Eyes Flashcards
Sensory receptors
Monitor conditions outside of body
Special senses
Olfaction Gustation vision equilibrium (balance) audition (hearing)
General senses
Temperature pain touch pressure vibration proprioception (body position)
Nociceptors
Pain receptors in skin joints bones and vessels
Fast pain
Carries by myelinated fibers
Slow pain
Carried by in myelinated fibers
Thermoreceptors
Temperature receptors in skin muscles liver and brain
Tactile receptors
Touch receptors in skin
Baroreceptors
Pressure receptors in organs
Proprioreceptors
Position receptors in joints tendons and ligaments
Chemoreceptors
Detect dissolved chemicals
Sty
Infection in sebaceous gland of hair follicle
Conjunctiva
Tissue that lines eyelids and continues on to the eye up the cornea. Infection is called pinkeye
Three tunics of the eye
Fibrous (outer)
Vascular (many blood vessels)
Nervous ( inner with many neurons)
Sclera
In fibrous layer
White of eye
Protects + attachment for muscles
Cornea
In fibrous layer and transparent
Choroid
In vascular layer
brown membrane lining the Sclera
Absorbs light
Ciliary body
In vascular layer and connected to lens by ligaments
made of smooth muscle
Iris
In vascular layer
Colored part regulating amount of light
Pupil
In vascular layer
opening in the Iris
Black dot
Lens
In vascular layer Behind pupil and iris Transparent when healthy Controls shape of eye as it focuses Cataracts=milky colored=unhealthy Shape changed by accommodation Separate eye into anterior/posterior
Aqueous humor
Watery fluid in chambers of anterior eye and is continuously recycled
Absorbed into canal is shlemm
Glaucoma
High eye pressure
Vitreous humor
Gel fluid in posterior cavity and is not recycled through bloodstream
Retina
Part of nervous layer
lines the posterior wall
Detects light and transports impulses to the optic nerve
Made of photoreceptor cells (nearest choroid) and bipolar neurons and ganglion cells(inner layer)
Photoreceptors
In retina
Respond to light
Rods cells (sense light)
Cone cells (sense color but need more light)
Bipolar neurons
In retina
Transmit signal to inner layer made of ganglion cells
Ganglion cells
Have large axons forming the optic nerve
Optic disc
Blind spot where images are focused
Macula lutea
Yellowish spot near center of retina containing fovea centralis
Fovea centralis
Depression full of come cells
Emmetropic
Normal eye
Myopia
Eye is too long
image focused in front of the retina distant objects blurred nearsightedness
fixed with a concave lens
Hyperopia
Farsightedness
image focused behind retina
eye too short
fixed with convex lens
