chapter 3 - laryngeal structure & function

3 types of valve functions

respiration, breath control, voice production

skeletal framework

made up of 5 cartilages and 1 bone: arytenoid cartilage, corniculate cartilage, thyroid cartilage, cricoid cartilage, epiglottis, hyoid bone

5 cartilages

make up joints

hyoid bone

protect or move muscles of the larynx

thyroid cartilage

protects larynx

cricoid cartilage

prevents trachea from collapsing

epiglottis

covers larynx during swallowing

hyoid bone

anchor point for muscles and ligaments that move the larynx

arytenoid and corniculate cartilages

essential for vocal fold movement

laryngeal joints

allow fluid movement and add stability

essential for airway function and voice

cartilage to cartilage (not bone to bone)

cricothyroid joing

stretching changes pitch

passive laryngeal forces

recoil of muscles, cartilages, and connective tissue

surface tension

gravity

active laryngeal forces

intrinsic muscles (both attachments inside the larynx)

extrinsic muscles (one attachment inside the larynx and one outside the larynx)

supplementary muscles both attachments outside the larynx; actions influence the larynx through the hyoid bone