Posterior cricoarytenoid muscle
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| Posterior cricoarytenoid | ||
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| Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. | ||
| Latin | musculus cricoarytenoideus posterior | |
| Gray's | subject #236 1082 | |
| Origin: | posterior part of the cricoid | |
| Insertion: | muscular process of the arytenoid cartilage | |
| Artery: | ||
| Nerve: | recurrent laryngeal branch of the vagus | |
| Action: | abducts and laterally rotates the cartilage, pulling the vocal ligaments away from the midline and forward and so opening the rima glottidis | |
| Antagonist: | Lateral cricoarytenoid muscle | |
| Dorlands/Elsevier | m_22/12548696 | |
The posterior cricoarytenoid muscles are extremely small, paired muscles that extend from the posterior cricoid cartilage to the arytenoid cartilages in the larynx. By rotating the arytenoid cartilages laterally, these muscles abduct the vocal cords and thereby open the rima glottidis. Their action opposes the lateral cricoarytenoid muscles. The posterior cricoarytenoid muscles receive innervation from the recurrent laryngeal branch of the vagus nerve (CN X).
[edit] Additional images
 The cartilages of the larynx. Posterior view. |
 Muscles of larynx. Posterior view. |
 Muscles of the larynx, seen from above. |
 Dissection of the muscles of the palate from behind. |
[edit] External links
- LUC pcay
- Atlas of anatomy at UMich rsa4p2
- Dictionary at eMedicine posterior+cricoarytenoid+muscle
- Norman/Georgetown lesson11 (larynxmuscles)
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scalp/eyelid: occipitofrontalis (occipitalis, frontalis) - orbicularis oculi - corrugator supercilii - depressor supercilii
extraocular: levator palpebrae superioris - superior tarsal - rectus (superior, inferior, medial, lateral) - oblique (superior, inferior) - intraocular: ciliary - iris dilator - iris sphincter
ear: auriculares - temporoparietalis - stapedius - tensor tympani
nose: procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi
mouth: levator anguli oris/depressor anguli oris - levator labii superioris/depressor labii inferioris - zygomaticus (major, minor) - mentalis - buccinator - orbicularis oris - risorius
mastication: masseter - temporalis - pterygoid (lateral, medial)
tongue: extrinsic (genioglossus - hyoglossus - chondroglossus - styloglossus) intrinsic (superior longitudinal - inferior longitudinal - transversus - verticalis)
soft palate: levator veli palatini - tensor veli palatini - musculus uvulae - palatoglossus - palatopharyngeus
pharynx: pharyngeal constrictor (inferior, middle, superior) - stylopharyngeus - salpingopharyngeus
larynx: cricothyroid - posterior cricoarytenoid - lateral cricoarytenoid - arytenoid - thyroarytenoid
