Special senses
→ Touch. → Taste. → Hearing.
→ Smell. → Sight. → Equilibrium (balance).
THE EYE:
Sclera.
!
Vitreous chamber. Choroid.
Posterior chamber.
Iris. Fovea.
Cornea.
Lens. Retina.
Anterior chamber.
Suspensory ligaments.
·
Optic nerve.
→ Sclera: → Outer white layer that maintains the shape of the eye.
→ Muscles attached to the sclera control eye movements.
→ Choroid: → Middle layer that contains the blood vessels.
→ Cornea: → A clear, circular area in the sclera where light enters the eye.
→ Pupil: → The circular opening in the front of the choroid.
→ Iris: → Coloured smooth muscle surrounding the pupil which adjusts the size of the opening according to the brightness of light.
→ Lens: → Located behind the pupil, between the anterior & posterior chambers.
→ Is a transparent flexible by convex structure that bends or refracts light rays so they focus on the nerve cells of the retina.
→ Chambers: → Are filled with a watery fluid that gives shape to the eye and helps refract the light rays.
→ Retina: → The inner layer that contains the nerve cells, rods, cones & the bipolar cells.
↳ Rods: Sensitive to light but do not sense colour.
↳ Cones: Sense colour.
→ Vision defect - Glaucoma:
↳ Increase in intraocular pressure (IOP) often due to obstruction of outflow of aqueous humor (jelly-like fluid between lens & cornea).
↳ Untreated causes irreversible damage to the optic nerve & retinal fibres resulting in a progressive, permanent visual loss or blindness.
THE EAR - HEARING & EQUILIBRIUM:
Stapes (attached to the oval window).
Incus.
Malleus.
Vestibular nerve.
Cochlear nerve.
Vestibule.
Auricle. Cochlea.
Round window.
Ear canal.
Tympanic
membrane. Eustachian tube.
Tympanic
cavity.
External ear. Middle ear. Internal ear.
→ Touch. → Taste. → Hearing.
→ Smell. → Sight. → Equilibrium (balance).
THE EYE:
Sclera.
!
Vitreous chamber. Choroid.
Posterior chamber.
Iris. Fovea.
Cornea.
Lens. Retina.
Anterior chamber.
Suspensory ligaments.
·
Optic nerve.
→ Sclera: → Outer white layer that maintains the shape of the eye.
→ Muscles attached to the sclera control eye movements.
→ Choroid: → Middle layer that contains the blood vessels.
→ Cornea: → A clear, circular area in the sclera where light enters the eye.
→ Pupil: → The circular opening in the front of the choroid.
→ Iris: → Coloured smooth muscle surrounding the pupil which adjusts the size of the opening according to the brightness of light.
→ Lens: → Located behind the pupil, between the anterior & posterior chambers.
→ Is a transparent flexible by convex structure that bends or refracts light rays so they focus on the nerve cells of the retina.
→ Chambers: → Are filled with a watery fluid that gives shape to the eye and helps refract the light rays.
→ Retina: → The inner layer that contains the nerve cells, rods, cones & the bipolar cells.
↳ Rods: Sensitive to light but do not sense colour.
↳ Cones: Sense colour.
→ Vision defect - Glaucoma:
↳ Increase in intraocular pressure (IOP) often due to obstruction of outflow of aqueous humor (jelly-like fluid between lens & cornea).
↳ Untreated causes irreversible damage to the optic nerve & retinal fibres resulting in a progressive, permanent visual loss or blindness.
THE EAR - HEARING & EQUILIBRIUM:
Stapes (attached to the oval window).
Incus.
Malleus.
Vestibular nerve.
Cochlear nerve.
Vestibule.
Auricle. Cochlea.
Round window.
Ear canal.
Tympanic
membrane. Eustachian tube.
Tympanic
cavity.
External ear. Middle ear. Internal ear.
