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The carina occurs at the lower end of the trachea - usually at the level of the 4th to 5th thoracic vertebra. [3] [4] This is in line with the sternal angle, but the carina may raise or descend up to two vertebrae higher or lower with breathing. The carina lies to the left of the midline, and runs antero-posteriorly (front to back). [citation ...
A small, freely-moving projection on the anterior edge of the wing of modern birds (and a few non-avian dinosaurs)—a bird's "thumb"—the word is Latin and means 'winglet'; it is the diminutive of ala, meaning 'wing'. Alula typically bear three to five small flight feathers, with the exact number depending on the species.
The carina is margined below by a broad, shallow, round furrow, which is defined on its inner side by a sharp spiral thread. The umbilicus is defined by a sharp thread, outside of which is a shallow furrow and two or three more spiral threads. The centre of the base is nearly smooth, but has also some feeble spirals, which increase in strength ...
Carina Rugby League Football Club; Toyota Carina, an automobile; USS Carina, a 1942 United States Navy cargo ship used in World War II; Sailing yacht Carina, which disappeared off the Dublin coast in 1944; Sailing yacht Carina II, which won the 1955 and 1957 Fastnet Races skippered by USA sailor Richard Nye
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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.
Image source: Getty Images. Social Security's earnings test limits also rose in 2025. This year, seniors who work and collect benefits will be able to earn more money without risking having a ...
From ancient history to the modern day, the clitoris has been discredited, dismissed and deleted -- and women's pleasure has often been left out of the conversation entirely. Now, an underground art movement led by artist Sophia Wallace is emerging across the globe to challenge the lies, question the myths and rewrite the rules around sex and the female body.