The oblique arytenoid fibres cross between the two arytenoids in an X-pattern, adducting the arytenoids to close the posterior glottis. Some fibres continue superiorly as the aryepiglotticus muscle.
| Origin | Muscular process of one arytenoid cartilage |
|---|---|
| Insertion | Apex of the opposite arytenoid — crossing the midline |
| Nerve Supply | Recurrent laryngeal nerve (CN X) |
| Blood Supply | Laryngeal branch of inferior thyroid artery |
| Actions | Adducts the arytenoid cartilages — closes the posterior glottis; Some fibres continue as the aryepiglotticus |
|---|
The oblique arytenoid fibres produce the posterior glottic seal critical for preventing aspiration. In posterior laryngeal cleft repair, the oblique arytenoid fibres are reconstructed to close the posterior glottis. Their function is assessed by laryngoscopy during phonation — incomplete closure (posterior glottic gap) indicates arytenoid paresis.
Not externally palpable — assessed by laryngoscopy.
Incomplete posterior glottic closure from oblique arytenoid fibre weakness producing a characteristic posterior gap on phonation and aspiration risk.
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