What Are The 4 Medulla Patterns?

What Are The 4 Medulla Patterns? 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