It consists of two flat lamina which fused in the midline anteriorlly and open posteriorly. Extending upward from each lamina is the superior cornu , and extending downward is the inferior cornu. At its top, is the thyroid notch
looks like a signet
ring,with a broad ,
flat, posterior lamina.
* It is the only complete
ring of cartilage in the
larynx. And it differs
from all other tracheal rings that it forms a complete circle. So it is the only rigid area in the respiratory tree. It is very important in maintaining the normal lumen of respiratory tract
(3)Arytenoid. are a
pair of small
cartilages . Perch
on top of the
lamina of cricoid
Each Arytenoids cartilage has two processes: a vocal process, to which the posterior end of vocal ligaments is attached, and a muscular process, to which the intrinsic laryngeal muscle is attached.
(4)Epiglottic cartilage:a pear-shaped,curved plate of cartilages covered by mucosa on both surfaces.
The superior half is above the level of hyoid bone and projects freely into the oropharynx.
There are just two pair of joints in the larynx,the cricoarytenoid(CA) and cricothyroid(CT),all the internal adjustments of the vocal cords are medeated through them.
CA: Enables the vocal cords to drawn away from the midline(abduction) or brought to midline(adduction).
CT: It is important in pitch control and provides a mechanism for regulating the