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Anatomy > Functions of larynx > Flashcards

Functions of larynx Flashcards

1
Q

What is the function of the intrinsic muscles of the larynx?

A

Control laryngeal inlet

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2
Q

What are the intrinsic muscles of the larynx?

A 
Aryepiglottic
Thyroepiglottic
Posterior cricoarytenoid
Lateral cricoarytenoid
Interarytenoid
Cricothyroid
Thryoarytenoid
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3
Q

What are the attachments of aryepiglottic muscle?

A

From the muscular process of one arytenoid to the apex of the other then to the lateral aspect of the epiglottis

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4
Q

What is the function of posterior cricoarytenoid?

A

Abduction (opening) of vocal folds

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5
Q

What is the function of lateral Cricoarytenoid?

A

Adduction (closing of vocal folds)

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6
Q

What is the function of interarytenoids?

A

Adduction of vocal folds

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7
Q

What are the attachments of interarytenoid muscles?

A

Muscular process of one to apex of the other

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8
Q

What is the function of criocthyroid?

A

Contract to lengthen the vocal folds

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9
Q

What is the function of thryoarytenoid?

A

Contract to shorten coal folds and close vestibule

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10
Q

What is the motor innervation of the laryngeal muscles?

A

All recurrent laryngeal (branch of X) except cricothryoid which is external laryngeal nerve (branch of X)

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11
Q

What is the sensory innervation of the larynx?

A

Below focal folds = recurrent laryngeal

Above vocal folds = internal laryngeal

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12
Q

What provides the blood supply to larynx?

A

Superior and inferior thyroid artery

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13
Q

What provides venous drainage to the larynx?

A

Laryngeal veins drain into superior and inferior thyroid veins which drain into internal jugular vein which drains into the left brachiocephalic vein

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14
Q

What is the function of the larynx when fully open?

A

Ventilation

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15
Q

What is the function of the larynx when half open?

A

Phonation

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16
Q

What is the function fo the larynx when fully closed?

A

Swallowing, ingestion of forgein bodies

17
Q

How does phonation occur?

A

Vocal folds adducted during expiration, this increases pressure, when they open air is released and they close again and cycle repeats

18
Q

What muscles raise the larynx?

A

Suprahyoid and infrahyoid muscles and longitudinal muscles of the pharynx

19
Q

How does the larynx provide protection against ingestion of forgein matter?

A

Larynx is raised and epiglottis lowers passively, this closes laryngeal inlet, vocal folds adduct

20
Q

What are the 3 stages swallowing?

A

Oral (voluntary) stage
Pharyngeal stage
Oesophageal stage

21
Q

What forms in the oral stage of swallowing?

A

Bolus forms

22
Q

When does the cough reflex occur?

A

Forgein body in supraglottic cavities detected by sensory receptors

23
Q

What is the cough reflex?

A

Initial deep inspiration, VF adduct tightly, this increases thoracic pressure by forceful expiration against closed vocal folds, VF open suddenly, forgein body is dislodged.

Anatomy (40 decks)

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