PHTY209 Lecture Notes - Lecture 2: Peripheral Nervous System, Multipolar Neuron, Unipolar Neuron
Document Summary
Neurons: basic functional unit, generating and conducting electrical impulses. Motor neurons: a nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland. Sensory neurons: nerve cells within the nervous system responsible for converting external stimuli from the organism"s environment into internal electrical impulses. Interneurons: a neuron which transmits impulses between other neurons, especially as part of a reflex arc. Glial (neuroglia) cells: connective tissue which contribute to the ns function by insulating, supporting and nourishing adjacent neurons. Astrocytes: surround blood vessels in ns and provide structural support, cover the exterior surface of the brain and spinal cord. They can also multiply and play a role in healing damaged neural tissue. Schwa(cid:374)(cid:374)"s cell: a cell of the peripheral nervous system that wraps around a nerve fibre, jelly-roll fashion, forming the myelin sheath: nucleus: collections of cell bodies within the cns.
