axial_skeleton-lab - Axial Skeleton page 1 of 4 ANAT 11110...

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Axial Skeleton page 1 of 4 ANAT 11110 Lab 6 Fall 2011 The Axial Skeleton The skeletal system is composed primarily of bony connective tissue. The skeletal system serves many purposes within the body. - It serves as the internal scaffolding for the body, thus providing structure and support. It also protects those soft organs enclosed by it (e.g., the brain within the skull, the heart and lungs within the rib cage). - The bones of the skeletal system act as levers, resulting in movement of body segments and locomotion of the body as a whole. - The interior of many bones is filled with red bone marrow, which is the site of blood cell formation (aka, hematopoiesis). - The bones within the skeletal system serve as a reservoir for calcium and other inorganic minerals crucial to proper body physiology. To understand how the skeletal system works, it is helpful to first understand the microscopic architecture of a bone. All bones within the body are composed primarily of two types of bony tissue, compact bone and spongy bone. Compact bone is found on the exterior surface of all bones, while spongy bone is found in the interior of all bones. Station 1: Microscopic Anatomy of Bone When viewed under the microscope, bony connective tissue has a very distinctive appearance. The circular structure you observe is called an osteon . Compact bone is composed of many osteons, stacked together to yield the dense outer layer of bony tissue of a bone. Spongy bone is found in the interior of bones. It is composed of a lattice-like arrangement of bony struts. Blood vessels weave through this open latticework to provide nourishment to the bone cells of spongy bone. Examine a slide of bone. In the space below, draw a diagram of compact bony connective tissue.
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Axial Skeleton page 2 of 4 Station 2: Bone Shape One way to classify bones is by their general shape. As with most things in the body, shape is closely tied to function. Keep this in mind as you learn the individual bones of the body later in this lab and in the next lab. - Long bones: longer than wide, cylindrical (e.g., humerus and femur); main
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This note was uploaded on 01/03/2012 for the course ANAT 11110 taught by Professor Manley-buser during the Fall '11 term at Palmer Chiropractic.

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axial_skeleton-lab - Axial Skeleton page 1 of 4 ANAT 11110...

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