Anterior Neck

Question 1

Digastric

Answer 1

Origin:
[Anterior Belly]
-Digastric fossa of mandible

[Posterior Belly]
-Mastoid notch of temporal bone

Insertion:

• Intermediate tendon of body
• Horn of hyoid bone

Action:

• Depresses mandible against resistance
• Elevates/steadies hyoid while speaking/swallowing

Question 2

Mylohyoid

Answer 2

Origin:
-Mylohyoid line of mandible

Insertion:
-Body of hyoid

Action:
-Elevates hyoid/floor of mouth

Question 3

Stylohyoid

Answer 3

Origin:
-Styloid process

Insertion:
-Body of hyoid

Action:

• Elevates/retracts hyoid
• Elongates floor of mouth

Question 4

Geniohyoid

Answer 4

Origin:
-Inferior mental spine of mandible

Insertion:
-Body of hyoid

Action:

• Pulls hyoid anterosuperiorly
• Shortens floor of mouth
• Widens pharynx

Question 5

Sternohyoid

Answer 5

Origin:

• Manubrium of sternum
• Medial clavicle

Insertion:
-Body of hyoid

Action:
-Depresses hyoid after elevation (swallowing)

Question 6

Sternothyroid

Answer 6

Origin:
-Posterior surface of manubrium

Insertion:
-Oblique line of thyroid cartilage

Action:
-Depresses hyoid/larynx

Question 7

Thyrohyoid

Answer 7

Origin:
-Oblique line of thyroid cartilage

Insertion:
-Inferior border of body/greater horn of hyoid

Action:
-Depresses hyoid/elevates larynx

Question 8

Omohyoid

Answer 8

Origin:
-Superior border of scapula near suprascapular notch

Insertion:
-Inferior border of hyoid

Action:
-Depresses/retracts/steadies hyoid

Question 9

Platysma

Answer 9

Origin:

• Inferior border of mandible
• Skin/subQ tissues of lower face

Insertion:
-Fascia covering parts of pectoralis major and deltoid

Action:

• Draws corners of mouth inferiorly
• Widens mouth
• Draws skin of neck superiorly when teeth are clenched