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The carina is a cartilaginous ridge separating the left and right main bronchi that is formed by the inferior-ward and posterior-ward prolongation of the inferior-most tracheal cartilage. [2] The carina occurs at the lower end of the trachea - usually at the level of the 4th to 5th thoracic vertebra.
The sternal angle is used in the definition of the thoracic plane. [citation needed] The angle also marks the level of a number of features: Boundary between the superior and inferior portion of the mediastinum [citation needed] Passage of the thoracic duct from right to left behind esophagus [citation needed] Tracheal bifurcation.
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{{Bone and cartilage | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Bone and cartilage | state = expanded}} will show the template expanded, i.e. fully visible. This template is a navigation box relating to anatomy that provides links to related topics. When editing the links in this template:
Diagram of cartilage cells called chondroblasts. Date: 30 July 2014 (released by CRUK) Source: Original email from CRUK: Author: Cancer Research UK: Permission (Reusing this file) This image has been released as part of an open knowledge project by Cancer Research UK. If re-used, attribute to Cancer Research UK / Wikimedia Commons
Keel (bird anatomy), or carina, an extension of the sternum in some birds Carina of trachea , the point at which the trachea branches to form the two mainstem bronchi Carinae, in dinosaur anatomy , enameled ridges on the cutting edges of the teeth
A keel or carina (pl.: carinae) in bird anatomy is an extension of the sternum (breastbone) which runs axially along the midline of the sternum and extends outward, perpendicular to the plane of the ribs. The keel provides an anchor to which a bird's wing muscles attach, thereby providing adequate leverage for flight.
Lamina is a general anatomical term meaning "plate" or "layer". [1] It is used in both gross anatomy and microscopic anatomy to describe structures.. Some examples include: The laminae of the thyroid cartilage: two leaf-like plates of cartilage that make up the walls of the structure.