Thyroid cartilage

 THYROID CARTILAGE 

Features:

• V-shaped in cross-section 
• Lamellae 
• it consists of right and left lamellae
• posterior parts of lamellae are far apart 
• anterior parts of lamellae approach each other 

• Laryngeal prominence 
• lower parts of right and left lamellae fuse to form this prominence 
• they are separated by thyroid notch
• posterior borders are free

• Superior horn 
• the lamellae project upwards to form the superior horns 
• the superior cornua are connected with greater cornua of hyoid bone through  thyrohyoid ligament 

• Inferior horn 
• articulates with cricoid cartilage to form cricothyroid joint
• it is connected to cricoid cartilage through conus elasticus 
• it is convex in the front and concave in the behind 

• oblique line
• the outer surface of the laminae is marked by a slight prominence called oblique line 
• extends from the superior thyroid tubercle to the superior cornua 
• attachments 
• thyrohyoid 
• sternohyoid 
• thyrophyrangeus part of the inferior constrictor 

Attachments :

• the lower border of the inferior cornua 
• gives attachments to cricothyroid 
• insertion at posterior border connecting superior and inferior cornua 

• palatophayrngeus
• salpinophayrangeus 
• stylopharyngeus 

• inner aspect attachments 
• median thyroepiglottic ligament 
• thyroepiglottic muscle on both sides 
• vestibular fold on both sides 
• vocal fold on both sides 
• thyroarytenoid 
• vocalis muscle on each side