Ch18 Pattern Formation – Regeneration Types of Regeneration: 1.Stem Cells (undifferentiated) 2.Morphallaxis 3.Epimorphosis 4.Compensatory Regeneration.

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Presentation transcript:

Ch18 Pattern Formation – Regeneration Types of Regeneration: 1.Stem Cells (undifferentiated) 2.Morphallaxis 3.Epimorphosis 4.Compensatory Regeneration (differentiated)

Pattern Formation Regeneration Epimorphosis

Regeneration Epimorphosis Limb regeneration - Blastema What is necessary for limb regeneration? Denerve then amputated  ? Amputation  add NGF  ? Nerve transplants in animals which normally lack regeneration: Newborn Opposum 1. Hindlimb Amputation  ? 2.Supplemental nerve tissue  ?

Epimorphosis

Hydra freshwater cnidarian Morphallaxis

Hydra – regeneration gradients Head Activator vs. Head Inhibitor both from Hypostome Budding - level of HA at gastric bud Role of nerves

Compensatory Regeneration