Haversian canals (also called central canals) run longitudinally through the bone and contain blood vessels and nerves which supply the bone.
Business casual: Generally means khaki pants, a plain polo shirt or a long-sleeved casual button-down oxford shirt, a V-neck sweater, sometimes a sports coat or blazer, and brown leather shoes. Loafers are a good choice, and you should wear socks.
wear pants styles such as khakis dress pants trousers and corduroy pants jeans are not considered business casual pleated pants and dark colors are more formal conservative choices if you want to be on the safe side overdressing is less frowned upon than underdressing