By Lakshmi Bangalore
ISBN-10: 0791089541
ISBN-13: 9780791089545
Introduces easy mind anatomy and mind improvement to highschool scholars. This booklet discusses the molecular foundation of crucial apprehensive process specification, ranging from neural induction and trend formation to neural migration, axon information, and synapse formation.
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Additional info for Brain Development (Gray Matter)
Example text
The types of signals they detect may be free floating molecules released by distant target sites, or molecules attached to the surface of nearby cells. Axon extension and dendrite elaboration, and their impact on biological development, are hotly investigated areas of research at this time. Although much progress has been made in understanding what contributes to guided axon extension, less is known about how dendrites acquire their distinct form and function. The Growth Cone About 100 years ago, the famous Spanish histologist, physician, and Nobel Prize winner Santiago Ramón y Cajal recognized that the enlarged tip of growing axons is a special 36 Wiring the Brain region where lengthening of the axon might occur.
Key Points Network connectivity within the developing nervous system is achieved through synapse formation. The synapse is a highly specialized region where nerve impulses are transferred from a neuron to its target cell. Synapse formation between a motor neuron and a muscle has been studied most extensively. During the formation of the neuromuscular synapse, molecules released by the neuron start a cascade of events that lead to the firing of a 51 52 Brain Development nerve impulse by the target cell.
By the fourth week, the three major divisions of the brain—the forebrain, midbrain, and hindbrain—have formed. 1). As development proceeds, each of the vesicles undergoes further growth and prepares to take on a specialized task. This growth and specialization reflects the overall architecture of the human brain. An embryonic brain with a bent, zigzag shape begins to emerge. After seven weeks of development, the forebrain becomes bigger than the midbrain and hindbrain. The forebrain eventually gives rise to the two cerebral hemispheres, including the thalamus and hypothalamus.
Brain Development (Gray Matter) by Lakshmi Bangalore
by Paul
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