Lab 4: Special Senses (Eye and Ear)
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A. Histology of Eye
1. Slide #24B (retina)
Find – ganglion cell fiber layer ---
ganglion cell layer --- inner synaptic layer
(inner plexiform layer) --- bipolar cell
layer (inner nuclear layer) --- outer synaptic layer (outer plexiform layer) ---
photoreceptor layer (outer nuclear layer) --- outer limiting layer --- rods and
cones --- pigmented epithelium (layer) --- choroid layer.
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B. Models of Eye
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1. Model of eye without surrounding
structures
Find – sclera --- cornea --- iris ---
pupil --- ciliary body (with cilary process and ciliary muscle) --- suspensory ligament
--- lens --- choroid layer --- retina --- ora serrata --- lacrimal gland ---
macula lutea --- optic nerve --- retinal vein and artery --- posterior cavity
(contains vitreous body) --- anterior cavity (contains aqueous humor).
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2.
Model of eye with surrounding structures,
unopened eye,
rear of
opened eye,
front of
opened eye
In addition to the above find – medial,
lateral, superior and inferior rectus muscles --- superior and inferior oblique
muscles --- conjunctiva (palpebral and bulbar) --- palpebrae --- tarsal
(Meibomian) glands --- lacrimal gland --- inferior and superior lacrimal canals
--- lacrimal sacs --- nasolacrimal duct --- tarsal plate.
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C. Other Models of Ear
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1. Model of whole ear
Video:
Whole Ear Model
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Find – auricle or pinna (with helix and
lobule) --- external auditory meatus --- temporal bone --- tympanic membrane
(eardrum) --- ossicles (malleus, incus, stapes) --- internal auditory meatus ---
vestibulocochlear nerve VIII (cochlear and vestibular branch) --- auditory
(Eustachian or pharyngotympanic) tube --- external ear --- middle ear ---
internal ear --- semicircular canals (superior, posterior, lateral) --- tensor
tympani --- stapedius (if present).
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2. Model of bony labyrinth
(lateral
view,
medial
view,
anterior
view, inferior
view)
Videos:
Cochlea;
Vestibule;
Semicircular Canals
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Find – semicircular canals (superior or
anterior, posterior, and lateral) --- bony labyrinth with perilymph (pink) ---
membranous labyrinth with endolymph (grey) --- ampulla of semicircular canal ---
utricle --- saccule --- vestibule --- cochlea (shaped like a snail shell) ---
cochlear duct (scala media) --- round window (secondary tympanic membrane) ---
oval window --- vestibulocochlear nerve (VIII) with cochlear and vestibular
branches --- vestibular duct (scala vestibuli) --- tympanic duct (scala tympani)
--- spiral organ (organ of Corti) --- modiolus.
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D. Histology of Cochlea
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1. Slide #25B
(cochlea
and
spiral organ)
Find – spiral ganglia --- cochlear duct (scala
media) --- vestibular duct (scala vestibuli) --- vestibular membrane ---
tympanic duct (scala tympani) --- basilar membrane --- spiral organ (organ of
Corti) --- tectorial membrane --- hair cells --- helicotrema where the two ducts
meet (if present).
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2.
Model of cochlea
Video:
Cochlear Model
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Find – spiral ganglia --- cochlear duct
(scala media) --- vestibular duct (scala vestibuli) --- vestibular membrane ---
tympanic duct (scala tympani) --- basilar membrane --- modiolus --- spiral organ
(organ of Corti) --- tectoral membrane --- inner hair cell --- outer hair cells
--- auditory (cochlear) nerve. Know which chambers contain perilymph and
endolymph. |
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