bundle of axon fibers that connect to the two hemispheres Limbic System and

Bundle of axon fibers that connect to the two

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bundle of axon fibers that connect to the two hemispheres Limbic System and Basal Ganglia limbic system o hippocampus memory o amygdala emotion basal ganglia o facilitation of movement associated with Huntington’s Disease Ventricles spaces in the brain; make cerebrospinal fluid o enlarged ventricles can lead to Alzheimer’s or SZ o lack of ventricles (pushed together) can lead to tumors or swelling Meninges surround brain and spinal cord stabilize and protect the CNS o CSF flows in the subarachnoid (b/w pia and arachnoid) 3 layers o dura mater – sticks to the skull o arachnoid o pia mater – sticks to the cortex Spinal Cord and PNS Bell-Magendie Law dorsal roots sensory info ventral roots motor info Sensory neuron vs. Motor Neuron Sensory neuron o resembles a unipolar neuron (2 axons) o terminal synapses with neurons in CNS
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motor neuron o resembles a multipolar neuron o terminal synapses with muscle fibers Dermatomes a segment of skin associated with a spinal nerve o shingles is the disease associated with it Reflexes reflex: involuntary stereotyped response to sensory input stretch reflex o muscles contraction in response to a stretch knee-jerk test o monosynaptic Cranial Nerves convey info b/w the brain and head o 12 pairs Peripheral Nervous System Somatic Nervous System (afferent and efferent nerves) o In charge of what you can control and are consciously aware of o Controlled by cortex Autonomic Nervous System (efferent nerves) o Controlled by hypothalamus o Sympathetic Utilize energy easily “fight or flight” o Parasympathetic “rest and digest” Sympathetic vs Parasympathetic Sympathetic o Activated high energy states o Ganglia are near the spinal cord Preganglionic is in middle of spinal cord o Preganglionic uses acetylcholine o Postganglionic uses norepinephrine Parasympathetic o Activated in digestion o Ganglia are near targets (organs) Preganglionic is on the brainstem and sacral spinal cord o Both preganglionic and postganglionic use acetylcholine
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Work in opposition o Gut motility (PNS) and heart rate (SNS) Work unopposed o Sweat glands and limbs (SNS); pupil and bladder (PNS) Work together o Erection (PNS); ejaculation (SNS)
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