Chemistry - The Human Central Nervous System Index to this...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
The Human Central Nervous System Index to this page
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
White Matter vs. Gray Matter The Meninges Cerebrospinal Fluid Blood-Brain Barrier The Spinal Cord The Hindbrain o Medulla oblongata o Pons o Cerebellum The Midbrain The Forebrain o Diencephalon o The Cerebral Hemispheres Mapping the Functions of the Brain The Electroencephalograph (EEG) Phineas P. Gage Stimulating the brain with electrodes Tomography Magnetic Resonance Imaging Magnetoencephalography (MEG) The central nervous system is made up of the spinal cord and brain The spinal cord conducts sensory information from the peripheral nervous system (both somatic and autonomic ) to the brain conducts motor information from the brain to our various effectors o skeletal muscles o cardiac muscle
Background image of page 10
o smooth muscle o glands serves as a minor reflex center The brain receives sensory input from the spinal cord as well as from its own nerves (e.g., olfactory and optic nerves ) devotes most of its volume (and computational power) to processing its various sensory inputs and initiating appropriate — and coordinated — motor outputs. White Matter vs. Gray Matter Both the spinal cord and the brain consist of white matter = bundles of axons each coated with a sheath of myelin gray matter = masses of the cell bodies and dendrites — each covered with synapses . In the spinal cord, the white matter is at the surface, the gray matter inside. In the brain of mammals , this pattern is reversed. However, the brains of "lower" vertebrates like fishes and amphibians have their white matter on the outside of their brain as well as their spinal cord. The Meninges Both the spinal cord and brain are covered in three continuous sheets of connective tissue, the meninges. From outside in, these are the dura mater — pressed against the bony surface of the interior of the vertebrae and the cranium the arachnoid the pia mater The region between the arachnoid and pia mater is filled with cerebrospinal fluid ( CSF ). The Extracellular Fluid (ECF) of the Central Nervous System The cells of the central nervous system are bathed in a fluid that differs from that serving as the ECF of the cells in the rest of the body. The fluid that leaves the capillaries in the brain contains far less protein than "normal" because of the blood-brain barrier , a system of tight junctions between the endothelial cells of the capillaries. This barrier creates problems in medicine as it prevents many therapeutic drugs from reaching the brain. cerebrospinal fluid ( CSF ), a secretion of the choroid plexus . CSF flows uninterrupted throughout the central nervous system o through the central cerebrospinal canal of the spinal cord and o through an interconnected system of four ventricles in the brain.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CSF returns to the blood through veins draining the brain. The Spinal Cord
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 28

Chemistry - The Human Central Nervous System Index to this...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online