

Question 5

Zygomaticus major insertion

Answer 5

Angle of mouth

Question 6

Zygomaticus major/minor

action

Answer 6

Smiling muscles

Question 7

Zygomaticus minor origin

Answer 7

Zygomatic bone

Question 8

Zygomaticus minor insertion

Answer 8

Upper lip

Question 9

Buccinator origin

Answer 9

Alveolar processes

Question 10

Buccinator insertion

Answer 10

Fibers surrounding the orbicularis oris

Question 11

Buccinator action

Answer 11

Compresses cheek (the “trumpeter’s muscle”)

Question 12

Platysma origin

Answer 12

Superior thorax

Question 13

Platysma insertion

Answer 13

Mandible and skin of cheek

Question 14

Platysma action

Answer 14

Tenses skin of neck and depresses mandible

Question 15

Risorius origin

Answer 15

Fascia around the parotid salivary gland

Question 16

Risorius insertion

Answer 16

Angle of the mouth

Question 17

Risorius action

Answer 17

Draws corners of mouth to the side

Question 18

Corrugator supercilii origin

Answer 18

Frontal bone

Question 19

Corrugator supercilii insertion

Answer 19

Eyebrow

Question 20

Corrugator supercilii action

Answer 20

Wrinkles eyebrows

Question 21

Orbicularis oculi origin

Answer 21

Medial margin of orbit

Question 22

Orbicularis oculi insertion

Answer 22

Skin around the eyelids

Question 23

Orbicularis oculi action

Answer 23

Closes eye

Question 24

Masseter origin

Answer 24

Zygomatic arch

Question 25

Masseter insertion

Answer 25

Mandibular ramus

Question 26

Masseter action

Answer 26

Elevates mandible

Question 27

Temporalis origin

Answer 27

Temporal bone

Question 28

Temporalis insertion

Answer 28

Coronoid process of the mandible

Question 29

Temporalis action

Answer 29

Elevates mandible

Question 30

Sternocleidomastoid origin

Answer 30

Sternum and Clavicle

Question 31

Sternocleidomastoid insertion

Answer 31

Mastoid process

Question 32

Sternocleidomastoid action

Answer 32

1. Together, the produce flexion of the neck | 2. Alone, each flexes head toward shoulder and rotates face to opposite side

Question 33

Semispinalis capitis origin

Answer 33

Transverse processes of lower cervical and upper thoracic vertebrae

Question 34

Semispinalis capitis insertion

Answer 34

Occipital bone between nuchal lines

Question 35

Semispinalis capitis action

Answer 35

Bilateral contraction: extends the head | Unilateral contraction: extends and laterally flexes neck

Question 36

Semispinalis cervicis origin

Answer 36

Transverse processes of T1-T5

Question 37

Semispinalis cervicis insertion

Answer 37

Spinous processes of C2-C5

Question 38

Semispinalis cervicis action

Answer 38

Extends vertebral column and rotates towards the opposite side

Question 39

Semispinalis thoracis origin

Answer 39

Transverse processes of T6-T10

Question 40

Semispinalis thoracis insertion

Answer 40

Spinous processes of C5-T4

Question 41

Semispinalis thoracis action

Answer 41

Extends vertebral column and rotates towards the opposite side

Question 42

External intercostals origin

Answer 42

Inferior border of each rib

Question 43

External intercostals insertion

Answer 43

Superior border of adjacent inferior rib

Question 44

External intercostals action

Answer 44

Elevation of ribs

Question 45

Internal intercostals origin

Answer 45

Superior border of each rib

Question 46

Internal intercostals insertion

Answer 46

Inferior border of adjacent superior rib

Question 47

Internal intercostals action

Answer 47

Depression of ribs

Question 48

Rectus abdominis origin

Answer 48

Superior surface of pubis

Question 49

Rectus abdominis insertion

Answer 49

Xiphoid process and costal cartilage of ribs 5-7

Question 50

Rectus abdominis action

Answer 50

Flexes vertebral column and depresses ribs