This document provides an overview of various cell and tissue structures seen under the microscope during lab 1. It includes structures like the nucleus in mammalian cells, flagellum in sperm cells, membranes in pacinian corpuscles, cilia in intestinal epithelium, microvilli in macerated columnar epithelium, mitochondria, striations in skeletal muscle, pigments in skin, axons and dendrites in the cerebellum, and chromatin structures in cell divisions. The document serves as a reference for the key cellular components and tissues viewed during the initial microscopy lab.