The epiphyses are covered by articular (hyaline) cartilage at the proximal and distal articulation points (joints).The “hollow” center of the diaphysis, called the medullary cavity, is filled with a fatty substance called, yellow bone marrow, while the “hollow” spaces of the epiphyseal spongy bone are filled with blood making tissue called red bone marrow.The epiphysis closest to the body’s center is the proximal epiphysis, while that located farthest away is the distal epiphysis. The long shaft between the epiphyses, called the diaphysis, is composed of mostly compact bone and is “hollow.” The epiphyses are named according to their location.They are “elongated” (greater length than width) and cylindrical with enlarged, “knob-like” ends, called epiphyses (singular epiphysis ) which are mostly spongy bone covered by a thin layer of compact bone. Long bones are bones involved with large movements.
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