systema nervosum
STAGES OF DEVELOPMENT OF THE NERVOUS SYSTEM in the fetus
neuron
central systema nervosum
peripheral systema nervosum
anatomy
physiology
histology
This central nervous system functions to hold all control and regulation over the work of the neural network to the nerve cells. These parts of the nervous system are the cerebellum, cerebellum, spinal cord and advanced marrow.
enchepalon
medulla spinalis
The cerebrum (Telecephalon) is the largest part of the brain and occupies the middle and anterior cranial phosphises. Cerebrum is also referred to as
cerebral cortex or forebrain. The cerebrum is the part of the brain that distinguishes humans from animals. Cerebrum makes humans have the ability to think, analyze, logic, language, consciousness, planning, memory and physical abilities. Intellectual intelligence or human IQ is also determined by the quality ofcerebrumng.
The spinal cord is the most important structure between the body and the body. The spinal cord runs from the foramen magnum where it continuouswith the medulla to the first or second level of the lumbar vertebra, the spinal cord nerves (spinal nervus) number 31 pairs of combined nerves (sensory-motor). The spinal (spine) nervous system is derived from the dorsal direction, so it is sensory
The parts of the brain can be grouped in various ways based on anatomic distinctions, functional specialization, and evolutionary development.
The major structures comprising the CNS are the cerebrum, cerebellum, and spinal cord. The CNS is completely covered by connective tissue layers, the meninges, but CNS tissue contains very little collagen or similar material, making it relatively soft and easily damaged by injuries affecting the protective skull or vertebral bones.
.
anatomi
histology
System nerve edge connect system nerve center with remainder body. All motor,nerve sensory and autonomous celland fiber outside CNS generally considered as part from system nerve edge.Based on function system nerve edge shared Becomes 2 that is :
Peripheral nerve fibers are all nerve fibers that exit from the brain (12 pairs of cranial nerves) and spinal cord (31 pairs of spinal nerves). These nerve bundles consist of dendrites and axons which are histologically indistinguishable from one another. These are all called axons, or simply call them nerve fibers. The connective tissue covering the nerve fibers is classified into the epineurium, perineurium, and endoneurium
physiology
. Microscopically the nerve has several parts in which it is the outermost part of the connective tissue part of the endometrium in the layer outside the axon, Then there is the perinerium lining the vasicles, and there is an epineurium on the outer layer in the vesicles and blood vessels . In peripheral nerve branches have parts namely axons and dendrites, Axons are lined by a layer of myelin formed on Schwann cells. Axons have the strongest function which is that the neuron makes a connection with the target cell to provide some information, makes a conduction structure to transmit the action potential to the synapse, and a certain subdomain for the transmission of signals from the neuron to the target cell. Whereas dendrites have a branched structure, the course of dendrites will probably relate to many different axons and distant neurons or will be innervated with a single axon that makes synapse contact. The basis of the dendrites continues with the cytoplasm of the cell bod
cranial nervus
spinal nervus
paccinian corpuscle
meissner corpuscle
ganglion
motor and plate
sensory peripheral nerve circuit
motor peripheral nerve circuit
neuron type
neuron sel
neuroglia sel
structure
function
dendrit, soma, nukleus, akson, mielin, nodus ranvier, akson terminal
Receive, Integrate, & Deliver Messages in the form of action potential
neuron type
bipolar
multipolar
unipolar
kind of neuroglia
function
shcwan sel, atrosit sel,ependim sel, oligodendrosit, mikroglia
forms myelin neurons, as a protector of neurons, providing a microenvironment appropriate for the activity of neurons.
sinaps
electrical synapses
chemical synapses
The action potential propagates from the presynaptic cell to the postsynapse cell. It is then connected by an intercellular channel that flows local action potential ions to flow between neurons.
The action potential electrical signal that arrives at the synaptic terminal is converted into a chemical signal that flows through the synapse, then the chemical signal is converted back into an electrical signal in the postsynaptic cell.
Nerves are in charge of sending information back to the brain and spinal cord for processing, then relaying messages back to muscles and organs about how and when to act. Then, the fetal nervous system is one of the first systems to develop
just 16 days after conception, the baby's neural plate in the womb has formed, this is the foundation of his brain and spinal cord. This neural plate grows longer and folds over itself, until these folds turn into grooves, and these grooves turn into the neural tube.
after the neural tube closes, around the 6th or 7th week of pregnancy, the neural tube will bend and swell into three parts, namely the forebrain, midbrain, and hindbrain
Then in the 8th week of pregnancy and beyond, these nerves make connections with each other, with muscles and other tissues, then with organs like your baby's eyes and ears.
At the 12th week, the nerves begin to be able to send simple signals that stimulate the baby's reflexes. So, the baby can open, close, and roll his fingers.
Babies can also squint their eye muscles and make sucking movements with their mouths. Around the 20th week, a protective, whitish coating called myelin begins to grow around the nerves of the fetus.
myelin insulates nerves and speeds up their complex messaging system. This myelin continues to develop during pregnancy until the first year of your little one's life.
At 28 weeks, the nerves are connected to the organs in the baby's body, so that your baby's sense of hearing, sight, smell and taste can begin to function. At this time, the fetus can recognize the sound of your breathing, heartbeat, and the rumbling of your digestion
The fetus also begins to blink in response to bright light, and can even see colors. Then in the last trimester of pregnancy, brain development will accelerate because the weight has tripled.
Deep grooves are starting to form in the baby's cerebrum to allow more surface area for brain cells to communicate with one another