Maag Library Medical Models: MICROanatomy

This extremely detailed bone structure model depicts a three-dimensional section of a lamellar bone, showing a typical structure of a tubular bone enlarged 80 times. The bone structure model shows various planes in cross and longitudinal section through all levels of the bone, as well as a 2-plane section through the inner structure of the bone marrow. The typical elements of a lamellar bone are easily identified in this bone structure model and help to understand its structure and function with the characteristic osteons, also referred to as Haversian systems. This bone structure model allows a graphic illustration of the interplay of the individual components, such as spongy and compact substance, endosteum, cortical substance, osteocytes, Volkmann and Haversian canals.

The first section of this model shows a vein cross section with its valves open. Here blood is able to pass through the valves to continue on its way back to the heart. The second section of this model shows a vein cross section with its valves closed. Here blood is prevented from passing through the valve in the incorrect direction. The third section of this model shows a vein cross section with its valves open and the start of blood pooling on the valves. The fourth section of this model shows a vein cross section with its valves open and a severe blood clot.

Four-stage cross-section of an artery demonstrating atherosclerosis in which the narrowing of the artery is due to a build up of fatty tissue (cholesterol) and plaque. Four stages: normal artery, fatty streak, fibrous plaque, and blockage. The stages cause a decrease in blood flow, which can lead to a blood clot or thrombus. All stages rotate on hinge pin.