Download Forensics Hair Lab

Name____________________________________________ Date_________________
Anatomy and Physiology Skin and Hair Microscope Lab
Objective: To create a series of sketches that can show the anatomy of human skin cells
and human hair, tot understand the many differences of hair within the human species.
and the uniqueness of fingerprints.
Procedure for skin cells
1. Look at the prepared slides of squamous epithelium cells and simple cuboidal
epithelium.
2. Sketch each type under high power. Label the parts that are visible under the
microscope.
3. Under each drawing label the type of cells, the magnification AND where on the
body these types of cells are found.( you may use any book or the internet for
this information)
Procedure for hair
1. Pull out a head hair of your own by the root.
2. Sketch hair and root in highest power possible. Sketch the cuticle scales.( 2
different sketches)
3. Label all visible parts.
4. Calculate Medullary ratio. Medullary Ratio is the diameter of the medulla
divided by the diameter of the hair, expressed as a fraction.
5. Repeat for eyebrow hair. Note specific differences in both.
6. View 1 other human hair samples. ( different color, dyed hair)
7. Include a caption including magnification and identity at the base of each sketch.
Fingerprints
Fingerprints are produced by the ridges in the skin on the tips of fingers (also found on
toes, palms, and soles of feet. The pattern of these ridges are different in everybody
and appear during the fourth month of fetal development. The ridges are caused by the
dermal papilla which interlock the epidermal and dermal layers of the skin. There are
small pores evenly spaced along the ridges. Glands secrete sweat through these pores.
The sweat contains oil that is left on things we touch and result in the fingerprint.
Study the examples of the major fingerprint patterns shown below.
Write a hypothesis for the following question: How many different major fingerprint
patterns do you exhibit?
Materials:
Stereo Microscope
Fingerprint Ink
Scratch paper
Soap & Paper Towels
Human Anatomy & Physiology pgs. 166
Procedure: & Questions:
Part A:
Wash and dry your hands. Place your finger, anterior surface up, on the stage of a
stereo microscope and use the spotlight (not the substage light). Adjust the
magnification so that the surface of your finger is clearly observed
Questions: (Please write both question and answers in your lab journal.)
1. What specific layer of the skin are you looking at? Be specific.
2. What material in this outer layer of skin makes it so tough?
3. What skin structure is responsible for the ridges you see?
4. What purpose might these ridges serve?
While looking at your finger under the microscope, push down on your skin a few times.
The skin should appear firm but not hard or brittle.
5. How does this characteristic aid in the function of the fingers?
You should be able to observe small indentations spread evenly along the ridges.
6. What are these and what is their function? (see intro.)
Anatomy and Physiology Skin Hair Lab 4/30/17
Lawson
Part B:
Procedure
“Ink” each finger and roll you finger on an index card. Identify each type of print. See
Lawson for demonstration
Questions: (Please write both question and answers in your lab journal.)
7. Compare your prints with the examples in the introduction. What types of prints
do you have? (Be sure to identify each of your prints on the fingerprint form.)
8. Look at your fingerprints again. Are there any visible scars or other irregularities
in skin structure? If so, on which finger?
9. Compare and contrast sebaceous and sweat glands in detail.
10. Refer to your hypothesis .Was your hypothesis correct? Why or why not?
Write up:
6 total sketches.
Describe differences between your head hair and eyebrow hair.
Read pp. 170-173 write a short summary of hair loss ( p. 172) Include terms for hair loss.
Please do this in your lab book. Please take time and care with your sketches.
Lab Score 35 possible points.
Anatomy and Physiology Skin Hair Lab 4/30/17
Lawson
Name_________________________________________________Date______________
Skin and Hair Lab Microscope Investigation Rubric
Points
Exemplars sketched and labeled correctly
Squamous ( Where)
3
Cuboidal ( Where)
3
Hair ( MR)
3
Eyebrow (MR)
3
Friend hair (MR)
3
Difference in head and eyebrow hair
3
Hair Loss write up
2
Fingerprint hypothesis and response
5
Fingerprint cards with identification
5
10 Questions answered
5
Total
35
Comments:
Name_________________________________________________Date______________
Skin and Hair Lab Microscope Investigation Rubric
Points
Exemplars sketched and labeled correctly
Squamous ( Where)
3
Cuboidal ( Where)
3
Hair ( MR)
3
Eyebrow (MR)
3
Friend hair (MR)
3
Difference in head and eyebrow hair
3
Hair Loss write up
2
Fingerprint hypothesis and response
5
Fingerprint cards with identification
5
10 Questions answered
5
Total
35
Comments:
Anatomy and Physiology Skin Hair Lab 4/30/17
Lawson