Lab 3

Question 1

Platysma 
Origin: \_\_\_\_
of anterolat neck
Insertion: \_\_\_\_ and labial
Innervation: CN \_\_\_\_ – cervical branch
Action: tenses \_\_\_\_ of ant-lat neck, weak \_\_\_\_

Answer 1

superficial fascia
mandible
VII
fascia
depressor

Question 2

Frontalis Origin: ____
Insertion: ____ and fascia frontal region and eyebrow
Innervation: CN ____ – ____ branch
Action: elevates ____ and skin at nasal root, wrinkles f____

Answer 2

epicranial aponeurosis
VII
temporal
brows
forehead

Question 3

Orbicularis Oculi
Origin: multiple
Insertion: multiple
Innervation: CN ____ – ____ branches
Action:
- ____: depresses upper lid, elevates lower lid
- ____: draws eyelids and lacrimal papillae medially – secretion assisting
- ____: closes and slightly medial of eye

Answer 3

VII
temporal, zygomatic and buccal
palpebral
lacrimal
ocular

Question 4

Zygomaticus Major
Origin: \_\_\_\_
Insertion: \_\_\_\_ lateral angle of mouth, dermis and submucosa of angle
Innervation: CN \_\_\_\_ – \_\_\_\_ branches
Action: draws mouth \_\_\_\_ and \_\_\_\_

Answer 4

zygomatic arch
modiolus
VII
zygomatic
buccal
up
lateral

Question 5

Orbicularis Oris
Origin: encircles the mouth - modiolus
Insertion: blends with tons of muscles
Innervation: CN \_\_\_\_ – \_\_\_\_ branches
Action: draws lips \_\_\_\_ and \_\_\_\_ lips

Answer 5

VII
zygomatic
buccal
M?
together
purses

Question 6

Nasalis
Origin: \_\_\_\_ of
maxilla
Insertion: \_\_\_\_ on nasal cartilage
Innervation: CN \_\_\_\_ – superior \_\_\_\_ branches
Action: \_\_\_\_ nasal aperture

Answer 6

canine eminence
aponeurosis
VII
zygomatic and buccal
compresses

Question 7

Levator Labii Superioris
Origin: lower rim of ____ Insertion: dermis of lateral
half of ____
Innervation: CN ____ – ____ branches
Action: raises and everts ____ lip; modifies ____

Answer 7

orbit
upper lip
VII
zygomatic
buccal
upper
nasolabial furrow

Question 8

Levator Anguli Oris
Origin: \_\_\_\_ 
Insertion: lateral angle of
\_\_\_\_
Innervation: CN \_\_\_\_ – \_\_\_\_ branches
Action: raises \_\_\_\_ angle, deepens \_\_\_\_ folds

Answer 8

canine fossa
mouth
VII
zygomatic and buccal
mouth
nasolabial

Question 9

Depressor Labii Inferioris
Origin: oblique line of \_\_\_\_ 
Insertion: dermis and mucosa \_\_\_\_ 
Innervation: CN \_\_\_\_  – \_\_\_\_  branches
Action: draws \_\_\_\_  lip down and slightly lateral

Answer 9

mylohyoid
lower lip
VII
M and buccal
lower

Question 10

Depressor Anguli Oris
Origin: \_\_\_\_ – oblique mandible
Insertion: modiolus; blends with orb. Oris and risorius
Innervation: CN \_\_\_\_ – \_\_\_\_ branches
Action: \_\_\_\_, deepens mentolabial sulcus

Answer 10

mental tubercle
VII
MM and lower B
frown

Question 11

Risorius

Origin: fascia over ____ and ____ gland
Insertion: skin and mucosa at ____ of mouth
Innervation: CN ____ – ____ branches
Action: weak ____ of mouth angle

Answer 11

masseter
parotid
angle
VII
zygomatic and buccal
elevator

Question 12

Greater Auricular nerve
This nerve provides pain/sensory input to the skin overlying the angle of the mandible
**IMPORTANT SIGN OF ____ IN ____

Answer 12

heart attack

women

Question 13

Posterior Cervical
Triangle
Borders:
1. Anterior of \_\_\_\_ 
2. \_\_\_\_
3. Posterior of \_\_\_\_ 

Further divided

• ____ triangle
• CN ____ crosses
• Contains ____, splenius capitius and levator scapulae
• ____ triangle
• Take pulse here
• inferior belly omohyoid*

Answer 13

trapezius
clavicle
SCM

occipital
XI
scalenes

subclavian

Question 14

Why might attempts to anesthetize cervical skin produce an ipsilateral shoulder drop

• The ____ nerve runs in close proximity to the cutaneous branches of cervical plexus at ____. This may eliminate CN XI function in the trapezius causing the drop of the shoulder

Answer 14

spinal accessory

Erb’s point