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Cricothyroideus

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Abstract

The right and left cricothyroid may cross the midline and interdigitate before inserting onto the cricoid cartilage. A very small band of muscle may be found on the inferior lateral aspect of the thyroid cartilage. It does not have any association with the cricoid, hence its function in this location is difficult to understand. It has, however, the elegant name of incisurae mediae obliquus (Gruber), and it may be found unilaterally or bilaterally.

The right and left cricothyroid may cross the midline and interdigitate before inserting onto the cricoid cartilage. A very small band of muscle may be found on the inferior lateral aspect of the thyroid cartilage. It does not have any association with the cricoid, hence its function in this location is difficult to understand. It has, however, the elegant name of incisurae mediae obliquus (Gruber), and it may be found unilaterally or bilaterally.

Another small muscle, depressor thyroideae, arises from the lower border of the first tracheal ring and passes vertically upward, over the cricoid muscle to be inserted into the lower border of the thyroid cartilage. An associated muscle band is keratocricoideus, a stout small band that extends at an angle, from the lateral inferior border of the thyroid cartilage, to the medial inferior border of the cricoid cartilage.

Image of varieties of muscle associated with the cricoid and thyroid cartilages

Varieties of Muscle Associated with the Cricoid and Thyroid Cartilages

  • Muscles Thyroidei Marginales Inferior: Incisurae Mediae Obliquus, B1 a unpaired, b unusual course of cricothyroidei; B2 a unpaired, left side, Incisurae Mediae Obliquus Bicaudatus, alpha, supernumerary inferior bundle of the same muscle, beta, unusual bundle of right thyrohyoid muscle; B3 a,a paired Incisurae Mediae Obliquus; C a Keratoarytenoideus; D a Thyrotrachealis Biceps, b c d Levator Glandulae Thyroideae; A a Ligamentum hyothyroideum accessorium.

from Gruber, 1868a, b, c, d. — Anatomy Atlases. Immagine ospitata dal sito d’origine. Apri la pagina originale.

Image of depressor thyroideae and keratocricoideus

Depressor Thyroideae (near midline) and Keratocricoideus (angulated muscle)

from Bradley — Anatomy Atlases. Immagine ospitata dal sito d’origine. Apri la pagina originale.

Riferimenti dell’opera originale

Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.

  • Anson, B.J., Ed. (1966) Morris' Human Anatomy, 12th ed., The Blakiston Division, McGraw-Hill BooK Company, New York.
  • Bradley, S.M. (1872) Notes on myological pecularities. J. Anat. Physiol. 6:420-421.
  • Gruber, W. (1868a) Über das Zungenbein- Schildknorpel-Hilfs- band (Ligamentum hyothyreoideum accessorium). Arch. Anat. Physiol. Wissen. Med. 1868:633-634.
  • Gruber, W. (1868b) Über die Muskeln des unteren Schildknorpelrandes- Musculi thyroidei marginales inferiores. Arch. Anat. Physiol. Wissen. Med. 1868:635-639.
  • Gruber, W. (1868c) Über den seltenen Schildknorpelhorn- Giessbeckenknorpelmuskel (Musculus kerato-arytenoideus). Arch. Anat. Physiol. Wissen. Med. 1868:640-641.
  • Gruber, W. (1868d) Über eine neue Variante des Musculus thyreotrachealis und über den Musculus hyo-trachealis. Arch. Anat. Physiol. Wissen. Med. 1868:642-645.
  • Macalister, A. (1875) Additional observations on muscular anomalies in human anatomy (third series), with a catalogue of the principal muscular variations hitherto published. Trans. Roy. Irish Acad. Sci. 25:1-134.
  • Williams, P.L., Warwick, R., Dyson, M., and L.H. Bannister., Eds. (1989) Gray's Anatomy,37th ed. Churchill Livingstone, Edinburgh.

Classificazione anatomica

Sistemi:
Sistema muscolare

Provenienza del contenuto

Adattamento

Adattamento di «Cricothyroideus — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» di Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Fonte: https://www.anatomyatlases.org/AnatomicVariants/MuscularSystem/Text/C/48Cricothyroideus.shtml Opera originale distribuita con licenza CC BY-NC-SA 4.0 (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adattamento a cura di Redazione AIVA. Modifiche rispetto all’originale: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. Questa pubblicazione non è approvata né avallata dagli autori dell’opera originale.

Licenza

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