The posterior suture shape is which?

The posterior suture shape is which?

• A. Inverted Y
• B. Upright Y
• C. Straight line
• D. Circular

Answer: (A)

The posterior suture is inverted Y. This pattern arises from how the ends of the lens fibers meet at the posterior surface as the lens grows. The meridional fiber ends converge so that, on the posterior aspect, the sutures form an inverted Y (apex pointing downward). In contrast, the anterior surface shows an upright Y due to the opposite orientation of the fiber ends. Circular or straight-line sutures don’t reflect the way these fiber ends align at the posterior pole.

The posterior suture is inverted Y. This pattern arises from how the ends of the lens fibers meet at the posterior surface as the lens grows. The meridional fiber ends converge so that, on the posterior aspect, the sutures form an inverted Y (apex pointing downward). In contrast, the anterior surface shows an upright Y due to the opposite orientation of the fiber ends. Circular or straight-line sutures don’t reflect the way these fiber ends align at the posterior pole.