end-to-end anastomosis. 1. one connecting the end of an artery and that of some other vessel. 2. anastomosis of two sections of colon, as with partial colectomy or closure of an ileostomy. end-to-side anastomosis an anastomosis connecting the end of one vessel with the side of a larger one.heterocladic anastomosis one between branches of different arteries.nd-to-end anastomosis. 1. one connecting the end of an artery and that of some other vessel. 2. anastomosis of two sections of colon, as with partial colectomy or closure of an ileostomy. end-to-side anastomosis an anastomosis connecting the end of one vessel with the side of a larger one.
Shown here is a depiction of a human brain beside a noticeably bigger elephant brain. The average human brain weighs in at around 3 pounds, and an elephant brain can weigh close to four times that much, but the biggest brains of all come sperm whales, and weigh an average of 17 pounds.
Physical Facts About the Brain. The adult human brain weights about 3 pounds and the cerebrum accounts for about 85% of the brain. The brain is composed of 40% gray and 60% white matter. The gray matter is made up of about 100 billion neurons that gather and transmit signals while the white matter is made of dendrites and axons that the neurons use to transmit signals. The brain is composted of about 75% water and is the fattiest organ in the body, consisting of a minimum of 60% fat. Humans have the largest brain to body ratio of any animal, and the blood vessels in the brain, if stretched end-to-end, would be about 100,000 miles long.