Textbook Question
Match the appropriate name with the structure in the figure.
5. Osteocyte
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6. Bones & Skeletal Tissue
Microscopic Anatomy of Bones - Bone Cells
3:59 minutesProblem 8
Textbook Question
The presence of an epiphyseal line indicates:
(a) Epiphyseal growth has ended
(b) Epiphyseal growth is just beginning
(c) Growth of bone diameter is just beginning
(d) The bone is fractured at the location
(e) No particular event
Verified step by step guidance1
Understand that the epiphyseal line is a remnant of the epiphyseal plate, which is a region of cartilage found in growing bones.
Recall that the epiphyseal plate is responsible for longitudinal bone growth during childhood and adolescence.
Recognize that when the epiphyseal plate ossifies and becomes the epiphyseal line, it indicates that the bone has stopped growing in length.
Eliminate options that suggest growth is beginning or that the line indicates a fracture, as these do not align with the biological role of the epiphyseal line.
Conclude that the presence of an epiphyseal line means that epiphyseal growth has ended.
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Video duration:
3mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epiphyseal Plate and Line
The epiphyseal plate, or growth plate, is a layer of cartilage found in growing bones where new bone tissue forms, allowing lengthwise growth. When growth ceases, this cartilage is replaced by bone, forming the epiphyseal line, which indicates that the bone has reached its adult length.
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Bone Growth in Length vs. Diameter
Bone growth in length occurs at the epiphyseal plates through endochondral ossification, while growth in diameter (appositional growth) happens at the bone's surface. The epiphyseal line specifically relates to lengthwise growth cessation, not diameter growth.
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Bone Fractures and Anatomical Markers
A bone fracture is a break or crack in the bone, which is a pathological condition, not a normal anatomical feature. The epiphyseal line is a normal anatomical marker indicating growth completion, not a sign of fracture.
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