Muscles: Neck (Ben)

Question 1

Answer 1

mylohyoid

• oral diaphragm… floor of oral cavity

COURSE:

• mylohyoid line of mandible > body of hyoid

ACTION:

• raises oral cavity floor
• elevates hyoid
• elevates tongue
• depresses mandible

INNERVATION:

• mylohyoid branch of mandibular nerve

Question 2

Answer 2

Geniohyoid

COURSE:

• inferior mental spine of mandible > hyoid bone

ACTION:

• carry hyoid bone and tongue up during swallowing

INNERVATION:

• deep cervical ansa

Question 3

Identify both parts.

Answer 3

Digastric Muscle

Anterior Belly:

• digastric fossae > intermediate tendon on hyoid
• elevates hyoid or opens mouth if hyoid held in place by infrahyoids
• inn. by myloid branch of mandibular

Posterior Belly:

• mastoid process of temporal > int. tendon on hyoid
• inn. by facial nerve (CN VII)

Question 4

Answer 4

Stylohyoid

COURSE:

• styloid process of temporal > greater horn of hyoid

ACTION:

• elevate hyoid during swallowing

INNERVATION:

• facial nerve (CN VII)

Question 5

Identify the numbered items.

What is this group of muscles known as?

Answer 5

​Suprahyoid Muscles

1. hyoid bone
2. mylohoid (oral diaphragm, middle layer)
3. geniohyoid (deepest)
4. digastric (anterior belly, most superficial layer)
5. stylohyoid (most superficial layer)
6. digastric (posterior belly, most superficial layer)

Question 6

What is this muscle group called?

Identify all numbered items.

Answer 6

Infrahyoids

1. thyroid cartilage (of larnyx)
2. thyroid gland
3. thyrohyoid
4. omohyoid (superior belly)
5. omohyoid (inferior belly)
6. sternothyroid
7. sternohyoid
8. sternum (manubrium)
9. oblique line (where thyrohyoid & sternothyroid meet)
10. intermediate tendon btwn omohyoid bellies

Question 7

Answer 7

thyrohyoid

COURSE:

• thyroid cartilage > hyoid bone

ACTION:

• elevates thyroid and depresses hyoid

Question 8

Identify both parts.

Answer 8

Omohyoid

- two bellies: superior and inferior

COURSE:

• superior transverse scapular ligament > hyoid bone

ACTION:

• depresses larynx and hyoid
• carries hyoid backward and to the side

Question 9

What nerve innervates all the infrahyoids?

Answer 9

deep cervical ansa

Question 10

Answer 10

Sternothyroid

COURSE:

• manubrium > thyroid cartilage

ACTION:

• depresses thyroid cartilage

Question 11

Answer 11

Sternohyoid

COURSE:

• manubrium > hyoid

ACTION:

• depresses hyoid

Question 12

What is 1?

What does it contain?

Answer 12

Submandibular Triangle

• contains submandibular gland and facial artery

Question 13

What is 2?

What does it contain?

Answer 13

submental triangle

• contains lymph nodes

Question 14

What is 3?

What covers it?

What does it contain?

Answer 14

Carotid Triangle

• covered by carotid sheath
• contains common, external (medial) and internal (lateral) carotid artery

as well as internal jugular vein

Question 15

What is 4?

What does it contain?

Answer 15

omoclavicular triangle

• contains the brachial plexus and sublclavian artery

Question 16

What is 5?

What does it contain?

Answer 16

Omotrapezoid Triangle

• cervical plexus

Question 17

What is 6?

What does it contain?

Answer 17

Medial Cervical Region

• contains infrahyoids, larynx, thyroid

Question 18

What are 7 through 11?

Answer 18

7. mastoid process
8. anterior belly, digastric
9. posterior belly, digastric
10. sternal head, sternocleidomastoid
11. clavicular head, sternocleidomastoid

Question 19

What are 12 through 14?

Answer 19

12. superior belly, omohyoid
13. inferior belly, omohyoid
14. trapezius

Question 20

What are 15 and 17?

Answer 20

15. facial artery
16. submandibular gland

Question 21

What is 16?

Answer 21

lesser supraclavicular fossa

• between the 2 heads of the sternocleidomastoid

Question 22

What function does the tendinous part of the omohyoid play and how?

Answer 22

it keeps the internal jugular vein lumen open by connecting to the carotid sheath covering the carotid triangle