Nerve cell growth
Nerve cell growth. Fluorescent light micrograph of PC12 cells following stimulation by nerve growth factor. The cell bodies contain the nuclei (purple). The initially spherical cells have formed long branching extensions called neurites (grey and green). These neurites would form the axons and dendrons that connect nerve cells and transmit nerve impulses around the body, and the brain and spinal cord. PC12 cells are derived from a tumour of the adrenal gland (pheochromocytoma). Research into curing spinal paralysis uses nerve tissue cultures to investigate neural regeneration. Magnification: x670 when printed 10cm wide.
© Dr Torsten Wittmann/Science Photo Library
Nerve cells, SEM
Nerve cells. Coloured scanning electronmicrograph (SEM) of nerve cells, known asneurones. Nerve cells occur in the brain, spinalcord, and in ganglia. Each nerve cell has a largecell body (brown) with several long processesextending from it. The processes usually consistof one thicker axon and several thinner brancheddendrites. The dendrites collect information inthe form of nerve impulses from other nerve cellsand pass it to the cell body. This information isinterpreted by the cell body, and then passed onalong the axon. In this way neurones allowinformation to be rapidly received, interpreted, and relayed around the body. Magnification:unknown.
© Steve Gschmeissner/Science Photo Library
and Bottlenose dolphin (Tursiops truncatus), cooperating while fishing. Together, they herd fish into a tight ball close to the shore, making for easier capture.
Leschenault Inlet, Western Australia
© Robert McLean/AUSCAPE All rights reserved
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