Larynx Flashcards
Laynx connects?
Lower part of pharynx to trachea
Larynx functions
- Prevent choking
2. Vocalization
Lyngeal cc. connections
Cr: hyoid b.
Cd: trachea
4 cc. of larynx
- Arytenoid c.
- Thyroid c.
- Cricoid c.
- Epiglottic c.
Epiglottic c. during swallowing?
Tilts backward to partially cover opening of larynx
Largest c. of larynx
Thyroid c.
Thyroid c. is open on which side?
Dorsally
Oblique line of thyroid c. is insertion for?
Sternothyroideus m.
Cr. laryngeal n. and a. pass through?
Rostral thyroid notch
Which side of cricoid c. is wider?
Dorsal > ventral
Lamina of cricoid c.
Expanded dorsal part with median crest (for m. attachment)
Articular facets of cricoid c.
- Cricoarytenoid articulation (rostral border of lamina)
2. Cricothyroid articulation (junction of lamina and arch)
Only paired laryngeal c.
Arytenoid c.
Attachments to cuneiform process
Vestibular lig. and m.
Attachments of vocal process
Vocal lig. and vocalis m.
Laryngeal cavity is divided into what 3 transverse segments?
- Vestibule (rostral to glottis)
- Rima glottidis (middle, narrow)
- Infraglottic cavity (cd. to glottis)
Rima glottidis aka?
Glottic cleft
Vestibule of larynx extends from ? to ?
Laryngeal inlet to vestibular fold
Vestibule of larynx opens freely where?
Dorsorostrally
Laryngeal inlet lies?
Directly cd. to intrapharyngeal ostium
Borders of laryngeal inlet
Lateral: epiglottis
Cd: right and left aryeopiglottic folds
Vestibular fold extends from ? to ?
Cuneiform process to thyroid c.
Glottis consists of?
- Arytenoid c.
2. Vocal fold
Narrowest part of laryngeal passageway
Rima glottidis
2 parts of rima glottidis
- Intercartilagenous part
2. Intermembranous part
Intercartilagenous part of rima glottidis is located between?
Medial surfaces of arytenoid cc.
Intermembranous part of rima glottidis is located between?
Vocal folds
Vocal folds extend from ? to ?
Vocal process of arytenoid c. to thyroid c.
Vocal folds located?
Cd. to laryngeal ventricle
Infraglottic cavity extends from ? to ?
Glottic cleft to beginning of trachea
Infraglottic cavity is wide on which side?
Dorsally > narrow
infraglottic cavity is entirely contained within?
Cricoid c.
2 major ligs. of larynx
- Cricotracheal lig.
2. Cricothyroid lig.
4 extrinsic mm. of larynx
- Thyrohyoideus m.
- Sternothyroideus m.
- Thyropharyngeus m.
- Cricopharyngeus m.
Extrinsic mm. connect?
Larynx with hyoid b., pharynx and sternum
Intrinsic mm. of larynx
Pass from one c. to another and move them in relation to each other
Function of intrinsic mm. of larynx
- Widen and narrow glottic cleft
2. Tens and relax vocal fold
Cricothyroideus m. action and innervation
A: tense vocal fold
I: cr. laryngeal n.
Cricoarytenoideus dorsalis m. action and innervation
A: main abductor of arytenoid c.
I: cd. laryngeal n.
Cr. laryngeal n. only innervates?
Cricothyroideus m.
Cricoarytenoideus lateralis m. action and innervation
A: closes glottic cleft
I: cd. laryngeal n.
Thyroarytenoideus m. action and innervation
A: relax vocal fold, constrict glottis
I: cd. laryngeal n.
Thyroarytenoideus m. is divided into?
Ventricularis and vocalis mm.
Ventricularis m.
Rostral division, constricts glottis and dilates laryngeal saccule
Vocalis m.
Medial division, lies inside vocal fold with vocal lig. and draws arytenoid c. (to relax vocal fold)
Arytenoideus transversus m. action and innervation
A: constrict glottis
I: cd. laryngeal n.
Cd. laryngeal n. innervates?
- Cricoarytenoideus m. (dorsalis and lateralis)
- Thyroartenoideus m.
- Arytenoideus transversus m.
All intrinsic mm. of larynx except cricothyroid m.
Blood supply of larynx
Cr. laryngeal a.
Cr. laryngeal a. is a drect branch from?
External carotid a.
Cr. laryngeal a. runs ventrally with?
Cr. laryngeal n.
Cr. laryngeal a. supplies?
Most of the mucosa and intrinsic mm. of larynx
Larynx is innervated by brahces of?
Vagus n. (cr. laryngeal and cd. laryngeal)
Cr. laryngeal n. leaves vagus at level of?
Distal ganglion of vagus (nodose ggl.)
Branches of cr. laryngeal n.
External and internal branches
External br. of cr. laryngeal n. innervates?
Cricothyroid m.
Internal b. of cr. laryngeal n. innervates?
Mucosa
Cd. laryngeal n. is the terminal segment of?
Recurrent laryngeal n.