NEURO & SENSORY systems pp Flashcards
Humans have the central nervous system (CNS) which is composed of what 2 parts?
brain and spinal cord
Humans have the peripheral nervous system (PNS) contains?
All nerves and ganglia that lie outside the CNS
The peripheral nervous system (PNS) is divided into what two systems?
Somatic nervous system and Autonomic nervous system
Somatic nervous system
Sensory and motor functions that control skeletal muscle
Autonomic nervous system
Controls smooth muscle, cardiac, muscle, and glands
Neurons are?
nerve cells
Cell body contains?
nucleus and organelles
Dendrites receive signals from?
sensory receptors or other neurons
Axon conducts?
nerve impulses to another neuron or to other cells
Axons are covered by?
myelin sheath
Any long axon is also called a
nerve fiber
3 types of neurons?
Motor (efferent) neurons
Sensory (afferent) neurons
Interneurons
Motor (efferent) neurons do what?
Accept nerve impulses from the CNS
Transmit them to muscles or glands
Sensory (afferent) neurons
Accept impulses from sensory receptors
Transmit them to the CNS
Interneurons
Convey nerve impulses between various parts of the CNS
Spinal cord and brain are wrapped in three protective membranes called?
meninges
Spaces between meninges are filled with?
cerebrospinal fluid
cerebrospinal fluid is continuous with?
that of central canal of spinal cord and the ventricles of the brain
The spinal cord is composed of?
gray matter and white matter
what gives the gray matter its color?
Cell bodies and short unmyelinated fibers give the gray matter its color
what gives white matter its color?
Myelinated long fibers of interneurons running in tracts give white matter its color
