PRACTICALS - NERVOUS Flashcards
(27 cards)
Responsible for the production and induction of electrical impulses
Nerve Tissue
- It allows us to receive stimuli and process the information.
Nerve Tissue
nervous Tissue has two major divisions:
Central Nervous System (CNS) AND Peripheral Nervous System (PNS)
how many cranial nerves are there?
12 pairs
how many spinal nerves are there?
31 pairs
how many spinal nerves are there?
31 pairs
The functional unit in both the CNS and PNS is the
neuron or nerve cell
contains the nucleus and most of the cell’s organelles and serves as the synthetic or
trophic center for the entire neuron
The cell body, or perikaryon
the numerous elongated processes extending from the perikaryon and specialized to
receive stimuli from other neurons at unique sites called synapses
Dendrites
single long process ending at synapses specialized to generate and conduct nerve
impulses to other cells
Axon
Support neuronal survival and activities.
Glial Cells
Ten times more abundant in the mammalian brain than the neurons.
Glial Cells
GLIAL CELLS IN CNS are
Oligodendrocytes, astrocytes, epyndymal cells, microglia
Produce the myelin sheaths around axons that provide the electrical
insulation for neurons in the CNS.
Oligodendrocytes
The predominant glial cells in CNS white matter
Oligodendrocytes
are columnar or cuboidal cells that line the ventricles of the brain and
central canal of the spinal cord
Ependymal Cells
the apycal end of ependymal cells have __ which facilitate the
movement of cerebrospinal fluid (CSF
cilia
it also have ___ which re
likely involved in absorption
long microvilli
Small cells with short irregular processes evenly distributed throughout gray
and white matter
microglia
Secrete a number of immunoregulatory cytokines and constitute the major
mechanism of immune defense in the CNS
Microglia
sometimes called neurolemmocytes, are found only in the PNS and
differentiate from precursors in the neural crest.
Schwann Cells:
schwaan cells are found in
spinal nerves
Repair and production of Myelin Sheath in the PNS.
Schwann Cells:
Repairs single axon only.
Schwann Cells:
