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SENSORY ORGANS AND SYSTEM - Coggle Diagram
SENSORY ORGANS AND SYSTEM
EYE
Direction of light sequence:
-Front of retina
-Optic nerves fibres
-Ganglion cells
-Amacrine cells
-Bipolar cells
-Horizontal cells
-Photoreceptors cells
Retina: sensing layers of 5 nerve cell types (photoreceptors,
bipolar, horizontal, amacrine and ganglion)
Eye anatomy: Cornea, anterior chamber, lens, vitreous
chamber, retina, aqueous humor
Direction of retinal visual processing:
-Photoreceptor cells
-Horizontal cells
-Bipolar cells
-Amacrine cells
-Ganglion cells
-Optic nerve fibres
-Front of retina
EAR
transmit airbonrne sound waves to the fluidfiled inner ear,amplify sound energy
contains receptors for conversion of sound wave into nerve
impulses, making hearing possible
Pathway of sound
Through the scala vestibuli, around the helicotema and the scala tympani, causing the round window to vibrate
A shortcut from the scala vestibuli through the membrane.This pathway trigger activation of the receptor for sound by bending hair of hair cells.
NOSE
To be smelled, the substance must be;
Sufficiently volatile so that some of its molecules can enter
the nose in the inspired air.
Sufficiently water soluble so that it can dissolve in the mucus
coating the olfactory mucosa.
The smell depends on the olfactory receptor cells detecting
odours or scents.
Tongue
Signals in sensory inputs are conveyed via synaptic stops in
the brain stem and thalamus to the cortical gustatory area
The receptor for taste and smell are chemoreceptors, which generates neural signals on binding with particular chemicals in environmen
Taste signals are also sent to the hypothalamus
and limbic system to add effective dimensions
Nerve
Spinal Nerves ( 31 pairs ).
-Extend from the spinal cord to areas of the body.
Cranial Nerves ( 12 pairs )
Nerve from the brain
Types of nerve
Mixed nerves. contains both sensory and motor
neurons.Transmit impulses to and from the CNS
-transmit impulses from the CNS
Motor Nerves.
-Contain motor neurons.
Sensory nerves
-contain sensory neurons
-Transmit impulses to the CNS