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.