Larynx Flashcards
Attachments of lower border of thyroid C.
Cricothyroid
Attachments of posterior border of thyroid C.
- Stylopharyngeus
- Salpingopharyngeus
- Palatopharyngeus
Attachments of oblique line of thyroid C.
- Sternothyroid
- Thyrohyoid
- Thyropharyngeus
Attachments of inner aspect of thyroid C.
- Median thyroepiglottic ligament
- Thyroepiglottic M
- Vestibular folds
- Vocal folds
- Thyroarytenoid M
- Vocalis
Attachments of epiglottis
- Aryepiglottic folds
- Median glossoepiglottic fold
- Hyoepiglottic ligament
- Aryepiglottic M
- Thyroepiglottic M
Attachments of arytenoid cartilage
Vocal process - vocal folds, vocalis
Muscular process - lateral and posterior cricoarytenoid
Posterior surface - transverse arytenoid, oblique arytenoid
Cricothyroid action
- tuning fork of larynx
- tensor of vocal cords
Posterior cricoarytenoid action
Abductor of vocal cords
Safety muscle
Lateral cricoarytenoid action
Adductor of vocal cords
Transverse arytenoid
Adductor of vocal cords
Oblique arytenoids
Adductor of vocal cords
Aryepiglottic
Closing inlet of larynx
Thyroarytenoid action
Relaxing vocal cords
Thyroepiglottic action
Opening inlet of larynx
Vocalis
Relaxing vocal cords
Elevation of larynx
Thyrohyoid
Mylohyoid
Depression of larynx
Sternothyroid
Sternohyoid
Adductors of vocal cords
Lateral cricoarytenoid
Transverse and oblique arytenoids
Relaxors of vocal cords
Vocalis
Thyroarytenoid
Motor nerve supply of intrinsic muscles of larynx
Cricothyroid - external laryngeal nerve
All others - recurrent laryngeal nerve
Blood supply upto vocal folds
- superior laryngeal branch of superior thyroid artery
- superior laryngeal vein drains into superior thyroid vein
Blood supply below vocal folds
- Inferior laryngeal branch of inferior thyroid artery
- inferior laryngeal vein drains into inferior thyroid vein
Sensory nerve supply
Internal laryngeal - mucous membrane upto vocal folds
Recurrent laryngeal - below vocal folds
Lymphatic drainage
Above vocal folds - superior thyroid vessels
Below vocal folds - deep cervical
Rima glottitis during quiet breathing
Pentagonal
RG during speech/phonation
Reduced to chink
RG during forced inspiration
diamond shaped
RG during whispering
Funnel shaped