NERVOUS SYSTEM

• brain receives and prosses of all information from all the parts of the body.
• brain control entire organ body system of the body
• cerebrum -largest part of the brain that control your thoughts,senses,memories,thinking ,emotions,imagination
• brainstem or medulla oblongata- that connects the brain to the spinal cord
• cerebellum below in the cerebrum,that controls balance motion and body coordination and also the learning and aquiring new things
• spinal cord is connected to the brain and is about the diameter of human finger
• it is protected by a bony vertebral column and surrounded by a clear fluid called cerebrospinal fluid that acts as cushion against trauma and damage
• ascending tract -carry sensory of information from the body towards the brain such as touch,skin temperature,pain and others
• descending tract- carry information from the brainn downwards to initiate movement and control body functions
• peripheral nervous system- carries impulses from the sensory nerves to the CNS and from the CNS to the motor nerves
• somatic -regulates all the activities that are under concious control
• autonomic- regulates all activities that are involuntary or done without concious ill
• sympathetic- " fight or flight response' controls the internal functions of the body in times of stress
• parasympathetic- "rest and digest" controls the internal functions at rest;slows down the heart beat and increase the intestinal and gland activities
• sensory - carry impulses from the sense organs to the brain and spinal cord
• motor- carry impulses from the brain and spinal cord to the impulses
• associative neurons- located in CNS,analyze and interpret the data or impulses
• neuron- are responsible in sending electrical signals into and away from the brain that direct all the body activity including thinking,breathing,moving and etc.
• dentrite- root -like structure that carry electrical signals towards the cell body
• A nerve cell may have as many as 200 dentrites and single dentrite can be over one meter long
• axons- carry the electrical signals away from the cell body; it facilities the delivery of electrical impulses and supply nutrients to the entire cell
• myelin sheath- protective covering that surrounds the axon
• never ending - connects one neuron to another
• synapse- it is a gap
• neurotransmitter- chemical messenger that carries signal across synapses
• spinal cord -connects the brain and the body