{"type":"video","version":"1.0","html":"<iframe src=\"https://www.loom.com/embed/809101acffd04e07a41a8116794e18b4\" frameborder=\"0\" width=\"1662\" height=\"1246\" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>","height":1246,"width":1662,"provider_name":"Loom","provider_url":"https://www.loom.com","thumbnail_height":1246,"thumbnail_width":1662,"thumbnail_url":"https://cdn.loom.com/sessions/thumbnails/809101acffd04e07a41a8116794e18b4-9d45c45bba1d7ec2.gif","duration":2308.41,"title":"Nervous System Overview, Neurons, and Brain Anatomy","description":"This Loom reviews core nervous system anatomy, histology, and physiology with emphasis on how neural signals are transmitted. It divides the nervous system into central (brain and spinal cord) and peripheral nerves, then explains afferent sensory input and efferent motor output to effector tissues, including somatic and autonomic motor pathways. The speaker describes neuron structure and function, including dendrites, soma, axon hillock, myelin sheath with nodes of Ranvier, and neuron types by shape and function. It also covers neuroglia such as astrocytes, oligodendrocytes versus Schwann cells, microglia, and ependymal cells, plus gray versus white matter and major brain regions and meninges. Finally, it outlines spinal cord landmarks, lumbar puncture safety around L4 to L5, spinal nerve roots, plexuses, and cranial nerves, concluding with how reflex arcs bypass the brain through spinal cord integration."}