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Anatomy 2 > Muscles of the Larynx > Flashcards

Muscles of the Larynx Flashcards

1
Q

Name the 5 major muscles of the larynx

A
  1. Cricothyroid
  2. Thyroarytenoid
  3. Posterior cricoarytenoid
  4. Lateral cricoarytenoid
  5. Transverse arytenoids
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2
Q

What is the origin of the cricothyroid muscle?

A

Anterolateral part of cricoid cartilage

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3
Q

What is the insertion of the cricothyroid muscle?

A

Inferior part of thyroid cartilage

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4
Q

What is the innervation of the cricothyroid muscle?

A

Vagus through external laryngeal nerve

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5
Q

What is the main action of the cricothyroid muscle?

A

Tenses vocal ligaments

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6
Q

What are the 2 origins of the thyroarytenoid muscle?

A
  1. Inner surface of thyroid cartilage

2. Cricothyroid ligament

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7
Q

What is the insertion of the thyroarytenoid muscle?

A

Anterolateral surface of arytenoid

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8
Q

What is the innervation of the thyroarytenoid muscle?

A

Recurrent laryngeal nerve

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9
Q

What is the main action of the thyroarytenoid muscle?

A

Relax vocal ligaments

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10
Q

What is the origin of the posterior cricoarytenoid muscle?

A

Posterior surface of cricoid cartilage

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11
Q

What is the insertion of the posterior cricoarytenoid muscle?

A

Muscular process of arytenoid cartilage

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12
Q

What is the innervation of the posterior cricoarytenoid muscle?

A

Recurrent laryngeal nerve

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13
Q

What is the main action of the posterior cricoarytenoid muscle?

A

Abduct the vocal ligaments

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14
Q

What is the origin of the lateral cricoarytenoid muscle?

A

Arch of cricoid cartilage

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15
Q

What is the insertion of the lateral cricoarytenoid muscle?

A

Muscular process of arytenoid cartilage

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16
Q

What is the innervation of the lateral cricoarytenoid muscle?

A

Recurrent laryngeal nerve

17
Q

What is the main action of the lateral cricoarytenoid muscle?

A

Adduct vocal ligaments

18
Q

What is the origin of the transverse arytenoids?

A

One arytenoid cartilage

19
Q

What is the insertion of the transverse arytenoids?

A

Contralateral arytenoid cartilage

20
Q

What is the innervation of the transverse arytenoids?

A

Recurrent laryngeal nerve

21
Q

What is the main action of the transverse arytenoids?

A

Adduct posterior part of rima glottidis

22
Q

Name 3 muscles responsible for narrowing the laryngeal inlet

A
  1. Oblique arytenoid
  2. Aryepiglottic muscle
  3. Thryroepiglottic muscle
23
Q

Name the muscle responsible for increasing length and tension of vocal ligaments

A

Cricothyroid

24
Q

Explain how the vocal ligaments are lengthened and tensed

A

Cricothyroid increases distance between angle of thyroid cartilage and vocal process of arytenoid cartilages

25
Q

Name the muscle responsible for decreasing length and tension of vocal ligaments

A

Thyroarytenoid

26
Q

Explain how the length and tension in vocal ligaments is decreased

A

Thyroarytenoid pulls arytenoid cartilage forward toward the thyroid cartilage

27
Q

What occurs if the posterior cricoarytenoid is paralysed?

A

Asphyxia

28
Q

What are the 2 divisions of the superior laryngeal nerve?

A
  1. External laryngeal nerve

2. Internal laryngeal nerve

29
Q

Where does the external laryngeal nerve supply?

A

Cricothyroid muscle

30
Q

Where does the sensory part of the internal laryngeal nerve supply?

A

Laryngeal cavity to the level of the vocal ligaments

31
Q

Where does the sensory part of the recurrent laryngeal nerve supply?

A

Laryngeal cavity below the level of the vocal ligaments

32
Q

Where does the motor part of the recurrent laryngeal nerve supply?

A

All intrinsic muscles of larynx except cricothyroid

33
Q

What is the lymphatic drainage of the larynx above the level of the vocal ligaments?

A

Superior deep cervical lymph nodes

34
Q

What is the lymphatic drainage of the larynx below the level of the vocal ligaments?

A

Inferior deep cervical lymph nodes

Anatomy 2 (24 decks)

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