Lacunar cerebral infarction refers to old or new infarctions deep within the brain. When this occurs, lacunas or holes are formed. Depending on the infracted blood vessels, symptoms like limb numbness, dizziness, headache, aphasia and clumsiness may occur. This is due to the small arteries being blocked. Lacunar cerebral infarction may be caused by cerebral arteriosclerosis and hypertension.
cytokinesis. Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. It occurs concurrently with two types of nuclear division called mitosis and meiosis, which occur in animal cells.
In the final step, telophase, spindle fibers start to disappear, the chromosomes start to. uncoil, and two new nuclei form. Cell Division For most cells, after the nucleus divides, the. cytoplasm separates and two new cells form. In animal cells, the. cell membrane pinches in the middle, like a balloon with a. string tightened around it, and the cytoplasm divides. In plant cells, the appearance of a cell plate, as shown in Figure 4, tells you that the cytoplasm is being divided. New cell membranes form from the cell plate, and new cell walls develop from mole-cules released by the cell membranes. Following division of the cytoplasm, most new cells begin the period of growth, or inter-phase. Review cell division for an animal cell using the illustra-