The lens nucleus is primarily formed by fibers of what age?

The lens nucleus is primarily formed by fibers of what age?

• A. Younger fibers
• B. Older fibers
• C. Middle-aged fibers
• D. All ages equally

Answer: (B)

The lens nucleus is made up of the oldest fibers. The lens grows by adding new fiber cells around the outside, forming a peripheral cortex while the earliest-formed fibers are trapped in the center. Those oldest fibers lose their organelles and become densely packed as the nucleus, which is why the nucleus largely reflects the age of the initial fibers produced during fetal development and early life. Younger, middle-aged, or all-ages fibers reside mainly in the outer cortex, not the central nucleus.

The lens nucleus is made up of the oldest fibers. The lens grows by adding new fiber cells around the outside, forming a peripheral cortex while the earliest-formed fibers are trapped in the center. Those oldest fibers lose their organelles and become densely packed as the nucleus, which is why the nucleus largely reflects the age of the initial fibers produced during fetal development and early life. Younger, middle-aged, or all-ages fibers reside mainly in the outer cortex, not the central nucleus.