New Ax Muscles

Question 1

What are 4 other muscles innervated by CN V3

Answer 1

Mylohyoid

Tensor tympani

Tensor veli palatini

Anterior digastric

Question 2

Sternocleidomastoid

O and I

Answer 2

• O: Manubrium and clavicle
• I: Mastoid region of the skull

Question 3

Sternocleidomastoid action

Nerves

Answer 3

Bilateral, flex neck

Unilateral, rotation

Face turns to contralateral side

Head tilts ipsilateral side

N: CN XI and C2-3

Question 4

Oblique Cervical Muscles

Answer 4

Anterior Scalene

Middle Scalene

Posterior Scalene

Question 5

Scalenes

Attach

Action

Innervates

Answer 5

Attach: TP of C2-C7 and first 2 ribs

Action: Elevate ribs or flex neck

Innervated: by C4-C6

Question 6

Scalene, structures associated

Answer 6

Subclavian artery and brachial plexus pass between the anterior and middle scalene

Subclavian vein and phrenic nerve pass anteriorly to the anterior scalene

Question 7

Suprahyoid Muscles

Answer 7

Digastric

Stylohyoid

Mylohyoid

Geniohyoid

Question 8

Digastric

Anterior and posterior

Answer 8

• Anterior belly
  
  • Origin
    
    • Mandible
  • Insertion
    
    • Hyoid
• Posterior
  
  • Origin
    
    • Mastoid Notch
  • Insertion
    
    • Hyoid

Question 9

Digastric Action

Answer 9

Elevate hyoid

Depresses/Retracts mandible during swallowing

Question 10

Digastric Innervation

Answer 10

Anterior: CN V3 (Mylohyoid branch)

Posterior: CN VII (Digastric branch)

Question 11

Stylohyoid

O

I

N

A

Answer 11

Origin: Styloid process

Inserion: Hyoid

N:CN VII

A: Elvate hyoid during swallowing

Question 12

Mylohyoid

O

I

N

A

Answer 12

O: Mylohyoid line of mandible

I: Hyoid via fibrous raphe

N: CN V3 (Mylohyoid branch)

A: Tightens and elevates oral floor

Depresses, retracts, side to side mandible

Question 13

Geniohyoid

O

I

N

A

Answer 13

O: Inferior mental spines (genial tubercle)

I: Hyoid

N: C1 via CN XII

A: draws hyoid forward

depresses/retracts mandible

Question 14

What makes up the floor of the oral cavity

Answer 14

• Mylohyoid muscles
  
  • Muscular diaphragm
• Geniohyoid muscles
  
  • cord like muscles
  • Superior to mylohyoid
• Tongue
  
  • Superior to geniohyoid

Question 15

Which hyoid muscles are originating from mandible

Answer 15

Digastric Ant

Mylohyoid via mylohyoid bone

Question 16

Which hyoid muscles dont insert on the hyoid

Answer 16

Sternothyroid

Question 17

Which hyoid muscles depress the hyoid

Answer 17

Omohyoid

Sternohyoid

Thyrohyoid

Question 18

Which hyoid muscles are innervated by VII

Answer 18

Posterior digastric

Stylohyoid

Question 19

Which muscles are innervated by ansa cervicalis

Answer 19

Omohyoid

Sternohyoid

Sternothyroid

Question 20

Omohyoid

O

I

A

N

Answer 20

• O: Superior border of scapula
• I: Hyoid
• A: Depresses hyoid
• N Ansa Cervicalis

Question 21

Sternohyoid

O
I
A
N

Answer 21

• O: Manubrium of sternum
• I: Hyoid
• A: Depresse hyoid
• N:Ansa Cervicalis

Question 22

Sternothyroid

O
I
A
N

Answer 22

• O:Manubrium
• I: Thyroid cartilage
• A: Depresses thyroid cartilage
• N: Ansa cervicalis

Question 23

Thyrohyoid

O
I
A
N

Answer 23

• O:Thyroid
• I: Hyoid
• A: Depresses hyoid
• N: C1 via CN XII