Larynx(Page 142)

Dr.Sherif Fahmy

Skeleton of larynxA- Cartilages:

1- Single: Thyroid, cricoid and epiglottis.

2- Paired: Arytenoid, corniculate and cuneiform.

B- Membranes: Thyrohyoid, cricothyroid, cricotracheal and quadrangular. Dr.Sherif Fahmy

Thyroid cartilageDr.Sherif Fahmy

Thyroid cartilage

Cricoid cartilage

Quadrilateral lamina

Laryngeal prominence (Adam’s apple)

Hyoid bone

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Laryngeal prominence

Thyroid notchSuperior horn

Inferior horn

Oblique line

Thyoid cartilage Quadrilateral plate of cartilage

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Cricoid CartilageDr.Sherif Fahmy

Cricoid cartilage

Anterior arch

Posterior quadrate lamina

Articulation with inferior horn of thyroid cartilage

Site for arytenoid

Crico-tracheal ligament

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EpiglottisDr.Sherif Fahmy

Epiglottis

Stalk

Right thyroid lamina

Thyroepiglottic lig.Dr.Sherif Fahmy

Epiglottis

Thyroid cartilage

Arytenoid cartilage

Posterior quadrate cricoid cartilage

Thyro-epiglottic lig.

Posterior concave smooth surface

Posterior aspect

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Arytenoid cartilageThyroid cartilage (cut)

Quadrangular membrane

Epiglottis

Thyro-epiglottic lig.

Upper border

Lower border

Cricoid cartilageCrico-thyroid membrane

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Thyroid cartilage (cut)

Thyro-epiglottic lig.

Hyoid boneHyo-epiglottic lig.

Vestibular fold

Arytenoid cartilage

Ary-epiglottic fold

Epiglottis

Quadrangular membrane

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Oral part

Pharyngeal partMedian glosso-

epiglottic lig.

Lateral glosso-epiglottic folds

Epiglottis

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Arytenoid CartilagesDr.Sherif Fahmy

Arytenoid cartilageApex

Base

Vocal process

Muscular process

Cricoid cartilage

Muscular process

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Cricoid cartilage

Arytenoid cartilage

Vocal process

Vocal cord

Posterior quadrate lamina

Muscular processes

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Corniculate & Cuneiform Cartilages

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Cricoid cartilage (cut)

Arytenoid cartilageThyroid cartilage (cut)

Quadrangular membrane

Corniculate cartilage

Cuneiform cartilage

Epiglottis

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Ligaments, Membranes & Folds

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1- Thyro-hyoid Memrane

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Thyroid cartilage

Hyoid bone

Median thyrohyoid lig.

Lateral thin part

Perforation for passage of int. laryngeal n. and sup. Laryngeal art.

Lateral thyrohyoid lig.

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2- Ligaments & folds attached to epiglottis

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Arytenoid cartilageThyroid cartilage (cut)

Quadrangular membrane

Epiglottis

Thyro-epiglottic lig.

Upper border

Lower border

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Thyroid cartilage (cut)

Thyro-epiglottic lig.

Epiglottis

Hyoid boneHyo-epiglottic lig.

Vestibular fold

Arytenoid cartilage

Ary-epiglottic fold

Quadrangular membrane covered with mucus membrane

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Pharyngeal partMedian glosso-

epiglottic lig.

Lateral glosso-epiglottic folds

Epiglottis

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3- Ligaments attached to Cricoid cartilage

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Ligaments attached to Cricoid cartilage

Crico-tracheal ligament

1st tracheal ring

Cricoid cartilage

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Crico-thyroid lig.

Crico-vocal lig.

Cricoid cartilage

Thyroid cartilage

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Cricoid cartilage (cut)

Vocal process

Crico-vocal lig.

Cricothyroid lig.

Thyroid cartilage (cut)

Arytenoid cartilage

Vocal cord

Sagittal section of skeleton of larynx

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Cavity of Larynx(Page 148)

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Vestibular fold

Arytenoid cartilage

Ary-epiglottic fold Vestibule

Sinus

Infraglottic part

Cavity of larynx

Vocal fold

Epiglottis

Sagittal section

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Vestibule

Infra-glottic part

Sinus

Cavity of LarynxEpiglottis

Ary-epiglottic fold

Vestibular fold

Vocal fold

Coronal section

Saccule

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Inlet of Larynx

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Posterior view

Posterior wall of pharynx (Cut)

Piriform recess

Inlet of larynx

Pathway of food during swallowing Dr.Sherif Fahmy

Upper border of epiglottis

Ary-epiglottic fold

Inter-arytenoid fold

Cuneiform cartilage

Corniculate cartilage

Inlet of larynx

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Ary-epiglottic fold

Vestibular fold

Vocal foldSinus of larynx

Thyroid cartilage (cut)

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Muscles of LarynxDr.Sherif Fahmy

Crico-thyroid m.

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Epiglottis

Thyroid cartilage

Arytenoid cartilage

Posterior aspect

Transverse arytenoid

Oblique arytenoid m.

Ary-epiglottic m.

Posterior crico-arytenoid m.

Cricoid cartilage

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Cricoid cartilage

Arytenoid cartilage

Vocal cord

Muscular processes

Lateral crico-arytenoid m.

Vocalis m.

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Posterior crico-arytenoid m. Lateral crico-

arytenoid

Transverse arytenoid

Oblique arytenoid

Vocalis m.

Arytenoid cartilage

Cricoid cartilage

Thyroid cartilage

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Lateral crico-arytenoid m.

Posterior crico-arytenoid m.

Thyro-arytenoid m.

Thyro-epiglottic m.

Ary-epiglottic m.

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Superior view

Arytenoid

Vocal lig

Vocalis m.

Thyro-arytenoid m.

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Quiet respiration

Deep inspiration

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Abduction of vocal cord

Adduction of vocal cords

Closure of rima glottidis

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Nerve Supply1- Superior laryngeal Nerve.2- Recurrent laryngeal Nerve.

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Blood Supply1- Superior laryngeal artery.2- Inferior laryngeal artery.

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Applied AnatomyTracheostomy: A hole which is done in trachea or crico-thyroid membrane in case of laryngeal obstruction.

Dr.Sherif Fahmy