spinal cord. The spinal cord communicates with all the sense organs and muscles except those of the head. It is compromised of grey matter which is densely packed with cell bodies and dendrites and white matter which consists mostly of myelinated axons. According to the Bell-Magendie law‚ the entering dorsal roots carry sensory information and the exiting ventral roots carry motor information. Each segment sends sensory information to the brain and receives motor commands from the brain. The brain
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Sample ‘short answer’ questions for Lecture Exam 4 (Final Exam) (1) Briefly describe the meninges and spaces that surround the spinal cord. Meningeal Branch: Tiny‚ reenters vertebral canal‚ innervates meninges and blood vessels (2) Distinguish among exteroceptors‚ interoceptors and proprioceptors. Exteroceptors: Respond to stimuli arising outside body Receptors in the skin for touch‚ pressure‚ pain‚ and temperature Most special sense organs (vision‚ hearing‚ equilibrium‚ taste‚ smell) Interoceptors:
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regulates cell functioning dendrites: the branching part of the neuron that receives messages from other neurons and relays them to the cell body Structure of the Neuron axon: the long‚ cable-like extension that delivers messages to other neurons myelin sheath: layer of fatty tissue that insulates the axon and helps speed up message transmission multiple sclerosis: deterioration of myelin leads to slowed communication with muscles and impaired sensation in limbs terminal button:
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I.Abstract Guillain-Barre Syndrome (GBS) is an auto-immune disease that is rare but can lead to paralysis of limbs and the diaphragm. Ventilatory failure is commonly seen in patients with progressing diseases. The causes of GBS syndrome is unknown‚ however a few culprits are being studied. The most common explanation for GBS is the demyelination of the peripheral nervous system. Other causes in question include flu vaccinations and certain bacteria such as Campylobacter Jejuni. Patients diagnosed
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Although you know your teenager takes some chances‚ it can be a shock to hear about them. One fine May morning not long ago my oldest son‚ 17 at the time‚ phoned to tell me that he had just spent a couple hours at the state police barracks. Apparently he had been driving "a little fast." What‚ I asked‚ was "a little fast"? Turns out this product of my genes and loving care‚ the boy-man I had swaddled‚ coddled‚ cooed at‚ and then pushed and pulled to the brink of manhood‚ had been flying down the
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Neurophysiology Study Guide 1. Define "equilibrium potential". Why is the resting potential closer to the potassium equilibrium potential (EK+) than the sodium potential (ENa+)? The equilibrium potential is the point at which the force exerted on an ion by electrostatic and concentration gradient forces are balanced‚ and there is no net movement of that ion. The resting potential is closer to EK+ than ENa+ because the cell membrane is more permeable to
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Exam 3 Review Sheet Genetics terms: phenotype‚ genotype‚ allele‚ dominant‚ recessive‚ homozygous‚ heterozygous‚ multiple alleles‚ codominance Phenotype: physical appearance Genotype: genetic composition Allele: alternate form of a gene Dominant: trait that will be expressed Recessive: trait that will be masked by dominant trait Homozygous: both alleles are the same Heterozygous: the alleles are different Multiple Alleles: Codominance: Sex determination – all possibilities Xyy: Xxy
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The Chemistry of Drugs Delta 9 Tetrahydrocannabinol is the primary psychoactive constituent of Cannibis sativa‚ and is bound to two cannabinoid receptors: CB1 receptors‚ located primarily in the brain‚ and CB2 receptors‚ located primarily in the periphery (Wiley & Martin 2002). A cannabinoid is defined as a substance that has pharmacological properties that resemble those of delta 9 THC i.e. " a drug that binds to CB1 and /or CB2 receptors in vitro and produces a profile of in vivo
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central nervous system. It can be either a voluntary activity from the brain or a reflex activity from the spinal cord. An action potential passes outward in a ventral root of the spinal cord as a motor neuron in the ventral horn is stimulated. The axon branch to supply numerous muscle fibers or motor units and the action potential is carried to a motor end plate on each muscle fiber. Then the action potential releases quanta of acetylcholine into the synaptic clefts on the surface of the muscle fiber
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tools which are responsible for most of the brain’s function. It is divided into four sections: the temporal lobe‚ the occipital lobe‚ parietal lobe and frontal lobe. The cerebrum is divided into a right and left hemisphere which are connected by axons that relay messages from one to the other. This matter is made of nerve cells which carry signals between the organ and the nerve cells which run through the body. Frontal Lobe: The frontal lobe is one of four lobes in the cerebral hemisphere. This
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