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Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, known as neurones. Nerve cells occur in the brain, spinal cord, and in ganglia. Each nerve cell has a large cell body (brown) with several long processes extending from it. The processes usually consist of one thicker axon and several thinner branched dendrites. The dendrites collect information in the form of nerve impulses from other nerve cells and pass it to the cell body.

Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, known as neurones. Nerve cells occur in the brain, spinal cord, and in ganglia. Each nerve cell has a large cell body (brown) with several long processes extending from it. The processes usually consist of one thicker axon and several thinner branched dendrites. The dendrites collect information in the form of nerve impulses from other nerve cells and pass it to the cell body.

Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

Fertilization. Coloured scanning electron micrograph (SEM) of a sperm (blue) attempting to penetrate a human egg (orange).

Fertilization. Coloured scanning electron micrograph (SEM) of a sperm (blue) attempting to penetrate a human egg (orange).

You know you're a bio/chem major when a scanning electron micrograph of a stem cell takes your breath away...I guess I am a nerd.

You know you're a bio/chem major when a scanning electron micrograph of a stem cell takes your breath away...I guess I am a nerd.

Diatom. Coloured scanning electron micrograph (SEM) of a Stephanopyxis sp. diatom.

Diatom. Coloured scanning electron micrograph (SEM) of a Stephanopyxis sp. diatom.

Micro Monsters: scanning electron microscope images of insects, spiders and creepy crawlies  Coloured scanning electron micrograph (SEM) of a maggot head    "I've tested the book out on my son Ned and it hasn't given him any bad dreams, in fact he loves it. In particular Ned likes like the nasty worms."    A maggot head

Micro Monsters: scanning electron microscope images of insects, spiders and creepy crawlies Coloured scanning electron micrograph (SEM) of a maggot head "I've tested the book out on my son Ned and it hasn't given him any bad dreams, in fact he loves it. In particular Ned likes like the nasty worms." A maggot head

A coloured scanning electron micrograph of the head of a human flea (Pulex irritans)

A coloured scanning electron micrograph of the head of a human flea (Pulex irritans)

Sunflower pollen grains. Coloured scanning electron micrograph (SEM) of pollen grains from the sunflower (Helianthus annuus). The grains have a spiked outer wall (exine), which may assist in their dispersal by improving their adherence to pollinating insects.

Sunflower pollen grains. Coloured scanning electron micrograph (SEM) of pollen grains from the sunflower (Helianthus annuus). The grains have a spiked outer wall (exine), which may assist in their dispersal by improving their adherence to pollinating insects.

cochlear inner hair cell from fantastic website Cell Image Library

cochlear inner hair cell from fantastic website Cell Image Library

Lung cancer cell division. Coloured scanning electron micrograph (SEM) of a lung cancer cell during cell division (cytokinesis). The two daughter cells remain temporarily joined by a cytoplasmic bridge (centre). Cancer cells divide rapidly in a chaotic, uncontrolled manner. They may clump to form tumours, which invade and destroy surrounding tissues.

Lung cancer cell division. Coloured scanning electron micrograph (SEM) of a lung cancer cell during cell division (cytokinesis). The two daughter cells remain temporarily joined by a cytoplasmic bridge (centre). Cancer cells divide rapidly in a chaotic, uncontrolled manner. They may clump to form tumours, which invade and destroy surrounding tissues.

Scanning electron micrograph of a diatom, microscopic algae that form the base of the food chain.

Scanning electron micrograph of a diatom, microscopic algae that form the base of the food chain.

Bdelloidea are microscopic aquatic animals that are related to roundworms, found in freshwater and moist soil. Interestingly, a male has never been observed within the species; females reproduce exclusively by parthenogenesis (without fertilization).

Bdelloidea are microscopic aquatic animals that are related to roundworms, found in freshwater and moist soil. Interestingly, a male has never been observed within the species; females reproduce exclusively by parthenogenesis (without fertilization).

Fimbriae of a Fallopian tube, coloured scanning electron micrograph

Fimbriae of a Fallopian tube, coloured scanning electron micrograph

Diatom, coloured scanning electron micrograph (SEM). -- David McCarthy

Diatom, coloured scanning electron micrograph (SEM). -- David McCarthy

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