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Anatomy of the larynx Prepared by   Dr. Muaid I. Aziz Otolaryngologist–head & neck surgeon M.B.Ch.B  F.I.C.M.S
<ul><li>The Larynx is the organ of voice production </li></ul><ul><li>placed at the upper part of the air passage. </li></...
<ul><li>The framework of the larynx consist of :- </li></ul><ul><li>Hyoid bone </li></ul><ul><li>Cartilaginous skeleton </...
U-shaped bone  w give attachment for many of the ext. muscles of the larynx & suspend it in the neck   Hyoid bone
<ul><li>9 diff. seg.of cart. </li></ul><ul><li>3 unpaired  (epiglottis, thyroid , cricoid) </li></ul><ul><li>3  Paired  (a...
<ul><li>composed of  elastic fibrocartilage  Shaped like a leaf , project upwards behind the tongue & hyoid body. </li></u...
Attached to the tongue base via median& lateral Glossoepiglottic folds w form depression called vallecula.
Thyroid cartilage <ul><li>2 quadrilateral-shaped lamina fused in the midline  in 90-120 degree </li></ul><ul><li>level of ...
<ul><li>the only complete ring. </li></ul><ul><li>Signet ring w narrow arch ant. & a broad lamina post. </li></ul><ul><li>...
<ul><li>Irregular , 3-sided pyramids w </li></ul><ul><li>forward projection  (vocal process ) attached to the vocal folds ...
<ul><li>2 synov. J.: cricothyroid & cricoaryt. </li></ul><ul><li>Cricothyroid j  allowing changes in the v.c lengh. </li><...
<ul><li>Abduction </li></ul><ul><ul><li>Posterior cricoarytenoid </li></ul></ul><ul><li>Adduction </li></ul><ul><ul><li>La...
Anatomy:laryngeal motion <ul><li>Vocal cord   abduction of </li></ul>
Adduction of vocal cord
Tension of vocal ligament
<ul><li>Infrahyoid strap m.: </li></ul><ul><li>Depress the hyoid & larynx </li></ul><ul><li>thyrohyoid </li></ul><ul><li>S...
<ul><li>The ext. lig. Connect the laryngeal cart. to the hyoid above & trachea below </li></ul>Ligaments & membranes   of ...
<ul><li>The int. lig. Connect the laryngeal cart. together.  Elastic memb. W supports endolarynx has an </li></ul><ul><li>...
 
 
Spaces within the larynx <ul><li>Pre-epiglottic space: </li></ul><ul><li>Ant: th.c & thyro-hyoid memb. </li></ul><ul><li>p...
<ul><li>Paraglottic space is formed by the : </li></ul><ul><li>thyroid lamina lat. </li></ul><ul><li>conus elasticus &quad...
Internal branch of s.l.n Nerves of the Larynx
Vocal fold histology
                                                                                                
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E.N.T.Embryology & anatomy.(dr.mwaed)

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  • Transcript of "E.N.T.Embryology & anatomy.(dr.mwaed)"

