Fig. 5.3-2. High magnification of brachysclereids in pear (Pyrus) fruit. Look at the cell in the very center; it appears to have dark contents, but we are just seeing the back wall. In the side walls are numerous fine lines that run directly through the secondary wall – these are simple pits. Because the wall is so thick, the pits are tunnel-like, and the main length of the pit could be referred to as a pit-canal; the inner aperture of each pit is the point where it opens into the cell, the outer aperture is where it faces the primary wall. Because these pits have parallel sides, the inner aperture is about the same diameter as the outer aperture.