Muscles of the Larynx Flashcards

1
Q

2 “groups” of muscles

A
  1. Intrinsic

2. Extrinsic

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2
Q

Intrinsic muscles of the larynx function

A
  • open
  • close
  • control tension

of the vocal cords

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3
Q

Extrinsic muscles of the larynx function

A
  • connects many structures [larynx to hyoid bone & others]

* moves the larynx as a WHOLE during phonation, swallowing, breathing

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4
Q

Intrinsic muscles of the larynx names (5)

*hint: controls vocal cord movement

A
  1. posterior cricoarytenoid
  2. lateral cricoarytenoid
  3. arytenoids
  4. cricothyroid
  5. thyroarytenoid
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5
Q

Action of the posterior cricoarytenoid muscle

In

A

ABducts (opens) the vocal cords & glottis

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6
Q

Action of the lateral cricoarytenoid muscle

In

A

ADducts (close) the vocal cords

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7
Q

Action of the arytenoid muscle

In

A

ADducts (close) the vocal cords

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8
Q

Action of the cricothyroid muscle

In

A
  • cord tension
  • closure -per pwpt (ADduction?? - not in pwpt)
  • elongates vocal cords

*can result in total & profound glottic closure = laryngospasm

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9
Q

Action of the thyroarytenoid muscle

In

A
  • shortens vocal cords

- relaxes vocal cords

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10
Q

muscle of the larynx responsible for laryngospasm

A

cricothyroid muscle

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11
Q

Extrinsic muscles of the larynx names (6)

A
  1. Sternohyoid
  2. Sternothyroid
  3. Omohyoid
  4. Thyrohyoid
  5. Stylohyoid
  6. Mylohyoid
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12
Q

Action of the sternohyoid muscle

Ex

A

hyoid bone INFERIOR

same as thyrohyoid

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13
Q

Action of the sternothyroid muscle

Ex

A

thyroid cartilage pulled caudad (towards tail, posterior end, down?)

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14
Q

Action of the thyrohyoid muscle

Ex

A

hyoid bone INFERIOR

same as sternohyoid

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15
Q

Action of the omohyoid muscle

Ex

A

hyoid bone caudad (towards tail, posterior end, down?)

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16
Q

Action of the stylohyoid muscle

Ex

A

ELEVATES larynx

17
Q

Action of the mylohyoid muscle

Ex

A

ELEVATES larynx

18
Q

“Strap” muscles (depress larynx)

infra-hyoid muscles

A
  1. Sternohyoid
  2. Sternothyroid
  3. Omohyoid
19
Q

“Up” muscles (elevates)

supra-hyoid muscles

A
  1. Mylohyoid
  2. Stylohyoid
  3. Thyrohyoid
20
Q

circular muscles of the pharynx

A
  1. superior pharyngeal constrictor
  2. middle pharyngeal constrictor
  3. inferior pharyngeal constrictor
21
Q

longitudinal muscles of the larynx

A
  1. stylopharyngeus
  2. palatopharyngeus
  3. salpingopharyngeus
22
Q

superior constrictor muscle

A

located in oropharynx
(CN X innervation)

  • assists to propel bolus of food into esophagus
23
Q

middle constrictor muscle

A

located in laryngopharynx/hypopharynx
(CN X innervation)

  • assists to propel bolus of food into esophagus
24
Q

inferior constrictor

A

located in laryngopharynx/hypopharynx
(CN X innervation)

  • assists to propel bolus of food into esophagus
25
Q

stylopharyngeus muscle innervation

A

innervated by glossopharyngeal

26
Q

circular muscles of the larynx “job”

A

propel food into esophagus

27
Q

longitudinal muscles of the pharynx “job”

A
  • shorten/widen pharynx

- elevate larynx during swallowing