Anatomy of larynx

E-mail: a.al-nuaimi@sheffield.ac.uk E. mail: abdulameerh@yahoo.com

Prof. Abdulameer Al-Nuaimi

Larynx, extends from tip of epiglottis C3, to lower edge of cricoid cartilage C6. It is formed of cartilaginous framework, connected by ligaments and muscles, and lined by mucous membrane. Laryngeal cartilages: A- Single cartilages 1- Thyroid 2- Cricoid 3- Epiglottis B- Paired cartilages 1- Arytenoid 2-Corniculate 3-Cuneiform

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Relations of larynx

Laryngeal mucosa Larynx is lined by pseudo stratified ciliated columnar epithelium, with goblet cells (respiratory epithelium) Except the followings (they are covered by stratified squamous epithelium) 1-True vocal cords 2-Tip of epiglottis 3-Aryepiglottic fold

Thyroid cartilage

Skeleton of larynx

Laryngeal cartilages

Lamina of Cricoid cart

Arytenoid cart

aryt

Thy

Laryngeal cartilages

Joints and membranes of larynx Joints Cricothyroid joit Crico-arytenoid joint Membranes Conus elasticus Aryepiglottic membrane Throhyoid membrane

Laryngeal joints

Cricothyroid joint

Crico-arytenoid joint

C

Conus elasticus Larynx viewed from above

Arytenoid cartilage

Rima glottidis

(Conus elasticus)

(Aryepiglottic fold)

Laryngeal membranes

Aryepiglottic ligament

Thyrohyoid membrane

Aryepiglottic fold

Muscles of larynx Cricothyroid muscle Posterior Crico-arytenoid muscle Lateral Crico-arytenoid muscle Transverse arytenoid muscle Ary-epiglottic muscle Thyro-arytenoid muscle on the conus elasticus Vocalis muscle Thyro-epiglottic muscle

Larynx

Anatomy of Larynx

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Laryngeal sinus

Larynx coronal section

Posterior view of the larynx showing muscles of the larynx

Thyro-epiglottic muscle

Muscles of larynx

Rima glottidis

Adduction of vocal cords

Abduction of vocal cords Due to abduction of arytenoid

Abduction of vocal cords Due to rotation of arytenoids

Rima glottidis

Rima glottidis

Nerve supply 1- Motor: all muscles are supplied by Recurrent laryngeal nerve, except crico-thyroid muscle which is supplied by external branch of superior laryngeal nerve. 2- Sensory: Above vocal folds: by the internal branch of Superior laryngeal nerve Below vocal folds: by Recurrent laryngeal nerve.

Nerve supply of the larynx

Nerve supply of larynx

Nerve supply of larynx

Thank You

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