That patch of tissue was called the apical ectoderm ridge.
A key part of this reward circuitry is the nucleus accumbens, a patch of tissue in the forebrain about the size of an almond.
Recent mathematical studies show how the size of the cellular population in a local patch of tissue influences the spread of cancer-promoting mutations.
How do we get from activity patterns in "narcissistic" sensory receptors, keyed not to "objective" environmental features but rather only to effects of the stimuli on the patch of tissue innervated, to the human ontology replete with enduring objects with stable configurations of properties and relations, types and their tokens (as the "fly-thought" example presented above reveals), and the rest?
"The brain is not wired to find an eye on the tail, since it's never happened before and thus is not something the brain has evolved specifically to deal with, and yet it can recognize this patch of tissue as providing valuable visual information," Levin said.
We used micro-aspiration (Fig. 1B C) to test this: suction was applied to a 125 µm diameter patch of tissue located between the blastopore and the equator of the embryo on the dorsal side of intact stage 11 X. laevis embryos (∼1400 µm diameter).
In our study we consider, in most cases, only a patch of tissue
And finally, growth of the ectopic eye appears to not always make use of a morphogenetic furrow suggesting that in some cases an entire patch of tissue simultaneously adopts a retinal rate, much like the area that gives rise to the first 1 4 ommatidial rows within the normal eye.
This motion makes some potentially useful microsurgeries very challenging— e.g., cutting around a single cell or patch of tissue to mechanically isolate it from a surrounding epithelium and strongly interferes with the quantitative measurement of retraction velocity after extended incisions [ 1].
Growth buds are slightly raised, discolored, triangular patches of tissue which can be found along each stem.
