Flashcards in Nervous System** Deck (77)
What are the 3 functions of the nervous system?
Major controlling, regulatory, and communication, keeps us in touch with the internal and external environment, responsible for maintaining and regulating homeostasis
What are the 2 parts of the nervous system?
CNS and PNS
All nerves of the body residing outside of the brain and spinal cord
Consists of brain and spinal cord
Smooth muscle, cardiac muscles, glands
Contains the nucleus and most of the cytoplasm
Projections that bring impulses into the neuron
Long projection that carries impulses away form the neuron
Insulating layer produced by Schwann cells
Sheath formed form Schwann cells on the exterior of some axon
Gaps between Schwann cells
Nodes of Ranvier
Junction between 2 communicating neurons
Has many processes and part of brain or spinal cord
2 processes; eyes nose, ears
1 process; outside the brain and spinal cord
Carry impulses from the body part into the brain or spinal cord
Most common type of neuron that communicates from one neuron to the other; relays information
Carry nerve impulses out of brain or spinal cord to effectors (glands or muscles)
Support neurons and phagocytize bacterial cells and cellular debris, part of the immune system
Where are microglial cells found?
Provide insulating layers of myelin around axons within brain and spinal co
Structural support, join parts by their abundant cellular processes, help regulate concentrations of nutrients and ions within tissue
Where are oligodendrocytes found?
Align along nerve fibers
Where are astrocytes found?
between neurons and blood vessels
Specialized epithelial cells in the CNS that produce CSF
Where are ependymal cells found?
brain and spinal cord
Forms a myelin sheath around axons
Where are Schwann cells found?