Images Dated 5th September 2005

Human skull, X-ray

Human skull. Coloured X-ray of a sagittal section through a human skull. The skull has been sliced in half down the centre, revealing details of the internal structures. These include the delicate bones and spaces of the paranasal sinuses (around the nose and eyes, centre left). The fused bones of the cranium encase and protect the brain. The nasal, cheek and upper jaw bones are fused to the cranium to form the facial skeleton (left). The lower jaw bone (mandible, lower left), is attached at flexible joints, allowing it to move. The upper and lower jaw bones contain 32 permanent teeth (lower left). The eye sockets (one at far left) house the eyes

© D. ROBERTS/SCIENCE PHOTO LIBRARY

Green sea turtle with a remora on its shell, North Sulawesi

Green sea turtle (Chelonia mydas) resting on a rocky ledge with a remora on its shell, North Sulawesi, Indonesia

© Mathieu Meur/Stocktrek Images

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Illustration of a 33 day old human embryo

Human embryo. Illustration of a human embryo after approximately 33 days. After around 33 days the embryo is not yet recognisably human and measures only around 5mm in length. The developing ears appear as pits (upper centre) and rudimentary eyes develop in the form of stalks. The nose and mouth will develop from the folds in the neck. Below the neck is the heart bulge; at this stage the immature heart already produces a form of heartbeat. Rounded buds form the beginnings of arms and legs and internal organs are growing. The back grows more rapidly than the front in the young embryo, giving it a C-shape and a conspicuous tail

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY