histology review eye and ear dr. tim ballard department of biology and marine biology
TRANSCRIPT
HISTOLOGY REVIEWEye and Ear
Dr. Tim BallardDepartment of Biology and Marine Biology
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 eyeStructures of the eye
Eyeball (anterior) – section – H&E – 4x objective
cornea
ciliary processe
s
anterior chamber
lens
posterior chamber
posterior cavityciliary
body
conjunctiva
iris
The dashed line indicates the location of the pupil, located between the anterior-most margins of the iris.
Structures of the eyeStructures of the eye
Eyeball (anterior) – section – H&E – 4x objective
cornea
anterior chamber
lens
conjunctiva
iris
pupil
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 eyeStructures of the eye
Eyeball (posterior) – section – H&E – 10x objective
choroid
posterior cavity
retina
sclera
Plexiform layers are areas of synapses between adjacent neuronal types.
Structures of the eyeStructures of the eye
Retina – section – H&E – 40x objective
outer nuclear layer
optic nerve fibers
choroidpigmented epithelium
ganglion cell layer
layer of rods and cones
outer plexiform layer
inner nuclear layer
inner plexiform
layer
Cochlea – longitudinal section – H&E – 4x objective
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 earStructures of the ear
bony cochlea
vestibule
modiolus
petrous portion of the temporal
bone
Cochlea – longitudinal section – H&E – 10x objective
During histological processing the delicate tectorial membrane breaks free from its attachment and curls back on itself.
Structures of the earStructures of the ear
spiral ganglio
n
scala tympani
basilar membrane
spiral organ of
Corti
vestibular membrane
scala media (cochlear duct)
scala vestibuli
tectorial membrane (torn free)
Cochlea – longitudinal section – H&E – 40x objective
The spiral organ consists of hair cells, the stereocilia of which are embedded in the overlying tectorial membrane, and support cells.
Structures of the earStructures of the ear
scala tympani
basilar membrane
spiral organ of
Corti
vestibular membran
e
scala media (cochlear duct)
scala vestibuli
tectorial membrane
end