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crista
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Diagram showing the physiology of balance with two main parts: at left, a cross-section of the crista in the horizontal canal with labeled hair bundles, hair cells, and cupula above a stationary person; at right, the same structures during head rotation above a spinning person, illustrating how the cupula shifts to detect movement. Diagram of the human vestibular system showing the membranous labyrinth with labeled structures for balance: the cristae in the semicircular ducts and the maculae in the utricle and saccule. Insets detail the crista with hair cells and cupula, and the macula with hair cells, otolithic membrane, and supporting structures.
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crista

anatomy
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Diagram showing the physiology of balance with two main parts: at left, a cross-section of the crista in the horizontal canal with labeled hair bundles, hair cells, and cupula above a stationary person; at right, the same structures during head rotation above a spinning person, illustrating how the cupula shifts to detect movement.
sensory organs of balance; human ear The cristae of the semicircular ducts, which form one of the two sensory organs of balance (the second being the maculae of the utricle and saccule), respond to rotational movements and are involved in dynamic equilibrium.

The term "crista" has multiple meanings depending on the context. In anatomy, it can refer to:

  • Mitochondrial Cristae: These are inwardly projecting folds of the inner membrane within a mitochondrion. They significantly increase the surface area of the membrane, which is crucial for energy production through oxidation and reduction reactions. Mitochondria are vital organelles found in both plant and animal cells, often called the "powerhouses" of the cell because they generate adenosine triphosphate (ATP), the cell's energy currency.12

  • Crista Galli: This is a bony crest located in the midline of the anterior cranial fossa of the skull. It serves as a point of attachment for the falx cerebri, a fold of dura mater that separates the two cerebral hemispheres.3

  • Crista Ampullaris: This is a sensory organ located in the ampullae of the semicircular canals in the inner ear. It contains specialized neuroepithelial hair cells that are involved in detecting rotational movement and maintaining balance. This structure is also referred to as a "crista acustica".45

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
5 Britannica Sources
  1. crista
  2. cell - Mitochondrial and chloroplastic structure
  3. human ear - Semicircular canals
  4. human skeleton - Interior of the cranium
  5. crista acustica

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