polymorphous layer (medicine) and challenging (oh)

polymorphous layer (medicine)

polymorphous layer -->
fusiform layer
Layer 6 of the cortex cerebri.

Synonym: multiform layer, polymorphous layer, spindle-celled layer.

challenging (oh)

difficult in an interesting or enjoyable way
::Teaching young children is a challenging and rewarding job.
::a challenging problem
-- challengingly adv

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