Muscles of Anterior Cervical Region

Question 1

Suprahyoid muscles

Answer 1

• Mylohyoid m.
• Geniohyoid m.
• Stylohyoid m.
• Digastric m.

Question 2

Mylohyoid m. - origin

Answer 2

Mylohyoid line of mandible

Question 3

Mylohyoid m. - insertion

Answer 3

Mylohyoid raphe and body of hyoid

Question 4

Mylohyoid m. - innervation

Answer 4

N. to mylohyoid, branch of inferior alveolar n. (from mandibular n. CN V3)

Question 5

Geniohyoid m. - origin

Answer 5

Inferior mental spine of mandible

Question 6

Geniohyoid m., Stylohyoid m. - insertion

Answer 6

Body of hyoid

Question 7

Geniohyoid m. - innervation

Answer 7

C1 via hypoglossal n. (CN XII)

Question 8

Geniohyoid m. - action

Answer 8

• Pulls hyoid anterosuperiorly
• shortens floor of mouth
• widens pharynx

Question 9

Mylohyoid m. - action

Answer 9

• elevates hyoid, floor of mouth, and tongue during swallowing and speaking

Question 10

Stylohyoid m. - origin

Answer 10

Styloid process of temporal bone

Question 11

Stylohyoid m. - innervation

Answer 11

Stylohyoid branch of facial n. (CN VII)

Question 12

Stylohyoid m. - action

Answer 12

elevates and retracts hyoid, thus elongating floor of mouth

Question 13

Digastric m. - origin

Answer 13

• anterior belly: digastric fossa of mandible

- posterior belly: mastoid notch of temporal bone

Question 14

Digastric m. - insertion

Answer 14

Both bellies - intermediate tendon to body and greater horn of hyoid

Question 15

Digastric m. - innervation

Answer 15

• anterior belly: n. to mylohyoid, branch of inferior alveolar n.
• inferior belly: digastric branch of facial n. (CN VII)

Question 16

Digastric m. - action

Answer 16

• working with infrahyoid m., depresses mandible against resistance
• elevates and steadies hyoid during swallowing and speaking

Question 17

Infrahyoid muscles

Answer 17

• Sternohyoid m.
• Omohyoid m.
• Sternothyroid m.
• Thyrohyoid m.

Question 18

Sternohyoid m. - origin

Answer 18

manubrium of sternum and medial end of clavicle

Question 19

Sternohyoid m. - insertion

Answer 19

body of hyoid

Question 20

Sternohyoid m. - innervation

Answer 20

C1-3 by a branch of ansa cervicalis

Question 21

Sternohyoid m. - action

Answer 21

depresses hyoid after elevation during swallowing

Question 22

Omohyoid m. - origin

Answer 22

superior border of scapula near suprascapular notch

Question 23

Omohyoid m. - insertion

Answer 23

inferior border of hyoid

Question 24

Omohyoid m. - innervation

Answer 24

C1-3 by a branch of ansa cervicalis

Question 25

Omohyoid m. - action

Answer 25

depresses, retracts, and steadies hyoid

Question 26

Sternothyroid m. - origin

Answer 26

posterior surface of manubrium of sternum

Question 27

Sternothyroid m. - insertion

Answer 27

oblique line of thyroid cartilage

Question 28

Sternothyroid m. - innervation

Answer 28

C2-3 by a branch of ansa cervicalis

Question 29

Sternothyroid m. - action

Answer 29

depresses hyoid and larynx

Question 30

Thyrohyoid m. - origin

Answer 30

oblique line of thyroid cartilage

Question 31

Thyrohyoid m. - insertion

Answer 31

inferior border of body and greater horn of hyoid

Question 32

Thyrohyoid m. - innervation

Answer 32

C1 via hypoglossal n. (CN XII)

Question 33

Thyrohyoid m. - action

Answer 33

depresses hyoid and elevates larynx