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Human Nervous System Grade-9 BY …
Human Nervous System
Grade-9 BY Mohan Prasad Sapkota
Central Nervous System
Brain
Mid-Brain
Hind- Brain
Fore-Brain
Cerebrum (80% Of Brain) Known as big brain
It controls all voluntary actions
Speech, Memory, Hearing
Analyze, synthesize, solving, creation, learn
Controls consciousness,thaughts,emotions and stimuli
Cerebellum (about 10% of Brain)
Maintaining Balance
Coordinating movement
Motor action
Medulla Oblongata (0.5% by weight) Known as lower brain
It control respiration
Involentary activities(Vomiting,coughing,sneezing)
Control the function of blood vessel
helps to secrete hormones and enzymes
Pons varoli
About 2.5 cm long bridge between spinal chord and brain
It is relay station between brain to other part
Spinal Cord
45 cm long and 2 cm in diameter
It coordinate all part of body to brain
Afferent , Efferent, Mixed nervs
Peripheral Nervous System
Coordinate CNS to various part of body
Made up of two types of nerve fibers
Cranial nerves
12 pair
Communicate brain with Head
Spinal nerves
31 pair
Communicate with Brain to all part of body (Except Head
Autonomic Nervous System
Sympathetic nervous system
It lower the function of body organ system
Parasympathetic nervous system
It increase function the body system( Heart rate lungs, stomach, blood pressure
Video Link YouTube
