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Senses (Special Senses (Sight Eye (Lens (Divider within Internal Cavities…
Senses
Special Senses
Localized
Head Region
Distinct receptor cells
Equilibrium
Ear
Hearing
Ear
Taste
Taste Buds
Smell
Nasal Cavity
Sight
Eye
Layers of External Wall
Fibrous
Most External
Sclera
White Part
Protects and Shapes
Extrinsic Eye Muscles
Corresponds to Dura Mater
Cornea
Transparent
Allows light in
Avascular
Pain Receptors
Helps focus light on Retina
Dense Connective Tissue
Vascular
Middle
Choroid
Black Pigmented
Highly Vascular
Nourishes other Layers
Absorbs Light
Prevents light from scattering
Ciliary Body
Encircles Lens
Thick ring of Smooth Muscle tissue
Changes shape of lens
Helps focus on near/distant objects
Continuous with Choroid
Iris
Eye Color
Anterior to Lens
Focuses light on Retina
Smooth Muscle
Sphincter Pupillae
Bright Light
Closr Vision
Contracts to Constrict Pupil
Dilator Pupillae
Dim Light
Distant Vision
Contracts to Widen Pupil
Pupil
Central Opening
Allows light to enter eye
Inner
Optic Nerve
Retina
Tan Color
Pigmented Layer
Neural Layer
Direct Role in Vision
Photoreceptors
Rods
Permits vision in Dim Light
Most Abundant
Sensitive to light
Cones
Bright light
Color Vision
Subtypes
3 more items...
Posterior Pole
Optic Disc
Blind Spot
No Photoreceptors
Macula Lutea
Yellow Spot
Fovea Centralis
Center of Macula
Only Cones
Maximal Visual Acuity
Most Clear
Very Thin
Lens
Divider within Internal Cavities
Posterior Segment
Vitreous Humor
Clear Fluid
Supports Retina & Lens
Helps maintain eye pressure
Transmit Light
Jellylike Substance
Anterior Segment
Aqueous Humor
Watery Clear Fluid
Nourishes Lens & Cornea
With Nutrients & Oxygen
Maintains eye pressure
Similar to Blood Plasma
Renewed continuously
Posterior Chamber
Iris to Lens
Anterior Chamber
Cornea to Iris
Avascular
Thick & Transparent
Help Focus Light on Retina
Sensory Receptor
Structures sensitive to stimulus surroundings
Taste
Smell
Touch
Signal to CNS
Brain
Spinal Cord
Hearing
Equilibrium
Sight
General Senses
Free nerve endings
Wide Spread
All over body
Stimulus Origin
Location
Interoceptors
Internal Viscera
Chemical Contraction
Taste
Stretching of Tissues
Activation of Origin
Feel Pain
Nausea
Hunger
Fullness
Proprioceptors
Musculoskeletal
Muscles
Tendons
Joints
Ligaments
Activation to Stretching
Exteroceptors
External Environment
Touch
Pressure
Pain
Temperature
Special Senses
Stimulus Type
Activation
Mechanoreceptors
Mechanical Forces
Touch
Pressure
Stretch
Vibrations
Baroreceptor
Blood Pressure
Thermoreceptors
Temperature Change
Chemoreceptors
Chemicals in solutions
Taste
Smell
Changes in blood chemistry
Photoreceptors
Light
Nociceptors
Harmful or Dangerous
Pain