HISTOLOGY REVIEW Eye and Ear Structures of the

Structures of the eye Eyeball (anterior) – section – H&E – 4 x objective

Structures of the eye Eyeball (posterior) – section – H&E – 10 x objective

Structures of the eye Retina – section – H&E – 40 x objective pigmented

Structures of the ear Cochlea – longitudinal section – H&E – 4 x objective

Structures of the ear Cochlea – longitudinal section – H&E – 10 x objective

Structures of the ear Cochlea – longitudinal section – H&E – 40 x objective

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HISTOLOGY REVIEW Eye and Ear

Structures of the eye Eyeball (anterior) – section – H&E – 4 x 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.

Structures of the eye Eyeball (anterior) – section – H&E – 4 x 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.

Structures of the eye Eyeball (posterior) – section – H&E – 10 x 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.

Structures of the eye Retina – section – H&E – 40 x 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 areas of synapses between adjacent neuronal types.

Structures of the ear Cochlea – longitudinal section – H&E – 4 x 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.

Structures of the ear Cochlea – longitudinal section – H&E – 10 x objective scala vestibuli scala media (cochlear duct) spiral organ of Corti vestibular membrane 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.

Structures of the ear Cochlea – longitudinal section – H&E – 40 x objective scala vestibuli scala media (cochlear duct) spiral organ of Corti vestibular membrane 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. end