SENSORY ORGANS Organ of vision, organ of balance and hearing and accessory organs Organ of vision ➢Eyeball (bulbus oculi) - anterior segment of eye - posterior segment of eye ➢Eyelid (palpebra) ➢Tear gland (gl. lacrimalis) Anterior segment Posterior segment anterior cornea iris pars caeca segment corpus ciliare retinae posterior sclera choroidea pars optica segment retinae The wall of eyeball Tunica externa (fibrosa) Tunica media (vasculosa) Tunica interna (nervosa) Anterior segment of eye iris corpus ciliare sclera cornea Anterior segment of eye – cornea Anterior segment of eye – corpus ciliare Anterior segment of eye – iris [pink strip] dorsal epithelium stroma iridis posterior epithelium of cornea anterior epithelium of iris Dorsal segment of eye retina choroidea sclera lamina chorocapillaris - with capillaries lamina vasculosa - with vessels lamina vitrea lamina suprachoroidea Posterior segment of eye – choroidea choroidea membrana limitans interna layer of nerve fibers layer of ganglionic cells inner plexiform layer inner granular layer outer plexiform layer outer granular layer membrana limitans externa layer of rods and cones pigmented epithelium (stratum pigmenti retinae) Posterior segment of eye – retina Palpebra ventral side (skin) eyelash dorsal side (conjunctiva) Palpebra – conjunctival side stratified columnar epithelium goblet cells Glandula lacrimalis Organ of balance and hearing ➢ Outer ear auricle (auricula) auditory meatus (meatus acusticus ext.) ear drum (membrana tympani) ➢ Middle ear tympanic cavity (cavum tympani) ➢ Inner ear sacculus – macula sacculi utriculus – macula utriculi ductus semicirculares – cristae ampullares ductus cochlearis – organon Corti Inner ear (in pyramid of ossis petrosum ossis temporalis) Bony labyrinth 1) vestibulum 2) canales semicirculares 3) cochlea Membranous labyrinth pars statica (1, 2) pars akustica (3) 1) sacculus utriculus saccus endolymphaticus 2) ductus semicirculares 3) ductus cochlearis endolymph perilymphatic space spatium perilymphaceum organ of Corti Cochlea – organ of Corti hair cells inner outer inner phalangeal columnes outer phalangeal cells cells of Corti cells of Hensen Auricle (auricula) Elastic cartilage Ear lobule SENSORY ORGANS Slides: 88. Anterior segment of the eye 89. Posterior segment of the eye 90. Fasciculus opticus 91. Palpebra 92. Gl. lacrimalis 93. Ductus cochlearis 94. Auricula Development of eye diencephalon 3rd brain ventricle Development of eye ectoderm mesenchyme lens placode optic cup stalk of optic cup intraretinal space of optic cup Development of optic cup and lens outer layer of cup intraretinal space inner layer of cup stalk of optic cup lumen of stalk of optic cup lens vesicle ectoderm neuroectoderm (wall of diencepalon) intraretinal space diencephalon wall lens vesicle lumen of stalk of optic cup anterior epithelium of lens ectoderm eyelid pigmented layer of retina nervous layer of retina intraretinal space mesenchyme + retinal pigmented layer retinal nervous layer camera oculi ant. eyelid ectoderm conjunctival sac mesenchyme Development of inner ear otic placode mesenchyme ectoderm otic pit dorsal aorta otic pit wall of rhombencephalon otocyst the 1st ectodermal cleft Development of membranous labyrinth utricular part of otocyst saccular part of otocyst tubular process of sacculus *central regions of developing semicircular canals *these regions perforate later Development of semicircular canals Development of middle ear Meckel‘s cartilage rhombencephalon utriculus sacculus 1st ectodermal cleft middle ear ossicles wall of inner ear primitive cavum tympani wall of inner ear Development of external ear the 1st ectodermal cleft basis of eye auricular tubercles