Question at position 11 Name the structures designated by the letters below: C – D – Prompt 1DAnswer for prompt 1 D[input]Prompt 2CAnswer for prompt 2 C[input]Possible answersTectorial membraneVestibular membraneHair cellsSupporting cellsBasilar membrane

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First, let's restate the task and the available options to ensure clarity.
Question (fill-in multiple blanks): Name the structures designated by the letters below: C – D – … Options: Tectorial membrane, Vestibular membrane, Hair cells, Supporting cells, Basilar membrane. The provided correct answers are Tectorial membrane and Hair cells, corresponding to the blanks for letters C and D in the diagram.
Option-by-option analysis:
Option 1: Tectorial membrane
- This structure is a key component of the organ of Corti in the cochlea. It lies above the hair cells and interacts with their tallest stereocilia during sound transduction. If the letter C points to this membrane, it fits the known anatomy where the tectorial membrane overlaps the hair cell stereocilia, enabling deflections that trigger receptor potentials. Therefore, this option is consistent with the expected labeling for C in the cochlear cross-section.

Option 2: Vestibular membrane
- Also called Reissner’s membrane, this structure forms the upper boundary of the scala media (cochlear duct). It is not the structure typically labeled at C or D in standard organ-of-Corti diagrams, since the vestibular membrane lies more peripherally and does not directly interact with the hair cells for mechanoelectrical transduction. This makes it an unlikely match for the C or D labels in this context.

Option 3: Hair cells
- Hair cells are the sensory receptors (inner and outer) of the cochlea responsible for converting mechanical vibrations into neural signals. They are located within the organ of Corti, aligned against the tectorial membrane. If the letter D corresponds to the cell bodies of the sensory receptors, or more specifically to their apical hair bundles, labeling D as hair cells aligns with standard anatomical diagrams. This makes Hair cells a plausible and correct match for the second blank (D).

Option 4: Supporting cells
- Supporting cells provide structural and metabolic support to hair cells within the organ of Corti. They are present in the same region but are not the primary sensory elements. Since the prompt asks for the structures designated by C and D, and the provided answers indicate a sensory structure, this option is less consistent with the expected labels for the blanks in this particular diagram.

Option 5: Basilar membrane
- The basilar membrane forms the foundation of the organ of Corti and supports the hair cells, translating fluid motion into mechanical displacement. While essential to cochlear mechanics, it is not typically labeled as C or D in a diagram emphasizing the interactions between the tectorial membrane and hair cells. Thus, it is unlikely to be the correct match for either blank here.

Summary of reasoning for the given correct answers:
- Tectorial membrane matches blank C due to its location above the hair cells and its role in stimulating hair cell deflection.
- Hair cells match blank D as the primary sensory structures that respond to mechanical stimulation from the basilar membrane and tectorial membrane interaction.

If you needed to verify, you would check the spatial relationships in a standard cochlear cross-section: the tectorial membrane sits atop the hair cell stereocilia, which aligns with the chosen C and D labels. The vestibular membrane sits elsewhere at the cochlear duct boundary, the basilar membrane under the organ of Corti, and the supporting cells are adjacent to hair cells but not the primary sensory targets highlighted by these prompts.

Question at position 11 Name the structures designated by the letters below: C – D – Prompt 1DAnswer for prompt 1 D[input]Prompt 2CAnswer for prompt 2 C[input]Possible answersTectorial membraneVestibular membraneHair cellsSupporting cellsBasilar membrane

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