Anatomy and Physiology of Larynx , Action of Laryngeal muscles , Dr Bhanu prakash — Transcript

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1. 0:00[Music]
2. 0:06next is the larynx the larynx is
3. 0:09organized into three major regions
4. 0:14vestibule which is between the entrance
5. 0:16of the Lings and the vestibular folds
6. 0:19considered to be false vocal cords and
7. 0:23the vestibular folds contain the
8. 0:25vestibular ligaments which are thicken
9. 0:28inferior edges of the quadrangular
10. 0:31membrane and next are the ventricles the
11. 0:34portion between the false vocal cords
12. 0:37superiorly and the true vocal cords
13. 0:39inferiorly they form vocal
14. 0:42folds the vocal folds contain the vocal
15. 0:46ligaments which are thickenings of the
16. 0:48superior edge of the conus
17. 0:51elasticus vibrations of the adducted
18. 0:53vocal ligaments with expiration produce
19. 0:56a sound and the third one is
20. 0:58infraglottic cavity so portion of the
21. 1:02larynx inferior to the vocal folds is
22. 1:04called as infraglottic cavity it
23. 1:07communicates distally with the Lumen of
24. 1:10the trachea so the larynx is composed of
25. 1:13a cartilagenous skeleton that is the
26. 1:15thyroid cartilage composed of two lamin
27. 1:18and the two pairs of cornea and the next
28. 1:21is
29. 1:22lamin the plates which form the majority
30. 1:25of the thyroid cartilage called lamini
31. 1:28and the indentation in the midline is
32. 1:30known as the superior thyroid Notch and
33. 1:34the inferior Fingal constrictor
34. 1:37sternothyroid and thyroid muzzles all
35. 1:40attached to the lamin and the next is
36. 1:44Cara finger like projections that extend
37. 1:47superiorly and inferiorly from the Lavin
38. 1:51thyrohyoid membrane is a connective
39. 1:54tissue membrane which connects the
40. 1:56thyroid cartilage to the hyid Bone and
41. 1:59the next is cricoid
42. 2:01cartilage it is composed of a narrow
43. 2:03anterior Arch and a broad posterior
44. 2:07lamina and what is the arch this Arch
45. 2:11connects the thyroid cartilage
46. 2:13superiorly via median CCO thyroid
47. 2:16ligament and to the first tracheal ring
48. 2:18inferiorly via Creo tracheal
49. 2:22ligament and the next is
50. 2:24lamina so it articulates superiorly with
51. 2:27the aroid cartilages and in inferior
52. 2:30Cara of the thyroid cartilage and what
53. 2:33is the clinical
54. 2:35correlate in the event of an emergency
55. 2:38if an airway cannot be established by
56. 2:41endot trial intubation then CCO
57. 2:44thyroidotomy can be done where the creco
58. 2:47thyroid membrane is
59. 2:49incased and next is the aroid
60. 2:52cartilages pyramidal cartilages that
61. 2:55articulates at their base with the
62. 2:57lamina of the creid cartilage
63. 3:00and uh the muscular process that extends
64. 3:03laterally and provides attachment points
65. 3:05for the
66. 3:06muscles and next the vocal process that
67. 3:09extends anteriorly and it is the
68. 3:12attachment point for the vocal ligaments
69. 3:15and these are the following are the
70. 3:17muzzles of the laryn CCO thyroid which
71. 3:20tilts the thyroid cartilage forwards and
72. 3:23the main action tenses and adducts the
73. 3:26vocal ligaments and next is the
74. 3:29posterior aroid which laterally rotates
75. 3:32the aroid cartilage and the action is
76. 3:36abducts the vocal ligaments so note an
77. 3:39important point over here that these
78. 3:42muzzles are the only abductors of the
79. 3:45vocal ligaments and are that extremely
80. 3:48important in maintaining an open Airway
81. 3:51and the next one is the lateral C aroid
82. 3:54which medially rotates the aroid
83. 3:56cartilage and the main action it the
84. 4:00vocal ligaments and
85. 4:03aroids composed of transverse as well as
86. 4:06oblique parts and action is adduct the
87. 4:09vocal ligaments and thyro
88. 4:12aroids from the thyroid laminate to the
89. 4:15aroid cartilage and the action is adduct
90. 4:18the vocal ligaments and the thyro epicus
91. 4:22from the thyroid lamin to the lateral
92. 4:25aspect of the epiglottis and the main
93. 4:28action it holds epiglottis closed during
94. 4:31swallowing to prevent the entrance of
95. 4:34the food or liquid into the larynx
96. 4:37during de glutation and what are the
97. 4:39nerves of larynx one is a superior
98. 4:42lingal nerve which divides into internal
99. 4:46and external lingal nerves the internal
100. 4:49lingal nerve enters the thyroid membrane
101. 4:52with Superior lingal artery and provides
102. 4:56sensory Innovation to the mucosa
103. 4:58superior to the fcal folds and next is
104. 5:01the external lingal nerve which Travels
105. 5:04With The Superior thyroid artery and
106. 5:06provides motor innervation to the Creo
107. 5:10thyroid muscles and next are the
108. 5:13recurrent lenal nerves so one is right
109. 5:17another one is left the right one Loops
110. 5:20under the subclavian artery and the left
111. 5:22one Loops under the arch of Iota and
112. 5:26both Ascend posterior to the esophagus
113. 5:29and enter the larynx at the level of CCO
114. 5:32thyroid articulation and motor ination
115. 5:36of all musles of the larynx except the
116. 5:39CCO thyroids
117. 5:41are explained over here in the nerve
118. 5:44section of the larynx and provide
119. 5:46sensory inovation to the mucosa of the
120. 5:49larynx inferior to the vocal folds and
121. 5:52the next is arteries of the larynx one
122. 5:55is the superior lingal artery which is
123. 5:57the branch of superior thyroid AR Ary
124. 6:00and travels with the internal lenal
125. 6:03nerve and next one is the inferior lenal
126. 6:06artery which is a branch of inferior
127. 6:08thyroid artery and it travels along with
128. 6:11the recurrent lingal nerve so this is
129. 6:14what we discussed about the anatomy as
130. 6:18well as the physiology of larynx