Bio Notes February 10

Bio Notes February 10 - Bio Notes Human Brain and Spinal...

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Bio Notes February 10, 2009 Human Brain and Spinal Cord Protected by bone and 3 meninges (connective tissue) o Outer dura mater o Middle arachnoid o Inner thin and vascular pia mater Meningitis- inflammation of meninges Cushioned by cerebrospinal fluid (CSF) o Nutrients and waster products between blood and brain are exchanged o Produced by choroids plexi in walls of ventricles o Fluid circulates through ventricles (cavities) and subarachnoid space o Continuously produced and reabsorbed o CSF is a shock absorber Spinal Cord Structure o Gray matter Serves as reflex center Contains large cell bodies Dendrites Demyelinated axons Glial cells o White matter Consists of myelinated axons in bundles or tracts o Cord transmits impulses to and from brain o Ascending tracts Transmits info to brain o Descending tracts (bundles of axons) Transmit info from brain to motor neurons in the cord o Withdrawal reflex Reception- Sensory receptor signals sensory neuron (depolarization down the sensory neuron) Transmission- sensory neuron transmits signals to CNS Integration- interneuron integrates information Transmission- appropriate motor neuron transmits impulses to muscle Action by effector- muscle contracts moving hand away from flame (actual response) Human Cerebrum 41-2 41-10, 41-11 Human Cerebral Cortex o Right and left cerebral hemisphere o Consists of gray matter Forms folds (convolutions)
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o Fissures Deep furrows in brain o Sensory areas Receive incoming sensory information Sensory homunculus: Anterior region of parietal lobe o Reflects the relative amount of cerebral cortex that receives incoming sensory information from each sense organ (larger portion) o Motor areas Control voluntary movement Motor homunculus Posterior region of the frontal lobe o More of the cerebral cortex is devoted to controlling body structures capable of skilled body movement, and coordinated movement of many muscle groups o Association areas Link sensory and motor areas Responsible for learning, language, though, judgment Integration areas o Cerebrum consists of lobes Frontal lobe Motor and skeletal muscle associated areas Parietal Somatosensory area receives information regarding touch… Temporal Lobes Centers for hearing- sensation of noise Remove the lobe= lose of hearing Remove a piece of the lobe- hearing decreases Occipital Lobe Visual centers Remove lobe= blindness o White matter
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Bio Notes February 10 - Bio Notes Human Brain and Spinal...

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