Muscles: Neck (Ben) Flashcards Preview

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Flashcards in Muscles: Neck (Ben) Deck (22)
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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

2

Geniohyoid

COURSE:

- inferior mental spine of mandible > hyoid bone

ACTION:

- carry hyoid bone and tongue up during swallowing

INNERVATION:

- deep cervical ansa

3

Identify both parts.

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)

4

Stylohyoid

COURSE:

- styloid process of temporal > greater horn of hyoid

ACTION:

- elevate hyoid during swallowing

INNERVATION:

- facial nerve (CN VII)

5

Identify the numbered items.

What is this group of muscles known as?

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)

6

What is this muscle group called?

Identify all numbered items.

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

7

thyrohyoid

COURSE:

- thyroid cartilage > hyoid bone

ACTION:

- elevates thyroid and depresses hyoid

8

Identify both parts.

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

9

What nerve innervates all the infrahyoids?

deep cervical ansa

10

Sternothyroid

COURSE:

- manubrium > thyroid cartilage

ACTION:

- depresses thyroid cartilage

11

Sternohyoid

COURSE:

- manubrium > hyoid

ACTION:

- depresses hyoid

12

What is 1?

What does it contain?

Submandibular Triangle

- contains submandibular gland and facial artery

13

What is 2?

What does it contain?

submental triangle

- contains lymph nodes

14

What is 3?

What covers it?

What does it contain?

Carotid Triangle

- covered by carotid sheath

- contains common, external (medial) and internal (lateral) carotid artery

as well as internal jugular vein

15

What is 4?

What does it contain?

 omoclavicular triangle

- contains the brachial plexus and sublclavian artery

16

What is 5?

What does it contain?

Omotrapezoid Triangle

- cervical plexus

17

What is 6?

What does it contain?

Medial Cervical Region

- contains infrahyoids, larynx, thyroid

18

What are 7 through 11?

7. mastoid process

8. anterior belly, digastric

9. posterior belly, digastric

10. sternal head, sternocleidomastoid

11. clavicular head, sternocleidomastoid

 

19

What are 12 through 14?

12. superior belly, omohyoid

13. inferior belly, omohyoid

14. trapezius

20

What are 15 and 17?

15. facial artery

17. submandibular gland

21

What is 16?

lesser supraclavicular fossa

- between the 2 heads of the sternocleidomastoid

22

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

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