Lab 4: Special Senses (Eye and Ear)     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.     B. Models of Eye     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).     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.     C. Other Models of Ear     1. Model of whole ear    Video: Whole Ear Model      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).     2. Model of bony labyrinth (lateral view, medial view, anterior view, inferior view)    Videos: Cochlea; Vestibule; Semicircular Canals      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.     D. Histology of Cochlea     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).     2. Model of cochlea    Video: Cochlear Model      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.