Brain evolved {brain, evolution}.
brain: parts
Brain is an enlargement and opening of spinal cord cranial end. First, slight enlargement formed rhombencephalon. Then, pons (bridge) evolved. Rhombencephalon evolved to myelencephalon and metencephalon. Above pons and further forward, rostrally towards nose, is mesencephalon. From midbrain roof, special motor cerebellum evolved, first becoming large and important in birds. Fourth-ventricle top became midbrain cerebral aqueduct. Rostral to midbrain is forebrain, with diencephalon and telencephalon [Cummins and Allen, 1998].
brain: processes
Neural structures evolved first reflexes, then associations, then feature surfaces and flows, then objects and events, then scenes and trajectories, and then histories and stories over space and time using language [Cummins and Allen, 1998].
brain: tissue
Neural tissue evolved from neuron to interneuron, ganglion, ganglia group, cortex, two-layer paleocortex, four-layer neocortex, and six-layer frontal lobe cortex.
design
Neural tissue and brains evolved opportunistically and did not follow design. Brains are not evolving teleologically to defined final state. Brains do not necessarily work efficiently.
motion
Originally, sensation led directly to motion. Brain evolved to separate perception from motion. Brain further evolved to integrate perception, memory, emotion, and goals. Brain then evolved to have consciousness.
Biological Sciences>Zoology>Organ>Nerve>Brain>Evolution
4-Zoology-Organ-Nerve-Brain-Evolution
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Date Modified: 2022.0224