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Home > All Images > 2003 > March > 21 Mar 2003

Images Dated 21st March 2003

Choose from 61 pictures in our Images Dated 21st March 2003 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Spiral shape of a fossilised ammonite shell Featured 21 Mar 2003 Print

Spiral shape of a fossilised ammonite shell

Ammonite. Fossilised spiral shell of an ammonite, an extinct squid-like cephalopod animal (sub- class: Ammonoidea) related to the living nautilus. The outer ridges of the shell are seen. Internally the shell was divided into chambers; by pumping water into and out of the chambers the animal could move down and up in the water. This sea creature lived in the outer chamber of the shell. Many species of ammonite flourished from the Devonian period (400 million years ago) until becoming extinct at about the same time as the dinosaurs at the end of the Cretaceous period (about 65 million years ago). This specimen was found in the Sahara desert, once a sea

© Martin Bond/Science Photo Library

Lungs, CT scans Featured 21 Mar 2003 Print

Lungs, CT scans

Lungs. Sequence of six coloured axial CT (computed tomography) scans through the upper chest of a 52- year-old woman. The front of the chest is at top, and the right of the body is at left. The sequence moves down through the body as it runs from left- right along top then bottom. The two lungs (dark blue) and their branching airways (bronchioles, light blue) are separated by the mediastinal area (centre). This contains the trachea (blue circle) that splits into the two lung bronchi (images 4- 6). Major blood vessels (orange, upper centre) lead to the top of the heart (seen in images 4-6). The bone (dark orange) of the spine (lower centre) and ribs (surrounding the lungs) is also seen


Spongy bone tissue Featured 21 Mar 2003 Print

Spongy bone tissue

Cancellous bone. False-colour scanning electron micrograph of trabeculae in cancellous (spongy) bone tissue. Bone tissue is divided into compact & cancellous. The latter fills the interior of bones & the cavities between the trabeculae are occupied by bone marrow. Trabeculae are thin & composed of irregular lamellae of bone with lacunae containing osteocytes. Some of these lacunae are visible as tiny orange holes at upper centre. Osteblasts are the cells responsible for bone formation. Once they cease activity & become embedded in bone matrix they are called osteocytes. Magnification: x40 at 6x7cm size. Magnification: x40 at 4x5 inch size

© Prof.P.Motta/Dept.Of Anatomy/University la Sapienza , Rome/Science Photo Library