Hyoid Muscles Flashcards Preview

ESA 4 - Head and Neck > Hyoid Muscles > Flashcards

Flashcards in Hyoid Muscles Deck (60):
1

What are the categories of hyoid muscles? 

  • Infrahyoid
  • Suprahyoid

 

2

What are the infrahyoid muscles? 

A group of four muscles that are located inferiorly to the hyoid bone in the neck

3

What can the infrahyoid muscles be divided into? 

Two groups - superficial plane and deep plane 

4

What are the muscles of the superficial plane of infrahyoid muscles? 

  • Omohyoid
  • Sternohyoid

 

 

5

What are the infrahyoid muscles of the deep plane? 

  • Sternothyroid
  • Thyrohyoid 

 

6

What is the arterial supply to the infrahyoid muscles via? 

The superior and inferior thyroid arteries 

7

What is the omohyoid comprised of? 

Two muscle bellies 

8

What connects the muscle bellies of the omohyoid? 

A muscular tendion 

9

What is the origin of the omohyoid muscle? 

Inferior belly arises from scapula 

10

Where does the inferior belly of the omohyoid muscle run? 

Superomedially underneath the sternocleidomastoid, and then attaches to superior belly 

11

How does the inferior belly of the omohyoid attach to the superior belly? 

By an intermediate tendon

12

What is the superior belly of the omohyoid anchored to? 

The clavicle 

13

How is the superior belly of the omohyoid anchored to the clavicle? 

By deep cervical fascia 

14

What happens to the superior belly after it attaches to the inferior belly? 

It ascends to attach to the hyoid bone 

15

What are the actions of the omohyoid? 

Depresses the hyoid bone 

16

What is the innervation of the omohyoid? 

Anterior rami of C1-C3, carried by a branch of the ansa cervicalis

17

What is the origin of the sternohyoid? 

Sternum and sternoclavicular joint 

18

What does the sternohyoid attach? 

Hyoid bone 

19

What is the action of the sternohyoid? 

Depresses hyoid bone 

20

What is the innervation of the sternohyoid? 

Anterior rami of C1-C2, carried by branch of ansa cervicalis 

21

How does the sternothyroid compare to the sternohyoid? 

It is wider and deeper

22

What is the origin of the sternothyroid? 

Manubrium of sternum 

23

What is the attachment of the sternothyroid? 

Thyroid cartilage 

24

What is the action of the sternothyroid? 

Depresses the thyroid cartilage

25

What is the innervation of the sternothyroid? 

Anterior rami of C1-C3, carried by a branch of the ansa cervicalis 

26

What is the thryohyoid? 

A short band of muscle, thought to be a continuation of the sternothyroid muscle 

27

What is the origin of the thyrohyoid? 

Thyroid cartilage of larynx 

28

What is the attachment of the thyrohyoid? 

Hyoid bone 

29

What is the action of the thyrohyoid? 

Depresses the hyoid. If the hyoid bone is fixed, it can elevate the larynx

30

What is the innervation of the thyrohyoid? 

Anterior ramus of C1, carried within the hypoglossal nerve

31

What are the suprahyoid muscles?

A group of four muscles located superiorly to the hyoid bone in the neck

32

What is the action of the suprahyoid muscles?

Elevate the hyoid bone 

33

What is the elevation of the hyoid bone involved in? 

Swallowing

34

What is the arterial supply to the suprahyoid muscles?

Via branches of the facial artery, occipital artery, and ligual artery 

35

What are the names of the suprahyoid muscles?

  • Stylohyoid
  • Digastric
  • Mylohyoid
  • Geniohyoid

 

36

Describe the shape of the stylohyoid?

Thin muscular strip 

37

Where is the stylohyoid muscle located? 

In the posterior belly of the digastric muscle 

38

What is the origin of the stylohyoid muscle?

Styloid process of temporal bone 

39

What is the attachment of the stylohyoid muscle? 

Lateral aspect of hyoid bone 

40

What is the action of the stylohyoid muscle?

Initiates a swallowing action by pulling the hyoid bone in a posterior and superior direction 

41

What is the innervation of the stylohyoid?

The stylohyoid branch of facial nerve (CN VII)

42

Where does the stylohyoid branch of the facial nerve arise? 

Proximally to the parotid gland 

43

What is the digastric comprised of?

Two muscular bellies connected by a tendon 

44

What is the origin of the digastric?

  • Anterior belly from digastric fossa of mandible
  • Posterior belly from mastoid process of temporal bone 

 

45

Where does the intermediate tendon connecting the two bellies of the digastric attach?

To the hyoid bone, via a fibrous sling

46

What are the actions of the digastric? 

Depresses the mandible and elevates hyoid bone 

47

What is the innervation of the anterior belly of the digastric?

Inferior alveolar nerve

48

What is the inferior alveolar nerve a branch of?

The mandibular nerve, which is derived from the trigeminal nerve

49

What is the posterior belly of the digastric innervated by? 

The digastric branch of the facial nerve

50

What shape is the mylohyoid?

Broad, triangular 

51

What does the mylohyoid form?

The floor of the oral cavity

52

What is the origin of the mylohyoid?

Mylohyoid line of mandible

 

53

What is the attachment of the mylohyoid?

Hyoid bone

54

What are the actions of the mylohyoid? 

Elevates the hyoid bone and floor of mouth 

55

What is the innervation of the mylohyoid?

Inferior alveolar nerve

56

Where is the geniohyoid located?

Close to the midline of the neck, deep to the mylohyoid muscle

57

What is the origin of the geniohyoid?

Inferior mental spine of mandible 

58

What is the attachment of the geniohyoid?

Hyoid bone 

59

What is the action of the geniohyoid?

Depresses mandible and elevates hyoid bone

60

What is the innervation of the geniohyoid?

C1 nerve roots that run with the hypoglossal nerve