The posterior surface of the lamina is characterized by two shallow oval depressions separated by a vertical ridge. The esophagus is attached to the ridge and the depressions are for attachment of the posterior crico-arytenoid muscles.
The cricoid cartilage has two articular facets on each side for articulation with other laryngeal cartilages:
One facet is on the sloping superolateral surface of the lamina and articulates with the base of an arytenoid cartilage.