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Anatomy: Neck (based on Dave's notes only so far) > Infrahyoid muscles (dave's notes) > Flashcards

Infrahyoid muscles (dave's notes) Flashcards

1
Q

What is the origin of sternohyoid?

A

Superior, lateral, posterior aspect of manubrium

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2
Q

What is the insertion of sternohyoid?

A

Inferior border of hyoid bone

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3
Q

What is the action of sternohyoid?

A

Depresses hyoid bone and hence the larynx

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4
Q

What is the nerve supply to sternohyoid?

A

Ansa cervicalis

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5
Q

What is the origin of omohyoid?

A

Supraclavicular ligament and adjacent scapula

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6
Q

What is the insertion of omohyoid?

A

Inferior fodder of the body of hyoid bone

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7
Q

What is the action of omohyoid?

A

Depresses hyoid bone and hence larynx

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8
Q

What is the nerve supply of omohyoid?

A

Ansa cervicalis

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9
Q

Where does the central tendon of omohyoid pass?

A

The tendon between the two bellies passes through a sling behind SCM

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10
Q

What is the origin of thyrohyoid?

A

Oblique line on lamina of thyroid cartilage

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11
Q

What is the insertion of thyrohyoid?

A

Inferior border of body of hyoid bone

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12
Q

What is the action of thyrohyoid?

A

Elevates larynx or depresses hyoid bone

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13
Q

What is the nerve supply to thyrohyoid?

A

C1 fibres carried by the hypoglossal nerve XII

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14
Q

What is the origin of sternothyroid?

A

Medial and posterior aspect of the manubrium

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15
Q

What is the insertion of sternothyroid?

A

Oblique line of lamina of thyroid cartilage

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16
Q

What is the action of sternothyroid?

A

Depresses the larynx

17
Q

What is the nerve supply to sternothyroid?

A

Ansa cervicalis

18
Q

List the infrahyoid muscles

A

sternohyoid,
omohyoid
thyrohyoid
sternothyroid

19
Q

What are the actions of the infrahyoid muscles together? What effect does this have?

A

To depress the larynx, directly (Sternothyroid) or indirectly via the hyoid bone. This changes the volume of the resonating chambers and affects the quality of the voice.
Further action is to oppose the elevators of the larynx.

Anatomy: Neck (based on Dave's notes only so far) (30 decks)

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