Suprahyoid/Extrinsic Tongue Muscles (MT)

Question 1

Origin and Insertion of Digastric Anterior Belly

Answer 1

Origin:
Digastric Fossa of Mandible

Insertion:
Hyoid Bone via Digastric Tendon

Question 2

Origin and Insertion of Digastric Posterior Belly

Answer 2

Origin:
Medial Aspect of Mastoid Process

Insertion:
Hyoid Bone via Digastric Tendon

Question 3

Origin and Insertion of Mylohyoid

Answer 3

Origin:
Mylohyoid Line of Mandible

Insertion:
Hyoid bone and mylohyoid Raphe

Question 4

Origin and Insertion of Geniohyoid

Answer 4

Origin:
Inferior Mental Spine of Mandible

Insertion:
Hyoid Bone

Question 5

Origin and Insertion of Stylohyoid

Answer 5

Origin:
Styloid Process

Insertion:
Body of the Hyoid Bone

Question 6

Innervation and Action of Digastric anterior belly

Answer 6

Innervation:
Mylohyoid n. (CN V3)

Action:
Lowers Mandible or raises Hyoid

Question 7

Innervation and Action of Digastric posterior belly

Answer 7

Innervation:
CN VII

Action:
Elevates and Retracts Hyoid

Question 8

Innervation and Action of Mylohyoid

Answer 8

Innervation:
Mylohyoid n. (CN V3)

Action:

• Supports and Elevates floor of mouth
• Raises Hyoid

Question 9

Innervation and Action of geniohyoid

Answer 9

Innervation:
C1 branch traveling with CNXII

Action:
Draws mandible and hyoid toward each other

Question 10

Innervation and Action of stylohyoid

Answer 10

Innervation:
CN VII

Action:
Elevates and retracts hyoid

Question 11

Which of the suprahyoid muscles is innervated by CN VII?

- Muscle function?

Answer 11

• Posterior Belly of Digastric
• Stylohyoid

BOTH elevate and retract the hyoid

Question 12

Which of the suprahyoid muscles is innervated by CN V3 (mylohyoid n.)?

Answer 12

• Anterior Belly of Digastric

- Mylohyoid

Question 13

What is the common function of all of the suprahyoid muscles?

Answer 13

• Elevate they hyoid

Question 14

Which muscles act to retract they hyoid?

Answer 14

• Stylohyoid

- Posterior belly of Digastric

Question 15

Origin and Insertion of Hyoglossus

Answer 15

Origin:
Greater horn of the hyoid bone

Insertion:
Lateral Tongue

Question 16

Origin and Insertion of Genioglossus

Answer 16

Origin:
Superior Mental Spine

Insertion:
Hyoid Bone, tongue

Question 17

Origin and Insertion of styloglossus

Answer 17

Origin:
Styloid Process

Insertion:
Lateral Tongue

Question 18

Origin and Insertion of Palatoglssus

Answer 18

Origin:

• Posterior Margin of the hard Palate
• Palatine Aponeurosis

Insertion:
Lateral Tongue

Question 19

Innervation and Action of Hyoglossus

Answer 19

Innervation:
CN XII

Action:
Depress and Retract Tongue

Question 20

Innervation and Action of Genioglossus

Answer 20

Innervation:
CN XII

Action:

• Protrudes
• Depresses
• Retacts tongue

Question 21

Innervation and Action of Styloglossus

Answer 21

Innervation:
CN XII

Action:

• Retracts
• Elevates tonge

Question 22

Innervation and Action of Palatoglossus

Answer 22

Innervation:
CN X (Pharyngeal Branches)

Action:

• Depresses Palate
• Elevates back of the Tongue

Question 23

What are the 5 suprahyoid muscles?

Answer 23

1. Digastric (anterior)
2. Digastric (Posterior)
3. Mylohyoid
4. Geniohyoid
5. Stylohyoid

Question 24

What are the 4 extrinsic muscles of the tongue?

Answer 24

1. Hyoglossus
2. Genioglossus
3. Styloglossus
4. Palatoglossus

Question 25

What extrinsic tongue muscles are innervated by CN XII?

Answer 25

• Hyoglossus
• Genioglossus
• Styloglossus

Question 26

Which of the Extrinsic tongue muscles act to depress the tongue?

Answer 26

• Hyoglossus
• Genioglossus
• Palatoglossus

Question 27

Which extrinsic muscles of the tongue act to retract the tongue?

Answer 27

• Hyoglossus
• Genioglossus
• Styloglossus

**All innervated by CN XII