Partial Atrophy, Morphologies, Space Risk & Spinal Nerve - Rx - (udu) - 2

a) Explain the partial atrophy of the inner pupillary border tissues.
b) Explain the buttonhole & squared IPB tissues.
c) Identify the space deficiency & spinal nerve insufficiency at these multiple local absent of the IPB. Please analyse the smaller gap first such as 17', 77' & 300'-305' then 180'-195', 282'-290'.
d) Use the above findings to confirm and analyse the signs at pupillary zone and external border the collarette.