Hyoid/Infrahyoid Muslces

Question 1

Describe the location of the hyoid bone.

Answer 1

Located between the mandible and the layranx

Question 2

What is the main function of the hyoid bone?

Answer 2

It serves as the attachment point for several muscles

Question 3

What are the three anatomical sections of the hyoid bone?

Answer 3

1) body
2) Greater horn
3) Lesser Horn

Question 4

Embryologically, what is significant about the hyoid bone?

Answer 4

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

Question 5

What is significant about the hyoid bone?

Answer 5

It does not attach to any other bone

Question 6

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

Answer 6

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

Question 7

What is the primary function of the infrahyoid muscles?

Answer 7

to move the hyoid bone and the larynx

Question 8

What are the four (4) infrahyoid muscles

Answer 8

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

Question 9

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

Answer 9

1) Omohyoid

2) Sternohyoid

Question 10

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

Answer 10

1) Sternothyroid

2) Thyrohyoid

Question 11

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

Answer 11

Omohyoid

Question 12

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

Answer 12

Omohyoid

Question 13

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

Answer 13

Thyrohyoid. It is supplied by C1 through the hypoglossal nerve

Question 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?

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

1) Omohyoid

2) Sternohyoid

Question 17

Which of these muscles act to depress only the larynx?

Answer 17

Sternothyroid

Question 18

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

Answer 18

Thyrohyoid

Question 19

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

Answer 19

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

Question 20

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

Answer 20

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