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Nervous System (Senses (Exteroceptors - Skin, special senses-sight,…
Nervous System
Senses
Exteroceptors - Skin, special senses-sight, hearing, taste, smell, and equilibrium.
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Proprioceptors- Muscles and their tendons , ligaments, and joints.
Monitors the degree of stretch of the organs and sends input on the body movement.
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Mechanoreceptors- Touch, pressure ,vibration, and stretch.
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FIBROUS LAYER- SCLERA-Protects eyeballs and provides shape.
CORNEA- Lets light into the eyeball and forms part of the light bending apparatus of the eye.
VASCULAR LAYER- CHOROID-Nourishes other layers, pigmented and absorbs light which prevents scattering and helps make vision clear
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OLFACTION
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OLFACTORY NERVE- Penetrates the cribriform plate of the ethmoid bone and enters the bulb.
BULB- Olfactory nerve axons branch and synapse with mitral cells.
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Nervous system
CENTRAL NERVOUS SYSTEM- BRAIN&SPINAL CORD-The central nervous system receives incoming sensory signals, interprets the signal and dictates motor responses based on past experiences, reflexes, and current conditions.
PERIPHERAL NERVOUS SYSTEM-CRANIAL NERVES&SPINAL NERVES-Cranial nerves carry signals from the brain whereas spinal nerves carry signals to and from the spinal cord.
SOMATIC-SOMATIC MOTOR- Conducts impulses from the central nervous system to skeletal muscles. Receptors spread throughout the outer tube of the body
AUTONOMIC-VISCERAL MOTORS- Conducts impulses from the central nervous system to cardiac muscle, smooth muscle, and glands.
NEURONS
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INTERNUERONS-Lie between motor and sensory neurons. Link together into chains that form complex neuronal pathways
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GUSTATION
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PATHWAY- All sensory neurons that carry taste information synapse in a nucleus in the medulla called solitary nucleus, then impulses are transmitted to the thalamus and to the gustatory area of the cerebral cortex