How do you calculate the medullary index of hair?
What type of medulla do humans have?
What are the three possible medulla patterns in humans?
Recall from your outline notes and handout that the medullary index is calculated by dividing the medullar width by the width of the cortex (see illustration below). Recall also that in humans the value of the medullary index is usually 0.333 or less, and that of animal hair is 0.50 or greater.
When the medulla is present in human hairs, its structure can be described as—fragmentary or trace, discontinuous or broken, or continuous. Figure 14 is a diagram depicting the three basic medullary types.
about 1.56
Deer hair has a refractive index along its length of about 1.56 and perpendicular to its length of about 1.55. It has a birefringence of about 0.01 and a positive sign of elongation.
What is the medullary index of deer hair?
1 Calculating the medullary index of hair- LAB Medullary index is calculated by dividing the medullar width by the width of the cortex (see illustration below). Recall also that in humans the value of the medullary index is usually 0.333 or less, and that of animal hair is0.50 or greater.
