Why Do We Have Lines on the Palms of Our Hand

The lines that we have on our palm are known as the palmar creases or palmer flexion. These are the tiny ridges on the palm surface which depend upon the bone structure and the arrangement of muscles on an individual's hand. These tiny ridges are strong where the fingers and the thumb meet. These lines that we have on our palm help us fold and stretch our skin, when our hands bend. This folding of skin calls for a better grip and also prevents in the skin from tearing easily. These lines on our palm also help us to hold things firmly.

The lines that we have on our palm differ from person to person. Though Science is yet to figure out why patterns of the palmer creases differ from one individual to other. Yet it is said that the creases start to appear right when the skin starts forming. This process takes place within the womb, as the human hands develop the lines on the palm at around the 12th week of gestation and are present on a infant's hand right when it is born. The few factors that may affect the thickness or the presence of the number of lines on an individual's palm could be family history, race etc.

It is believed by many that the lines on the palms of our hand can tell our future. Many people believe in the practice of Palmistry. Fact to be told, no way one can predict the future of an individual by reading the lines on the palms of our hand.

How is Bone Marrow Formed

Bone marow

Bone marrow is a flexible, spongy tissue located within the bone interiors. This semi-solid tissue is in a jelly form and helps to produce blood cells and also protect the innermost core of the bone. The average weight of bone marrow is 4% of the individual's body weight. This gelatinous tissue fills the cavity of the bone. The bone marrow is found in the spine, hip and the shoulder bones of an adult.The richest source of bone marrow cell can be found in spine as well as hip of an individual.

Bone marrow consists of two type of cells - the Hematopoietic stem cells, which produce the blood cells and the Stromal stem cells, which can produce the cartilage, fat and the bone. Hemopoiesis is the process in which the the blood cell is produced. There are two types of bone marrow, one is the red marrow which contains the hematopoietic stem cells. The red blood cells, platelets as well as most of the white blood cells arise in red bone marrow. The red marrow mainly exists in flat bones of an individual's body such as hip bone, skull, ribs, vertebrae  and also in shoulder blades. Similarly the other type of bone marrow is the yellow marrow which houses the stroma stem cells.The presence of higher amount of fat cells give the yellow marrow it's colour. Some of the white blood cells are also developed in yellow marrow.

The formation of bone marrow in an individual takes place even before his birth. It's formation is similar to that of the formation of other organ's or tissue in one's body. Usually during birth the bone marrow is red which gets converted into yellow as one ages. Bone marrow is considered as an life saving agent for patients with severe blood loss, because the body has the tendency to convert the yellow marrow into red marrow in order to increase the blood cell production. 

How are Memories Formed in the Brain

Sources: Google images

Our brain is known to tie the sights, smells, sounds and our own impressions on certain things or moments or experiences together into a relationship. This usually happens when we experience a certain feeling, sad or happy, about someone or something. These relationships tied together by our brain helps to create memories of that particular event or episodes. Memories are categorized based on the impression they make and time it takes for that particular memory to last. Memories that last not more than a couple of milliseconds are known as working memories; whereas a memory that lasts for an hour or even a year are long term memories.

The working memory is known to provide us vivid detail of thoughts that frequently appear on our mind. But a long term memory provides a slightly blurry image of many incidents that we have experienced together. Though one can possibly hold out as many long term memory as possible, yet not each and every memory provides crystal clear details. Only those memories are regarded as important, which focus on an experience which has strong impressions on our mind. And hence it usually happens that we forget some or the other details of a particular memory at a certain point of time.