The issue often occurs when sectioning which tissue type?

• A. Uterus
• B. Brain
• C. Lung
• D. Muscle

Answer: (A)

Tissue difficulty in sectioning comes from how its physical properties respond to cutting. The uterus is rich in smooth muscle (the myometrium) with dense, elastic tissue and varying density between the muscular wall and the endometrium. This makes the tissue prone to distortion as the knife passes through: contractions or uneven density can cause curling, folds, or tearing in the sections. Proper fixation helps minimize contraction and shrinkage, and adjusting microtomy technique (knife sharpness, section thickness, and consistent block orientation) improves results. Brain tends to be very soft and friable, lung has air-filled spaces that create holes, and muscle can be tougher but more uniform; the uterus stands out because its contractile, heterogeneous tissue often leads to the specific sectioning artifacts described.