The ratio of the diameter of the medulla to the diameter of the entire hair is known as the medullary index. If the medullary index is 0.5 or greater, the hair came from an animal. If the medullary index is 0.33 or less, the hair is from a human.Click to see full answer. Considering this, what is the medullary index?The medullary index is defined as the ratio between the diameter of medulla and the diameter of the entire hair, medullary index = (medulla diameter) / (hair diameter) (this is a dimensionless unit). It is known that a human’s medulla is considerably thinner than an other animal’s one. what factors are used to calculate the medullary index of the hair? a) scale diameter of cuticle and the length of the hair b) width of cortex and the width of the medulla c) length of entire hair and the pattern of pigmentation d) width of medulla and the width of the hair. Just so, how do you determine the medullary index? 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. your work.Why is the medulla useful in species identification?The cortex gives hair its color, the cuticle is useful to identify species and the medulla is the central canal. In the image below show the medulla patterns for various types of hairs. To identify different species of hair, it is necessary to look at the medulla pattern to determine the origin of the hair.
ncG1vNJzZmivp6x7pLHLnpmroaSesrSu1LOxZ5ufonuotI6wn5qsXZ7AbsDHnmSmnZSqua2t0bJkoqaUmsVuwdKem2aen6d8