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The larynx. Dr. A yat El- D omouky. C4. Function, site. C6. C ontiuation. Hyoid. Epiglottis. Thyroid cartilage. Cricoid cartilage. Curniculate. Arytenoid cartilage. Cuneiform. Cartilages of the larynx 1.thyroid cartilage. Thyroid angle. - PowerPoint PPT Presentation
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Dr. Ayat El-Domouky
*The larynx
*Function, site
C4
C6
*Contiuation
4
Thyroidcartilage
Epiglottis
Cricoid cartilage
Hyoid
5
.
Arytenoidcartilage
Curniculate
Cuneiform
*Cartilages of the larynx1.thyroid cartilage
*Thyroid angle
*Cartilages of the larynx2.cricoid cartilage
*Cartilages of the larynx3. arytenoid cartilage
10
Base
Apex
Muscular process
Vocal process
Arytenoidcartilage
Corniculate cartilage
Cunieformcartilage
*Cartilages of the larynx4. epiglottis cartilage
Thyrohyoid and cricothyroid membranes
*Quadrangular & cricothyroid membrane membrane
*Vocal cords
*Inlet of the larynx
19
Laryngeal vestibule
Vestibular foldVocal fold
Infraglottic part
Laryngeal sinus
Muscles of the larynx1. obliquearytenoid (narrow the inlet) and 2.thyroepiglottic (widens the inlet)
3.Cricothyroidmuscletense the vocal cord
4.Thyroarytenoid (vocalis) (relax)
5.lateral cricoarytenoid (adducts)
6.posterior cricoarytenoid (abduct)
7.trnsverse arytenoid
23
Muscles of the larynx
Post.cricoarytenoid
Transverse arytenoid
Aryepiglottic
Oblique arytenoid
24
*Nerve Supply of the Larynx
*Sensory Nerves*Above the vocal cords: The internal laryngeal branch of the superior laryngeal branch of the vagus
*Below the level of the vocal cords: The recurrent laryngeal nerve
*Motor Nerves*All the intrinsic muscles of the larynx are supplied by the recurrent laryngeal nerve except The cricothyroid muscle is supplied by the external laryngeal branch of the superior laryngeal branch of the vagus.
*Blood Supply of the Larynx*superior thyroid artery
*inferior thyroid artery
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Sup.laryngeal N.
Int.laryngeal N.
Ext.laryngeal N.
Recurrent Laryngeal N.
The position of the vocal folds after damage of vagus nerve
ENDOCRINE GLANDS
*PITUTARY GLAND
*Thyroid glandSiteThe thyroid gland consists of right and left lobes which extend from oblique line of thyroid cartilage to the level of 4th or 5th tracheal ringThe isthmus infront of 2nd,3rd,4th tracheal rings
*relations
*Antrolaterally : the sternomastoid and infrahyoid muscles
*Postolaterally: carotid sheathmedially: 2tubes, 2nerves and parathyroid glands
*Blodd supply
the superior thyroid artery
The external laryngeal nerve
The recurrent laryngeal nerve
The inferior thyroid artery
*Work sheetCompare between the vocal and vestibular folds
Vocal cordVestibular fold*Fixed
*No voice
*Vascular and pink in colour
*Mobile
*concerned with voice production
*Avascular and white in colour
1.2tubes: trachea and oesophagus
2.2 cartilages: thyroid and cricoid
3.2 nerves: recurrent and external laryngeal nerves
4.2 muscles: cricothyroid and inf. Constrictor muscle of pharynx
* Enumerate medial relations of thyroid gland
*MCQAll muscles of the larynx are innervated by recurrent laryngeal nerve except-----
A. Cricothyroid muscle
B. thyroarytenoid muscle
C. transverse arytenoid muscle
D. thyroepiglottic muscles
Regarding the arytenoid cartilage, all of the following are true except…………….
E. Small and pyramid shaped
F. Located at the back of the larynx
G. Articulate with the upper border of the cricoid cartilage
H. A muscular process give attachment to the vocal cord
Bilateral complete section of the recurrent laryngeal nerve results in…………………..
A. Weak voice
B. Loss of voice
C. Acute respiratory distress
D. No great effect
Bilateral partial section of the recurrent laryngeal nerve results in…………………..
E. Weak voice
F. Loss of voice
G. Acute respiratory distress
H. No great effect
unilateral section of the recurrent laryngeal nerve results in…………………..
I. Weak voice
J. Loss of voice
K. Acute respiratory distress
L. No great effect
The vocal cord is ---------
a. The upper end of quadrangular membrane
b. The lower end of quadrangular membrane
c. The upper end of cricothyroid membrane
d. The lower end of cricothyroid membrane
The vestibular cord is ---------
e. The upper end of quadrangular membrane
f. The lower end of quadrangular membrane
g. The upper end of cricothyroid membrane
The lower end of cricothyroid membrane
The aryepiglottic fold is ---------
h. The upper end of quadrangular membrane
i. The lower end of quadrangular membrane
j. The upper end of cricothyroid membrane
k. The lower end of cricothyroid membrane
Superior thyroid artery is branch of---------------
a. Internal carotid artery
b. External carotid artery
c. Common carotid artery
d. Thyrocervical trunk
inferior thyroid artery is branch of---------------
e. Internal carotid artery
f. External carotid artery
g. Common carotid artery
h. Thyrocervical trunk