In-Depth Notes on Human Eye Anatomy and the Ear

Sclera: Protection and structural support.

Cornea: Refracts light, provides sensitivity, nourishment, hydration.

Iris: Regulates light intake, protects from excessive exposure.

Pupil: Controls light entry based on conditions.

Ciliary Body: Involved in focusing vision, supports the lens, supplies blood to the eye.

Lens: Bends light to form clear images.

Choroid: Supplies nutrients and absorbs excess light.

Retina: Converts light into electrical signals for vision.

Vitreous and Aqueous Humor: Maintain shape and pressure; provide nutrients.

Optic Nerve: Transmits visual information to the brain.

Eyelashes/Eyelid: Protect against foreign elements.

Conjunctiva: Lubricates, protects, and assists in tear secretion.

Extrinsic Eye Muscles: Control eye movement.

Optic Disc: Blind spot where the optic nerve exits the eye.

Macula Lutea: Responsible for detailed vision.

Fovea Centralis: Sharp central vision.

Photoreceptors: Convert light into nerve impulses (rods for light, cones for color).

Bipolar Cells: Transmit signals from photoreceptors to ganglion cells.

Ganglion Cells: Process and transmit visual information.

Auricle/Pinna: Collects sound waves.

External Acoustic Meatus: Funnels sound to the eardrum.

Tympanic Membrane: Vibrates with sound, transmits to ossicles.

Ossicles: Amplify sound vibrations.

Pharyngotympanic Tube: Aerates and drains the middle ear.

Oval Window: Connects middle ear to the inner ear.

Bony Labyrinth: Houses hearing and balance structures.

Cochlea: Converts sound waves into neural signals.

Vestibule: Maintains balance.

Semicircular Canals: Detect head rotation for balance.

Spiral Organ: Converts vibrations into neural signals.

Hair Cells: Sensory receptors critical for hearing and balance.