Cricothyroid muscle
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| Cricothyroid muscle | ||
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| Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. | ||
| Latin | musculus cricothyroideus | |
| Gray's | subject #236 1081 | |
| Origin: | Anterior and Lateral Cricoid Cartilage | |
| Insertion: | Inferior Cornu and Lamina of the Thyroid Cartilage | |
| Artery: | ||
| Nerve: | external laryngeal branch of the vagus | |
| Action: | ||
| Dorlands/Elsevier | m_22/12548712 | |
The cricothyroid muscle attaches to the anterolateral aspect of the cricoid and the inferior cornu and lower lamina of the thyroid cartilage, tilting the thyroid forwards and tensing the vocal cords.
It's the only laryngeal muscle supplied by the external laryngeal nerve (rather than the recurrent laryngeal nerve).
Contents |
[edit] Action
The Cricothyreoidei produce tension and elongation of the vocal folds by drawing up the arch of the cricoid cartilage and tilting back the upper border of its lamina; the distance between the vocal processes and the angle of the thyroid is thus increased, and the folds are consequently elongated.
[edit] Innervation
This muscle is innervated by the external laryngeal branch of the vagus nerve.
[edit] Additional images
 The veins of the thyroid gland. |
 The fascia and middle thyroid veins. |
 Side view of the larynx, showing muscular attachments. |
[edit] See also
[edit] External links
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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
