403 Larynx Muscles and Nerves

extrinsic

intrinsic or extrinsic?

these laryngeal muscles attach to hyoid bone

intrinsic

intrinsic or extrinsic?

these laryngeal muscles affect vocal ligaments by ab/adducting vocal folds (phonation - adducted ; ventilation - abducted)

posterior crico-arytenoid m.

lateral rotation of arytenoids and abduction of vocal folds

opens rima glottidis

ventilation/allows for breathing

no effect on phonation

recurent laryngeal nerve

the posterior crico-arytenoid muscles are innervated by which nerve

transverse and oblique arytenoid mm.

adducts arytenoids and vocal ligaments

approximates vocal folds for phonation

narrows rima glottidis

recurrent laryngeal nerve

the transverse and oblique arytenoid muscles are innervated by which nerve

lateral crico-arytenoid m.

medial rotation of arytenoids and adduction of vocal folds

shortens and relaxes vocal ligaments

narrows rima glottidis

approximate vocal folds for phonation

decreases pitch

recurrent laryngeal nerve

the lateral crico-arytenoid muscle is innervated by which nerve

thyro-arytenoid m.

glides arytenoids toward thyroid cartilage

adduct vocal ligaments?

no effect on rima glottidis

decrease tension and decrease pitch

vocalis m.

adjacent to vocal ligaments

Adds lateral tension to vocal ligaments

Affects timbre and finely increases pitch

no effect on rima glottidis

recurrent laryngeal nerve

the thyro-arytenoid mm. and vocalis mm. are innervated by which nerve

cricothyroid m.

Anteriorly tips thyroid cartilage

lengthens and increases tension on vocal cords which increases pitch

no effect on rima glottidis

external branch of superior laryngeal nerve

the cricothyroid muscle is innervated by which nerve

internal branch of superior laryngeal nerve

this nerve carries afferent from (& secretomotor to) mucosa superior to vocal fold

superior thyroid artery

this laryngeal artery runs with internal branch of superior laryngeal nerve

inferior thyroid artery

this laryngeal artery runs with reccurent laryngeal nerve

cricothyroid m.

muscle attaches from cricoid to thyroid cartilage

lateral and posterior crico-arytenoid mm.

muscle attaches from cricoid cartilage to arytenoid cartilages (2)

thyro-arytenoid m.

this muscle makes up the bulk of the vocal fold

transverse arytenoid m.

this muscle spans the space between each of the arytenoid cartilages

thyro-arytenoid m.

this muscle contains vocalis muscles