1. HISTOLOGY REVIEW Eye and Ear

2. Structures of the eye
Eyeball (anterior) – section – H&E – 4x objective
conjunctiva
posterior cavity
ciliary body
ciliary processes
posterior chamber
cornea
iris
anterior chamber
lens
The dashed lines indicate the locations of the suspensory ligaments connecting the ciliary processes to the capsule around the perimeter of the lens.

3. Structures of the eye
Eyeball (anterior) – section – H&E – 4x objective
conjunctiva
iris
cornea
pupil
lens
anterior chamber
The dashed line indicates the location of the pupil, located between the anterior-most margins of the iris.

4. Structures of the eye
Eyeball (posterior) – section – H&E – 10x objective
retina
choroid
sclera
posterior cavity
The brown-black pigments of the choroid are melanin granules. Go back to the previous two slides and follow this pigment into the iris.

5. Structures of the eye
Retina – section – H&E – 40x objective
pigmented epithelium
choroid
layer of rods and cones
outer nuclear layer
outer plexiform layer
inner nuclear layer
inner plexiform layer
ganglion cell layer
optic nerve fibers
Plexiform layers are areas of synapses between adjacent neuronal types.

6. petrous portion of the temporal bone
Structures of the ear
Cochlea – longitudinal section – H&E – 4x objective
petrous portion of the temporal bone
bony cochlea
modiolus
vestibule
The cochlea is a coiled structure, turning 2.75 times about a central axis (the modiolus). So, you see the same tube multiple times in the same structure.

7. Structures of the ear
Cochlea – longitudinal section – H&E – 10x objective
scala vestibuli
scala media (cochlear duct)
vestibular membrane
spiral organ of Corti
tectorial membrane (torn free)
basilar membrane
scala tympani
spiral ganglion
During histological processing the delicate tectorial membrane breaks free from its attachment and curls back on itself.

8. scala media (cochlear duct)
Structures of the ear
Cochlea – longitudinal section – H&E – 40x objective
scala vestibuli
scala media (cochlear duct)
vestibular membrane
spiral organ of Corti
tectorial membrane
basilar membrane
scala tympani
The spiral organ consists of hair cells, the stereocilia of which are embedded in the overlying tectorial membrane, and support cells.
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