OINA's 1 - Table 5.2 - Muscles of Post. Triangle

Question 1

Platsyma - Origin

Answer 1

Superficial fascia of deltoid and pectoral regions

Question 2

Platysma - Insertion

Answer 2

Inferior border of mandible, some fibers sweep upward and blend with risorius

Question 3

Platysma - Action

Answer 3

Stretches tight the skin of the neck, depresses mandible

Question 4

Platysma - Innervation

Answer 4

Facial nerve (VII) - cervical branch

Question 5

Sternocleidomastoid - Origin

Answer 5

Manubrium and clavicle

Question 6

Sternocleidomastoid - Insertion

Answer 6

Mastoid process and superior nuchal line

Question 7

Sternocleidomastoid - Action

Answer 7

Bilateral: flexes neck
Individually: draws head to shoulder, turns face to opposite side

Question 8

Sternocleidomastoid - nerve

Answer 8

Spinal accessory nerve, APR of C2 and C3

Question 9

Trapezius - origin

Answer 9

Spines of all thoracic and cervical vertebrae
Ligamentum nuchae
Inion
Superior nuchal line

Question 10

Trapezius - insertion

Answer 10

Spine and acromion of scapula

Clavicle

Question 11

Trapezius - action

Answer 11

Head

• Bilateral: extends head
• Individually: Flexes head to same side

Limb girdle
- Rotates and adducts scapula, elevates scapula and clavicle

Question 12

Trapezius - nerve

Answer 12

Spinal accessory APR of C3 and C4

Question 13

Splenius capitis - origin

Answer 13

Ligamentum nuchae

Cervical spines

Question 14

Splenius capitis - insertion

Answer 14

Mastoid process

Superior nuchal line

Question 15

Splenius capitis - action

Answer 15

Bilateral: extends head
Individualy: flexes head laterally, rotates head to ipsilateral side

Question 16

Splenius capitis - nerve

Answer 16

Segmented PPR of cervical spinal nerves

Question 17

Levator scapulae - origin

Answer 17

Transverse processes of cervical vertebrae

Question 18

Levator scapulae - insertion

Answer 18

Scapula

Question 19

Levator scapulae - action

Answer 19

Elevates and rotates scapula

Question 20

Levator scapulae - nerve

Answer 20

Dorsal scapular nerve

Question 21

Scalenus posterior - origin

Answer 21

Transverse processes of cervical vertebrae

Question 22

Scalenus posterior - insertion

Answer 22

Second rib

Question 23

Scalenus posterior - action

Answer 23

Bilateral: flexes neck
Individually: flexes neck laterally

Question 24

Scalenus posterior - nerve

Answer 24

APR of C5 to C8

Question 25

Scalenus medius - origin

Answer 25

Transverse processes of cervical vertebrae

Question 26

Scalenus medius - insertion

Answer 26

First rib

Question 27

Scalenus medius - action

Answer 27

Bilateral: flexes neck
Individually: flexes neck laterally

Question 28

Scalenus medius - nerve

Answer 28

APR of C3 and C4

Question 29

Scalenus anterior - origin

Answer 29

Transverse processes of cervical vertebrae

Question 30

Scalenus anterior - insertion

Answer 30

First rib

Question 31

Scalenus anterior - action

Answer 31

Bilateral: flexes neck
Individually: flexes neck laterally

Question 32

Scalenus anterior - nerve

Answer 32

APR of C5 to C8

Question 33

This one is for Casey Gooch. (Flip for message)

Answer 33

Wake up, Casey! You still have more OINA’s to learn.

You don’t have time to sleep - you’re taking anatomy.

 - Diewitt