X1011773886-00175-45880</DOCNO> Nervous system The Nervous System The nervous system is the most complex system of the body, yet it is very conservative in terms of change The nervous system determines responses of the body to changes in internal and external environments It also acts as a messenger and coordination system for the body The primary components of the nervous system are: the central nervous system - the brain and spinal cord the peripheral nervous system - the cranial and spinal nerves All parts of the nervous system are composed of a common cellular subunit - the neuron Neurons Neurons are derived from ectoderm from the neural tube, neural crest cells, or ectodermal placodes.
(The nervous system; is; the most complex system of the body) (the neuron Neurons Neurons; are derived; from ectoderm) (It; acts; as a messenger and coordination system for the body) Context(It acts,List([273, 285))):(The primary components of the nervous system; are; ) (it; is; very conservative) Context(it is,List([129, 134))):(The nervous system; determines; responses of the body to changes in internal and external environments) Context(it is The nervous system determines,List([129, 201))):(the central nervous system - the brain and spinal cord the peripheral nervous system - the cranial and spinal nerves All parts of the nervous system; are composed; of a common cellular subunit)
It acts,List([273, 285)) it is,List([129, 134)) it is The nervous system determines,List([129, 201))
The nervous system the neuron Neurons Neurons It The primary components of the nervous system it The nervous system the central nervous system - the brain and spinal cord the peripheral nervous system - the cranial and spinal nerves All parts of the nervous system
is are derived acts are is determines are composed
the most complex system of the body
from ectoderm
as a messenger and coordination system for the body
very conservative
responses of the body to changes in internal and external environments
of a common cellular subunit