BLG 10A/B Chapter Notes - Chapter 11-12: Vascular Permeability, Ependyma, Schwann Cell
Document Summary
Blg 10a ch. 11-12 nervous system - pre-lecture questions. Histology of nervous tissue: identify the function of the following neuroglia: astrocytes, microglia, ependymal cells, oligodendrocytes, (in the cns) and satellite cells, schwann cells (in the pns) Microglia: small ovoid cells with relatively long "thorny" processes (branches). Oligodendrocytes: have fewer processes (branches) than astrocytes, line up along the thicker neuron fibers in the cns and wrap their processes around fibers, producing insulating covering called myelin sheaths. Dendrites: motor neurons have hundreds of dendrites clustering close to the dendrite body, are the main receptive/input regions. These electrical signals are not action potentials (nerve impulses) but are short-distance signals called graded potentials. Form network throughout the cell body: cell body of some neurons contains pigments. Axon: initial region of axon arises from the axon hillock. Long axons (like in motor neurons) are called a nerve fiber: axon collaterals are occasional branches along the length of the axon, extending from the axon at right angles.
