What are three characteristics of hair that can be observed macroscopically?
Hair viewed for forensic investigations is studied both macroscopically and microscopically. Length, color, and curliness are macroscopic characteristics.
What are the 3 hair medulla types?
When the medulla is present in human hairs, its structure can be described as fragmentary or trace, discontinuous or broken, or continuous. Figure 95 is a diagram depicting the three basic medullary types.
Which protein is present in hairs?
keratin
Hair is a filamentous biomaterial consisting mainly of proteins in particular keratin.
What are the 3 microscopic layers of hair?
The hair shaft consists of three layers, from outermost to innermost: cuticle, cortex, and medulla.
How does Caucasian hair differ from African hair?
Caucasian hair is generally straight or wavy and is the thinnest, while its cross-section is relatively elliptic. As for African hair, it is very curly, its thickness is intermediate and the shape of cross-section is highly elliptic.
How do you analyze hair under a microscope?
Procedure
- Place a drop of water at the center of a microscope glass slide.
- Using a pair of forceps, place a few strands of hair onto the drop of water (or any other mountant used)
- Place the slide under the microscope and observe under low and high power.
- Compare different types of hair under the microscope.
What are the 4 types of medulla patterns?
In the Present Study medulla has been classified into Absent, Fragmented, Discontinuous and Continuous types (Photo attached).
What are the five types of medulla patterns?
Terms in this set (5)
- Continuous. one unbroken line of color.
- Interrupted/Intermittent. pigmented line broken at regular intervals.
- None. no separate pigmentation in the medulla.
- Fragmented/Segmented. pigmented line unevenly spaced.
- Solid. pigmented area filling both the medulla and the cortex.
What are the 3 stages of hair growth?
At any given time, a random number of hairs will be in one of three stages of growth and shedding: anagen, catagen, and telogen.
- Anagen. Anagen is the active phase of the hair.
- Catagen. The catagen phase is a transitional stage and about 3% of all hairs are in this phase at any time.
- Telogen.
What are the 3 common scale patterns?
There are three basic scale structures that make up the cuticle—coronal (crown-like), spinous (petal-like), and imbricate (flattened).
