Nervous Tissue Flashcards
What is the in central nervous tissue?
Brain and spinal cord
What is in the peripheral nervous system?
Cranial nerves spinal nerves and ganglia
What are the functions of the nervous systems?
Collect info, process CNS input, and respond via PNS
What is responsible for receiving sensory info form receptors and transmitting info to the CNS?
Sensory (Afferent) division
What is responsible for transmitting motor impulses from the CNS to muscles or glands?
Motor (Efferent) division
What are the exitable cells that initiate and transmit nerve impulses?
Neurons
What are nonexitable cells that support and protect the neurons?
Glial cells
What serves as the neurons control center and is responsible for receiving integrating and sending nerve impulses?
Cell body
What branches off the cell body and conducts nerve impulses towards the cell body?
Dendrites
What transmits nerve impulses away from the cell body?
Axon
What makes glial cells different from neurons?
They are smaller and capable of mitosis
What has cell processes that wrap around the outer surface of capillaries in the brain to make them more selectivdly permeable?
Astrocytes
What is the most abundant glial cell in the CNS?
Astrocytes
What cells line the internal cavities of the brain and the central canal of the spinal cord?
Ependymal
What two cells produce the insulting material “myelin”?
Oligodendrocytes
What surounds the neurons in the nervous system?
Myelin
What type of material is myelin?
White fatty and insulated
What is a bundle of parallel axons?
Nerves
What are nerves that convey sensory info to the central nervous system and all the axons conducts impulses in the same direction?
Sensory nerves
What nerves convey motor impulses from the CNS to the muscles and glands and has all the axons conducting impulses in the same direction?
Motor nerves
What nerves carry both types of info and some axons transmit impulses in one direction while the other transmits in the opposite?
Mixed nerves
What type of nerves are spinal nerves?
Mixed nerves
What appears in the developing tissue and fused with the midline?
Neural groove
