Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
How fingerprints are formed and why they are unique No match If two faces can be exactly similar, why can’t two fingerprints be exactly the same? Our fingerprints start developing at 10 weeks when the fetus is between 1-3 ½ inches in size Fingerprints are fully developed around 4 monthes of age Skin has 3 layers – the outside, or epidermis. The inside or dermis. And underneath the skin is the fatty tissue, called the subcutaneous tissue. Skin also contains hairs, nerves, and blood vessels epidermis Basal layer Dermis When your fingers are forming, there is a basal layer between the dermis and epidermis epidermis Basal layer Dermis The basal layer grows faster, so it strains against the other layers for space. This pressure causes the skin to buckle, forming folds of the epidermis into the dermis These folds are random These folds show up as ridges on the outer skin These ridges are also formed on the palms of hands, soles of feet, and lips! But this is not the entire story. The skin of a fetus is so soft and delicate that even the slightest touch will also create a pattern in the ridges No match So even identical twins will not have identical fingerprints! The FBI has nearly 50 million fingerprint records in its computer database and has yet to find an identical image belonging to two different people Since fingerprints are actually deep underneath the epidermis, they don’t change much as you age. The friction ridges will become less visible because aging skin gets thinner There are rare genetic conditions where people are born without fingerprints. These people typically also lack sweat glands in their skin. •Adermatoglyphia •Dermatopathia pigmentosa reticularis They cannot pick up a cardboard box or a glass! It just slips right off of their fingers! The ridges in our fingers, palms, and toes help us to grip slippery objects. New skin cells constantly being made As you can see from this image, our skin consists of a layer of dead cells on the top. New cells are constantly being made deep in the dermis. They are constantly pushed up into the epidermis, and finally slough off as dead cells on the top of our skin Use these directions to create your foldable 1. Turn paper sideways 2. Fold it in half twice 3. Fold the edges to the middle 4. Cut on solid lines Turn in for a grade! Epider mis Friction Ridges Dermis Basal Layer Hypod ermis Dermis Left Side - show the Epidermis, Dermis, and Hypodermis. Include the blood vessels, sweat glands, and nerves in your drawing Right Side - Show the dermis, basal layer, papillae, friction ridges, and sweat pores Outside 1. Age when ridges first appear and age when fingerprints fully formed. 2. What process makes the ridges, and what parts of our bodies contain these ridges 3. If the ridge pattern itself is inherited, why is it different fro each person, even twins 4. why don't fingerprints change when you age? 5. People with adermatoglyphia have trouble doing what simple thing? 6. New skin cells are formed in the ___, and move ____. the outermost surface of your skin is composed of ____ cells.