Brown adipose tissue is present in small mammals (e.g., mice) and in newborn humans. Most of it disappears in adult humans. The cells in both types of fat are called adipocytes although they differ in origin, structure, and function in the two types of tissue.
On the left hand, index finger. It's not the index finger you wear it on. Left hand, ring finger. The finger that you would wear a wedding ring on.
ring finger (plural ring fingers) Finger between middle finger and little finger; the third finger (UK) or the fourth finger (US), especially of the left hand. (The ring finger is the left hand; a ring finger is either hand.) digit IV.