Anatomy of larynx
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Transcript of Anatomy of larynx
Larynx
Dr Laxman KhanalAssistant Professor, Department of Anatomy
BPKIHS, DharanPBL –Resource session
06-03-2017
Introduction
• It is organ of phonation.
• Inlet for lower respiratory passage
• Has role in deglutition with pharynx
• Lies in anterior midline of neck.
• Extends from C3-C6 level.
• Length – 3.5-4.5 cm
• Contains- cartilages
- joints, membranes and ligaments
- muscles
Ligaments1. Extrinsic ligamentsa. Thyrohyoid membraneb. Thyroepiglottic ligamentsc. Hyoepiglottic ligamentsd. Cricotracheal ligaments2. Intrinsic ligamentsa. Crico-thyroid membrane (Quadrangular membrane)b. Vestibular ligamentc. Vocal ligamentsd. Cricovocal membrane (Conus elasticus)
Components of larynx• Cartilages: 3 paired + 3 unpaired• Ligaments: extrinsic + intrinsic • Bone: Hyoid• Muscles: extrinsic + Intrinsic
Skeleton of larynxThree median cartilagesThree bilateral cartilages
+Hyoid bone
Parts of thyroid cartilageMembranes
Thyro-hyoid membrane
Superior laryngeal vessels Internal laryngeal nerve
Hyoepiglottic membraneThyroepiglottic membraneThyrohyoid membraneCricotracheal membrane
Parts of thyroid cartilageParts of cricoid cartilageArytenoid cartilage
Lamina Cornu
Lamina
Lets focus on vocal process of arytenoid cartilage to understand intrinsic ligaments
• Vocal process• Muscular process• Vocal ligament• Vestibular ligament
1. Digastric muscle2. Stylohyoid muscle3. Palatopharyngeu4. Stylopharyngeus5. Thyrohyoid6. Sternothyroid
Extrinsic muscle of larynx
Intrinsic Muscles of Larynx
To understand the functions of musclesThink about !!!!1. The antero-posterior movement of epiglottis.2. The distance between thyroid and arytenoid
cartilage.3. Movement of two arytenoid with each other.
Rima glottidis and phonationIntermembranous partIntercartilagenous part
Singer’s noduleTeacher’s nodule !!!
Nerve supply Motor supply: recurrent laryngeal nerveexcept cricothyroid, which is supplied by theexternal laryngeal nerve.
Nerve supply Motor supply: recurrent laryngeal nerveexcept cricothyroid, which is supplied by theexternal laryngeal nerve.
Sensory supply: internal laryngeal nerveand recurrent laryngeal nerve.Demarcation: Vocal fold
Blood supplySuperior laryngeal vesselsInferior laryngeal vesselsDemarcation: vocal fold
Blood supply/ sensory supplySup laryngeal vessel/ internal laryngeal nerveInf laryngeal vessel/ recurrent laryngeal nerve