Nervous system

1.

NERVOUS
SYSTEM

2.

GENERAL STRUCTURE
OF NERVOUS SYSTEM
System consist of:
Neurons and synapses
Nerve junctions
Brain
Spinal cord
nervous system
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3.

FUNCTIONS OF
NERVOUS SYSTEM
1.coordinates the interaction of the organism
with environment
2.coordinate the functions of different tissues
and organs
3.integrates the parts of the body into a whole
4.the central organ for maintaining
homeostasis
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4.

NERVOUS TISSUE
Nervous system formed by nervous tissue. Nervous tissue consist of cells
which called neurons. Neurons consist of soma and outgrowths, axons and
dendrites, and synapses as well. Dendrites is a short outgrowths by which
impulse comes to neurons. Axons is a long outgrowths by which impulse
come out of neurons to other organs and cells. Synapse is a "point of
contact" neurons. In synapse happens transmission of impulse.
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5.

BRAIN
Brain consist of 5 deparments:
1.ceberal hemispheres (speech, memory, incoming and accumulation of
information etc.)
2.Posterior(bridge and cerebellum)(coordination)
3.In Between (sleep, starving, neurohumoral regulation, thermoregulation etc.)
4.Oblong(reflexes, control of respiratory centers, muscle control etc.)
5.Midbrain(Average)(sight, rumor, concentration of attention etc.)
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6.

SPINAL CORD
Spinal cord is a part of nervous system which provides moving
and sensory function. Spinal cord consist of 31 segments: 8
cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal.
Anterior and posterior longitudinal sulci divide spinal cord into
two halves. In center runs the spinal canal, which contains
cerebrospinal fluid. Cerebrospinal fluid have 2 main function:
amortization and nutrition of spinal cord ( metabolism).
In the middle part of the spinal cord near the spinal canal
is located the gray matter. The gray matter is formed by neuron
bodies and dendrites, and it distinguished by anterior and
posterior horns. The gray matter is surrounded by white matter
formed by axons of nerve cells. In anterior horn located insertion
neuron bodies. In posterior horn located motor neuron bodies.
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7.

REFLEXES
Reflexes is a one of the main pillars of functioning. Reflexes fall into two
types: inborn and acquired. All people has inborn reflexes. Acquired
reflexes are formed over the course of lifetime.
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