Hyoid/Infrahyoid Muslces Flashcards Preview

Gross Anatomy II Exam I > Hyoid/Infrahyoid Muslces > Flashcards

Flashcards in Hyoid/Infrahyoid Muslces Deck (20):
1

Describe the location of the hyoid bone.

Located between the mandible and the layranx

2

What is the main function of the hyoid bone?

It serves as the attachment point for several muscles

3

What are the three anatomical sections of the hyoid bone?

1) body
2) Greater horn
3) Lesser Horn

4

Embryologically, what is significant about the hyoid bone?

It is believed to be the remenat of one of the phyrangel aches

5

What is significant about the hyoid bone?

It does not attach to any other bone

6

Which part of the hyoid bone is not always present and what is the function of that area?

The Lesser Horn- It serves as the attachment point for the stylohyoid ligamnet

7

What is the primary function of the infrahyoid muscles?

to move the hyoid bone and the larynx

8

What are the four (4) infrahyoid muscles

1) Omohyoid
2) Sternohyoid
3) Sternothyroid
4) Thyrohyoid

9

Which of the infrahyoid muscles make up the superficial layer of infrahyoid muscles?

1) Omohyoid
2) Sternohyoid

10

What muscles make up the deep layer of the infrahyoid muscles?

1) Sternothyroid
2) Thyrohyoid

11

Which of the infrahyoid muscles is usually held down by some kind of tissue sling?

Omohyoid

12

Which of the infrahyoid muslces is seperated my an intermediate tendon betwen the two bellies of hte musle?

Omohyoid

13

Which of the infrahyoid muscles is not supplied by the ansa cervicalis (C1, C2, C3)?

Thyrohyoid. It is supplied by C1 through the hypoglossal nerve

14

Which of these muscles have origin(s) on the posterior surface of the manubrium and what are the other origin sites for these muscles?

1) Sternohyoid- the medial end of the clavicle
2) Sternothyroid- the origin of this muscle if inferior to that of the sternohyoid on the manubrium

15

Which of these muscles does not have an insertion point on the body of the hyoid bone?

Sternothyroid- it has its insertion point on the oblique line on the lamina of the thyroid cartilage

16

Which of these muscles function to depress both the hyoid bone and the larynx?

1) Omohyoid
2) Sternohyoid

17

Which of these muscles act to depress only the larynx?

Sternothyroid

18

Which of these muscles function to only depress of the hyoid bone?

Thyrohyoid

19

Which of these msucles develop from teh same mass and then are diferentiated by an aattachment point?

The Sternothyroid and Thyrohyoid Muscles- separated by the attachment point on the oblique line of the thyroid cartilige

20

Why do all of these muscle act to depress the hyoid and the larynx?

1) the act of swallowing- to open the space to allow for food to pass
2) Speech functions
3) Respiration/Breathing
4) if the hyoid is fixed, the digastric depresses the mandible therefore changing the action of the muscle