It consists of a shaft and two extremities. The outside of the flat bone consists of a layer of connective tissue called the periosteum. The proximal extremitiy consists of the head, neck and two tuberosities and the intertuberal groove. Our bones are made of five main layers. Compact (cortical) bone: A hard outer layer that is dense, strong, and durable. A long bone which extends from the shoulder. Periosteum. The outer shell of the long bone is made of cortical bone also known as compact bone. The outer walls of the diaphysis (cortex, cortical bone) are composed of dense and hard compact bone, a form of osseous tissue. Moving from outside the bone to inside the bone, here are the layers: Periosteum; Cortical, or Hard Bone; Cancellous, or Spongy Bone; Bone Marrow; Let’s take a closer look. The periosteum is a soft outer covering over the bone’s surface. Epiphyses– These are the proximal and distal ends of the bone. The largest part of any long bone is the long cylindrical middle, called the diaphysis. A long bone has two parts: the diaphysis and the epiphysis. Irregular bones. A typical long bone consists of the following parts: The diaphysis (growing between) is the shaft of a long bone — the long, cylindrical, main portion of the bone. It is the main or midsection (shaft) of a long bone. The epiphyseal plate is where the bones grow in length. The end of the long bone is the epiphysis and the shaft is the diaphysis. The diaphysis takes the brunt of the force a long bone must support, and is made up primarily of compact bone -- a dense, strong bone composed of minerals, including calcium, phosphorus and … Figure 6.3.1 – Anatomy of a Long Bone: A typical long bone showing gross anatomical features. It makes up around 80 percent of adult bone mass. Long bones begin as bones At maturity the shaft of a long bone consists of a of from BIO 10087 at Arizona State University The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The distal extremity has an oblique surface for articulation with the radius and ulna which consists of two condyles of very unequal size, separated by a ridge. The structure of a long bone allows for the best visualization of all of the parts of a bone (). 2. The Shaft of a long bone is called diaphysis. Metaphyses– These are the regions between the diaphysis and the epiphyses. Structure. Cancellous bone looks like honey comb as it is very porous and is easily recognised. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat). Bones are composed of two types of tissue: 1. The epiphyses (growing over; singular is epiphysis) are the proximal and distal ends of the bone. 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