details about larynx

1. Anatomy of larynx
By:-
safalta thakur

2. larynx
Hollow musculoligamentous structure with cartilaginous framework

3. Location
• Front of hypopharynx.
• Opposite the third to sixth cervical
vertebrae.
• Above opens into pharynx
immediately posterior to tongue.
• Below continuous to trachea.

4. unpaired
• Thyroid
• Cricoid
• Epiglottis
paired
• Arytenoid
• Corniculate
• Cuneiform
Laryngeal cartilages

5. Thyroid cartilage
Largest laryngeal cartilage

6. Cricoid cartilage

7. Epiglottis cartilage

8. Arytenoid cartilage

9. Laryngeal membranes
extrinsic
• Ligament or membrane attached
to structure outside the larynx
intrinsic
• Membrane join within the larynx

10. Intrinsic membrane
Cricovocal membrane:- Triangular membrane its upper border is free and stretches between middle of
thyroid angle to vocal process of arytenoid and forms a vocal ligament.

11. Quadrangular membrane
• It stretches between epiglottic and arytenoid
cartilage.
• Its lower border forms the vestibular
ligament which lies in the false cord.

12. Intrinsic muscle of larynx
Acting on vocal cords
• Abductor:-
posterior cricoarytenoid
• Adductor:-
lateral cricoarytenoid
Interarytenoid
thyroarytenoid
• Tensor:-
Cricothyroid
Vocalis
Acting on laryngeal inlet
• Openers of laryngeal inlet:-
Thyroepiglottic
• Closers of laryngeal inlet:-
Obliquearytenoid

14. Cavity of larynx
• Inlet
• Inferiorly open into trachea
Division of larynx
 Vestibule
 middle part
 Infraglottic space

15. Laryngeal ventricles and saccules
• ventricle:- Mucosa of middle cavity bulges laterally through gap between vestibular and vocal
fold.
• Saccule:-tubular extension vestibular of each ventricle project anterosuperiorly between vestibular
fold and thyroid cartilage

16. Rima glottidis Rima vestibule
• Triangular opening between the
two adjacent vocal folds.
• Triangular opening between the
two adjacent vestibular folds.

17. False vocal cord True vocal cord
• It contain vestibular ligament, a
few fibres of thyroarytenoideus
muscle and mucous glands.
• It consist of a vocal ligament
which is the true upper edge of
cricovocal membrane covered by
closely bound mucous
membrane .

18. Phonation
• During phonation arytenoid cartilage and vocal folds are adducted .
• Air forced through closed rima glottis
• Causes vibration of vocal cord against each other and production of
sound.

19. Nerve supply
Motor supply
Recurrent laryngeal nerve
Sensory supply
Above vocal cord:-Internal laryngeal nerve
Below vocal cord:-Recurrent laryngeal nerve

20. Artery supply