Bat skull, X-ray: note the developed organs of the inner ear used for echolocation; on either side of the base of this bat skull are large coiled cochlea, the organs of hearing.
Inner ear hair cells. Coloured scanning electron micrograph (SEM) of sensory hair cells from the organ of Corti, in the cochlea of a mammalian inner ear. Each V-shaped arrangement of hairs lies on the top of a single cell.
Retinoblastoma filling the vitreous cavity
Astrocytoma of the optic nerve
![Sex-specific (male) visual neurons in blowfly (100x) [source]](http://24.media.tumblr.com/tumblr_lhmyw7Uu3P1qa6reco1_400.jpg)
Sex-specific (male) visual neurons in blowfly (100x) [source]
![Retina. Coloured scanning electron micrograph (SEM) of a resin cast of the retina. Blood vessels (red, purple) radiate out from the optic disc (yellow). The optic disc is the area where the optic nerve and blood vessels enter the eye. Due to this, it has no light-sensitive cells and is the cause of the blind spot. The cast was made by injecting resin into the blood vessels, followed by chemical digestion of the surrounding tissues. [source]](http://25.media.tumblr.com/tumblr_lh2gh1KrOa1qa6reco1_400.jpg)
Retina. Coloured scanning electron micrograph (SEM) of a resin cast of the retina. Blood vessels (red, purple) radiate out from the optic disc (yellow). The optic disc is the area where the optic nerve and blood vessels enter the eye. Due to this, it has no light-sensitive cells and is the cause of the blind spot. The cast was made by injecting resin into the blood vessels, followed by chemical digestion of the surrounding tissues. [source]
Brain, orbit, and oral cavity - lateral view
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Retina of a mouse.
This unusual image is a photomicrograph of a three-day-old zebrafish retina. This is a lateral view of the whole zebrafish eye, (analogous to looking directly into ones eye from the front). The image shows the lens in the centre surrounded by retinal stem cells in red and differentiating neurons in purple. The symmetrical nature of this image was achieved by reflecting the top half of the image across the origin. This is representative of true data as the zebrafish retina is very symmetrical photoreceptor organ.
Ear ossicles
![Human Embryo: 6 - 7 weeks
This is an approximately 6-7 week estimated gestational age 19mm embryo from conception, 8-9 weeks from LMP. Features include finger rays and cerebral hemispheres.
[Human development, on flickr]
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Human Embryo: 6 - 7 weeks
This is an approximately 6-7 week estimated gestational age 19mm embryo from conception, 8-9 weeks from LMP. Features include finger rays and cerebral hemispheres.
[Human development, on flickr]
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![Hair cell of inner ear A scanning electron microscope image of the sensory hair bundle of an inner hair cell from a guinea pig’s hearing organ in the inner ear.Vibrations made by sound cause the hairs to be moved back and forth, alternately stimulating and inhibiting the cell. When the cell is stimulated, it causes nerve impulses to form in the auditory nerve, sending messages to the brain. [source]](http://24.media.tumblr.com/tumblr_ldscihVKbi1qa6reco1_500.jpg)
Hair cell of inner ear
A scanning electron microscope image of the sensory hair bundle of an inner hair cell from a guinea pig’s hearing organ in the inner ear.
Vibrations made by sound cause the hairs to be moved back and forth, alternately stimulating and inhibiting the cell. When the cell is stimulated, it causes nerve impulses to form in the auditory nerve, sending messages to the brain. [source]
![Model of the human eardrum and the three bones of the middle ear. The malleus, incus, and stapes (auditory ossicles) are usually joined together in a chain which transmits vibrations from the eardrum to the inner ear.
[source]](http://25.media.tumblr.com/tumblr_laqpbmXBq11qa6reco1_500.jpg)
Model of the human eardrum and the three bones of the middle ear. The malleus, incus, and stapes (auditory ossicles) are usually joined together in a chain which transmits vibrations from the eardrum to the inner ear.
[source]
Auditory system
