Different types of medullas:
- Interrupted medulla (medulla is slightly broken)
- Fragmented medulla (medulla is broken up into pieces)
- Continuous medulla (no break in the medulla)
- Absent medulla (no medulla is present)
Medullary Index: is used to distinguish animal hair from human hair.
Diameter of medulla
Diameter of hair
Diameter of medulla
Diameter of hair