The larynx (voicebox), is an organ in the neck of mammals located at the beginning of the lower respiratory tract.
The larynx consists of four basic anatomic components: a cartilaginous skeleton, membranes and ligaments, muscles, and a mucosal lining.
The Cartilages:
Thyroid Cartilage
Cricoid Cartilage
Epiglottis
Arytenoid Cartilages
Corniculate Cartilages
Cuneiform Cartilages
Cartilages: anterior view (left), posterior view (middle) and lateral view (right).
Cartilages connected: anterior view (left), posterior view (middle) and lateral view (right).
Cricoid and arytenoids
Cartilages connected with ligaments and vocal ligament in place.
Cartilages connected with ligaments: anterior view (left), posterior view (middle) and sagital section (right).note that vestibular ligament and cuniform cartilage in place.
The Membranes and ligaments:
Extrensic Membranes
Thyrohyoid
Cricotracheal
Intrensic Membranes
Cricothyroid
Fibroelastic Membrane
-Quadrangular M.
-Triangular M.
The Muscles:
Posterior CricoArytenoid
Lateral CricoArytenoid
InterArytenoid
-Transverse- Oblique- AryEpiglottic
ThyroArytenoid
-Main - Vocalis – Fan projection
Cricothyroid
Posterior cricoarytenoid muscle: outward rotation of the arytenoid (abduction of the vocal cord).
Lateral cricoarytenoid muscle: inward rotaion of the arytenoid (adduction of the vocal cord).
Inter arytenoid muscle: transverse, oblique & aryepiglotic parts: (adduction & close inlet).
Thyroarytenoid muscle: proper, vocalis & fan: (adduction, tension & open inlet).
Cricothyroid muscle: tension of the vocal cord.
The Mucous Membrane:
Nerve Supply:
Blood Supply:
