This is the voice box. It extends from its junction, with the trachea, at level of C6 to pharynx.

 

It contains six cartilages, (corniculate, arytenoid, epiglottis, cricoid, cuneiform and thyroid cartilages), and many membranes. It has other structures as follows.

Muscles:

Intrinsic: Cricothyroid, posterior cricoarytenoid, lateral cricoarytenoid, oblique arytenoid, transverse arytenoid, thyroarytenoid, vocalis, thyroepiglottic, aryepiglotticus

Extrinsic: Thyrohyoid (raises larynx in swallowing), stylopharyngeus (assists elevation), palatophayngeus (assists elevation), sternothyroid (opens laryngeal orifice)

Arteries:

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Superior thyroid artery (from the external carotid artery)

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Inferior thyroid artery (from the thyrocervical trunk of the 1st part of right subclavian artery and left subclavian artery.

Veins of the larynx

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Superior thyroid vein drains into internal jugular vein

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Inferior thyroid vein drains into left brachiocephalic vein

Nerves of larynx

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External branch of superior laryngeal nerve (a branch of vagus)

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Internal branch of the superior laryngeal nerve (a branch of vagus)

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Left and right recurrent laryngeal nerve

Ligaments:

Thyrohyoid  membrane, lateral thyrohyoid ligament, cricotracheal ligament, hyo-epiglottic ligament, quadrangular membrane cricovocal membrane (cricothyroid ligament, which may be divided into median cricothyroid ligament [anterior cricothyroid ligament or conus elasticus], lateral cricothyroid, ligament), vocal ligament, vestibular fold, aryepiglottic fold, vestibular ligament, vocal folds.

 

 
Laryngeal ligaments and cords- 3D rotation

 

 

 

1 cricoid cartilage and larynx 2 laryngopharynx 3 nasopharynx 4 oropharynx 5 spenoidal air sinus 6 mouth cavity

1 thyroid notch 2 laryngeal prominence 3 cricoid cartilage 4 thyroid gland 5 internal jugular vein

 


1
inferior constrictor of pharynx cut, 2 cricothyroid 3 thyroid cartilage and prominence cut, 4 epiglottis 5 aryepiglotticus 6 thyroepiglotticus 7 superior thyroarytenoid 8 lateral cricoarytenoid 9 thyroarytenoidt

 

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