    1. 1. Anatomy of the larynx Prepared by Dr. Muaid I. Aziz Otolaryngologist–head & neck surgeon M.B.Ch.B F.I.C.M.S
    2. 2. <ul><li>The Larynx is the organ of voice production </li></ul><ul><li>placed at the upper part of the air passage. </li></ul><ul><li>It is situated between the trachea and base of the tongues, lies opposite the 3 rd - 6 th cervical vertebrae. </li></ul>Anatomy
    3. 3. <ul><li>The framework of the larynx consist of :- </li></ul><ul><li>Hyoid bone </li></ul><ul><li>Cartilaginous skeleton </li></ul><ul><li>muscles </li></ul><ul><li>Ligaments & membranes </li></ul><ul><li>neurology </li></ul>
    4. 4. U-shaped bone w give attachment for many of the ext. muscles of the larynx & suspend it in the neck Hyoid bone
    5. 5. <ul><li>9 diff. seg.of cart. </li></ul><ul><li>3 unpaired (epiglottis, thyroid , cricoid) </li></ul><ul><li>3 Paired (arytenoid , corniculate ,cuneiform) </li></ul>Cartilaginous skeleton
    6. 6. <ul><li>composed of elastic fibrocartilage Shaped like a leaf , project upwards behind the tongue & hyoid body. </li></ul><ul><li>connected to the hyoid & thyroid cart. by hyoepiglottic & thyroepiglottic lig. Respectively. </li></ul>Epiglottis
    7. 7. Attached to the tongue base via median& lateral Glossoepiglottic folds w form depression called vallecula.
    8. 8. Thyroid cartilage <ul><li>2 quadrilateral-shaped lamina fused in the midline in 90-120 degree </li></ul><ul><li>level of v.c in the males is halfway bet. the notch & inf. edge of thy. c </li></ul><ul><li>Wile in the females is 1/3 the distance. </li></ul>Oblique line
    9. 9. <ul><li>the only complete ring. </li></ul><ul><li>Signet ring w narrow arch ant. & a broad lamina post. </li></ul><ul><li>At C3-4 in child </li></ul><ul><li>At C6-7 in adult </li></ul>Cricoid cartilage
    10. 10. <ul><li>Irregular , 3-sided pyramids w </li></ul><ul><li>forward projection (vocal process ) attached to the vocal folds </li></ul><ul><li>Lateral projection (musc.process) (PCA ,LCA) m. </li></ul><ul><li>Apical process attached to the aryepiglottic fold </li></ul>Vocal process cricoid cart Muscular process Arytenoid cart Arytenoid cartilage
    11. 11. <ul><li>2 synov. J.: cricothyroid & cricoaryt. </li></ul><ul><li>Cricothyroid j allowing changes in the v.c lengh. </li></ul><ul><li>Cricoaryt. J helps to manipulate the v.c in needed direction. </li></ul>
    12. 12. <ul><li>Abduction </li></ul><ul><ul><li>Posterior cricoarytenoid </li></ul></ul><ul><li>Adduction </li></ul><ul><ul><li>Lateral cricoarytenoid </li></ul></ul><ul><ul><li>Transverse arytenoid </li></ul></ul><ul><ul><li>Oblique arytenoid </li></ul></ul><ul><li>Tension </li></ul><ul><ul><li>Thyroarytenoid </li></ul></ul><ul><ul><li>Cricothyroid </li></ul></ul>Intrinsic Muscles of the Larynx
    13. 13. Anatomy:laryngeal motion <ul><li>Vocal cord abduction of </li></ul>
    14. 14. Adduction of vocal cord
    15. 15. Tension of vocal ligament
    16. 16. <ul><li>Infrahyoid strap m.: </li></ul><ul><li>Depress the hyoid & larynx </li></ul><ul><li>thyrohyoid </li></ul><ul><li>Sternohyoid </li></ul><ul><li>Sternothyroid </li></ul><ul><li>Suprahyoid strap m: </li></ul><ul><li>Elevate the hyoid & larynx </li></ul><ul><li>Stylohyoid </li></ul><ul><li>Diagastric </li></ul><ul><li>Mylohyoid </li></ul><ul><li>Genohyoid </li></ul><ul><li>Stylopharyngeus </li></ul><ul><li>Palatopharyngeus </li></ul><ul><li>salpngopharyngeus </li></ul>Extrinsic Muscles of the Larynx
    17. 17. <ul><li>The ext. lig. Connect the laryngeal cart. to the hyoid above & trachea below </li></ul>Ligaments & membranes of the larynx
    18. 18. <ul><li>The int. lig. Connect the laryngeal cart. together. Elastic memb. W supports endolarynx has an </li></ul><ul><li>upper part ( quadrangular memb. W spans from aryt. to epig.) </li></ul><ul><li>the free inf. edge is called ventricular lig .= false v.c. </li></ul><ul><li>the free sup. edge ultimately forms(AE)fold </li></ul><ul><li>Lower part (conus elasticus) w spans from sup. border of cricoid to the lower ant. border of thy.cart., thus forming crico - thyroid memb. </li></ul><ul><li>Vocal lig. , the sup. edge of the conus elasticus,is the fibrous core of v.c w extend from ant. midline of thy.c (broyles lig.) to v. process of aryt. Cart. </li></ul>
    19. 21. Spaces within the larynx <ul><li>Pre-epiglottic space: </li></ul><ul><li>Ant: th.c & thyro-hyoid memb. </li></ul><ul><li>post: epig.& thyr-epig. Lig. </li></ul><ul><li>Sup: hyo-epig.lig .& vallecular mucosa </li></ul>Pre-epiglottic space
    20. 22. <ul><li>Paraglottic space is formed by the : </li></ul><ul><li>thyroid lamina lat. </li></ul><ul><li>conus elasticus &quadrangular memb. </li></ul><ul><li>Med. </li></ul><ul><li>pyriform fossa post. </li></ul>
    21. 23. Internal branch of s.l.n Nerves of the Larynx
    22. 24. Vocal fold histology
    23. 25.                                                                                                 
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