A long bone which extends from the shoulder. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat). The proximal extremitiy consists of the head, neck and two tuberosities and the intertuberal groove. Compact (cortical) bone: A hard outer layer that is dense, strong, and durable. 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. Structure. The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The end of the long bone is the epiphysis and the shaft is the diaphysis. The epiphyseal plate is where the bones grow in length. Figure 6.3.1 â Anatomy of a Long Bone: A typical long bone showing gross anatomical features. Epiphysesâ These are the proximal and distal ends of the bone. Bones are composed of two types of tissue: 1. The interior part of the long bone is the medullary cavity with the inner core of the bone cavity being composed of marrow. 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 shaft in the long bone itself is called the diaphysis. A typical long bone consists of the following parts: The diaphysis (growing between) is the shaft of a long bone â the long, cylindrical, main portion of the bone. 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 Shaft of a long bone is called diaphysis. A long bone consists of the following parts-Diaphysisâ It is the cylindrical shaft or body of the bone. 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 ⦠The periosteum is a soft outer covering over the boneâs surface. The largest part of any long bone is the long cylindrical middle, called the diaphysis. 2. Bones that do not fit one of the preceding categories are called irregular bones. It makes up around 80 percent of adult bone mass. Metaphysesâ These are the regions between the diaphysis and the epiphyses. When a human finishes growing these parts fuse together. Irregular bones. The structure of a long bone allows for the best visualization of all of the parts of a bone (). The outside of the flat bone consists of a layer of connective tissue called the periosteum. Moving from outside the bone to inside the bone, here are the layers: Periosteum; Cortical, or Hard Bone; Cancellous, or Spongy Bone; Bone Marrow; Letâs take a closer look. 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