The conduction velocity of the ulnar, median and peroneal nerves was studied from birth to adult age in normal infants, children and adolescents. The method allowed measurements of the conduction velocity of the thickest and fastest conducting motor nerve fibres. In newborns the conduction velocity of all 3 nerves was roughly half of that of adults. The value for the ulnar nerve increased rapidly during the first 3 years. After that age it rose only slightly and between adolescence and adult age there was a significant reduction. The value for the median nerve increased
A low white blood cell count usually is caused by: 1  Viral infections that temporarily disrupt the work of bone marrow. 2  Certain disorders present at birth (congenital) that involve diminished bone marrow function. 3  Cancer (or other diseases that damage bone marrow)  Autoimmune disorders that destroy white blood cells or bone marrow cells.
A normal white blood cell count should be between 4,000 and 11,000 leukocytes, any amount lower than that margin indicates a decline that needs to be addressed. The first step is to determine why the white blood cell count is low, a bacterial infection, a virus or conditions such as anaemia are often responsible, but there are other conditions that can lead to this condition. In our article what are the causes of a low white blood cell count you can discover all the diseases that lead to this condition.