A portion of the protoplasm within the cell is specially modified to form what is known as the nucleus. This body is usually of a spherical or oval form, and is separated from the general protoplasm (cytoplasm) by a delicate nuclear membrane. The nucleus, like the protoplasm from which it is derived, consists of hyaloplasm and an intranuclear network of spongioplasm.
The nuclear spongioplasm presents, however, a most important difference from that of the cytoplasm; it contains a number of bodies which stain very readily with certain dyes and are therefore called chromatin filaments.
The nucleus is an exceedingly important component of the cell; it cannot exist apart from the cytoplasm, while cytoplasm without a nucleus is inert and soon dies.
Human nervous system
The Animal Cell
Genesis of Nerve Cells
Nerve Cells and Nerve Fibres
General Construction and Development of the Nervous System
The Spinal Cord
The Chief Fibre Systems of the Cerebro-Spinal Axis
The Areas of Localisation on the Cerebral Cortex
The Sense Organs
Human Brain Anatomy
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