In the Present Study medulla has been classified into
Absent, Fragmented, Discontinuous and Continuous types
(Photo attached).
What are the different patterns of the medulla?
- 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 kinds of patterns can be seen in the medulla of human?
Core of the hair which can be found in many patterns like
hollow or filled, absent, fragmented, continuous, doubled, pigmented or unpigmented
.
What are the 3 medullary patterns?
If the medulla is present, its structure may be described as (L) fragmentary (or trace), (2) discontinuous (or broken), or
(3) continuous throughout the hair shaft
. 2. cellular or vacuolated (common in hairs of many animals) 3. lattice (deer family hairs).
Where is my medulla pattern?
Human medulla may be continuous, fragmented, or absent.
Determined by measuring the diameter of the medulla and dividing it by the diameter of the hair
. Medullary index for human hair is generally less than 1/3.
What type of cuticle patterns do humans have?
The 3 basic cuticle patterns are
coronal (crown-like), spinous (petal-like), and imbricate (flattened)
. Human hair is imbricate pattern.
What is a solid medulla pattern?
pigmented line unevenly spaced
(human) Describe a solid medulla pattern. Pigmented area filling both the medulla and the cortex. Describe a stacked medulla pattern.
Does all human hair contain a medulla?
The medulla, also referred to as the pith or marrow of the hair, is
the innermost layer
. Composed of round cells, this layer is normally found in thick and/or coarse hair. Naturally blonde and fine hair generally does not have a medulla.
What is an oblongata?
The medulla oblongata or simply medulla is a
long stem-like structure
which makes up the lower part of the brainstem. It is anterior and partially inferior to the cerebellum. It is a cone-shaped neuronal mass responsible for autonomic (involuntary) functions, ranging from vomiting to sneezing.
How do you describe medulla hair?
The medulla is
the innermost layer of the hair shaft
. This nearly invisible layer is the most soft and fragile, and serves as the pith or marrow of the hair.
What is the medullary index for a human hair?
Humans have a medullary index of
less than 1/3
while the medullary index of animals is greater than 1/3. However, the medulla is often fragmented or interrupted, which may result in differences in the identification of hairs from the same individual (1,2,4,8,9).
Where is nuclear DNA in hair?
In some people, traces of cell nuclei may be found in the hair itself, not only
in its root
, but this is quite rare. In most cases, nuclear DNA is broken down into its building blocks, and if a hair lacks a root, it will be impossible to extract a useful DNA sample.
Which part of the hair is most resistant to chemical decomposition?
The principal one is
cystine
, which allows strong disulfide bonds to form between protein chains. This cross-linking is what makes hair so resistant to chemical and biological degradation.
What is the human hair cuticle made of?
The hair cuticle is the outermost part of the hair shaft. It is formed
from dead cells
, overlapping in layers, which form scales that strengthen and protect the hair shaft. While the cuticle is the outermost layer, it is not responsible for the color of the hair.
What is a Vacuolated medulla?
Vacuolated. – medulla pattern. –
almost multiserial
, but with triangular or geometric shaping. – found in dogs, goats, skunks. Amorphous.
What is the deepest layer of hair?
The medulla
– the deepest layer of the hair shaft, only seen in large and thick hairs. The cortex – the middle layer of the hair shaft which provides the strength, colour and texture of a hair fibre. The cuticle – the outer layer of the hair shaft is thin and colourless.
