01 Oct Match the illustration of the ?ngerprint minutiae with the correct term.
Test Your Knowledge
1. Match the illustration of the ?ngerprint minutiae with the correct term.
1Bridge
2Delta
3Trifurcation
4Dot
5Ridge Ending
6Bifurcation
7Spur
8Eye
9Double Bifurcation
10Island
2. Order the layers of the epidermis with the outermost layer on the top and the innermost layer on the bottom.
Stratum Corneum
Stratum Lucidum
Stratum Granulosum
Stratum Spinosum
Stratum Basale
3. Classify each statement as describing the epidermis or dermis.
Epidermis Dermis
1 Outermost layer of the skin 2 Inner layer of the skin
Composed of ?ve layers Contains the papillae
Contains sudoriferous gland ducts Contains the sudoriferous glands, sebaceous glands, and hair follicles
Exploration
1. Which layer of the epidermis is not always present?
Stratum Corneum
Stratum Lucidum
Stratum Granulosum
Stratum Spinosum
Stratum Basale
2. The dermal papillae form ridges on the palms of the hands and the soles of the feet.
True
False
3. Which ridge pattern is characterized by concentric circles or spirals in the center?
Arch
Spiral
Whorl
Loop
4. Every individual has a unique set of ?ngerprints.
True
False
Exercise 1
1. Describe the ?ve layers of the epidermis and each of their functions.
2. What are some of the features of the dermal papillae that you observed on this slide, and how do those features affect the surface of the skin?
3. Describe some of the structures you would expect to be present in the skin that were not visible on the prepared slide and explain why they may not have been visible on your prepared specimen.
Photo 1: Skin Layers
Photo 2: Epidermis Layers
Exercise 2
1. Were the ?ngerprints for each ?nger different or the same?
2. What is the difference between the individual ?ngerprints and when all four ?ngerprints were taken at the same time?
Photo 3: Completed Fingerprint Card
Data Table 1: Fingerprint Observations
Finger Observations
Right Thumb Whorls, DOT, Ridge Ending, Bifurcation
Right Fore?nger Whorls
Right Middle Finger loop
Right Ring Finger Whorls
Right Little Finger arch
Left Thumb Whorls
Left Fore?nger Whorls
Left Middle Finger Arch
Left Ring Finger Whorls
Left Little Finger Whorls
Competency Review
1. Dermal papillae form ?ngerprints and aid in gripping.
True
False
2. What is the thickest layer of the epidermis?
Stratum corneum
3. The epidermis is a simple epithelium.
True
False
4. When collecting a ?ngerprint, the ?nger should be pressed as hard to the paper as possible in order to produce a clean print.
True
False
5. The minutiae are studied to determine the identifying characteristics of a ?ngerprint.
True
False
6. The keratinocytes are located in the .
7. When rolling a ?ngerprint, the ?nger must be rolled from one edge of the ?ngernail to the other edge of the ?ngernail.
True
False
8. The sweat glands are also referred to as .
sebaceous glands
follicles
sudoriferous glands
none of the above
Extension Questions
1. Ever since the early 1900s, when ?ngerprints were ?rst used to identify and convict defendants, some criminals have attempted to remove or alter their ?ngerprints to avoid detection with very little success. Apply what you know about the formation of ?ngerprints in the skin to explain why ?ngerprint mutilation does not typically render very good results.
