MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) In the spinal cord‚ white matter is organized into ascending and descending tracts grouping into A) nuclei. B) nerves. C) columns. D) ganglia. E) horns. 2) Enlargements of the spinal cord occur A) adjacent to the anterior median fissure. B) in the filum terminale. C) near the posterior median sulcus. D) in segments of the spinal cord that control the limbs. E) in the thoracic
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Introduction and Objective The action potential is an impulse of electrical activity. Action potential occurs when a neuron sends messages electrochemically down an axon called a nerve impulse. When a neuron is not stimulated or inactive‚ it is at resting potential. When a neuron is at rest‚ the electrical charge on the inside of the neuron is negative while the electrical charge on the outside of the neuron is positive. The resting membrane potential of a neuron is about -70 mV (mV = millivolts)
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The figure illustrates the parasympathetic division. What does "A" represent? cranial nerves The figure illustrates the parasympathetic division. What does "C" represent? terminal ganglia The figure illustrates the parasympathetic division. What does "E" represent? pelvic nerves parasympathetic effects more localized increases activity of GI tract effects are short-lived provides more extensive innervation of G.I. Tract craniosacral division functions at rest sympathetic effects are more general
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when the roots of the sciatic nerve are cut * As we cut the root of the right sciatic nerve of the frog in the experiment‚ the right lower leg of the frog becomes limp. The right gastrocnemius muscle lost its firmness and becomes flabby while I have observed as we compared the tonicity of the muscles with the left gastrocnemius muscle (with the root of left sciatic nerve is still intact) it is different. The left gastrocnemius muscle remains firm with the sciatic nerve connected. This observation
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cream/shampoo 2x week for 4 weeks CHICKEN POX/SHINGLES Zovirax Peds 20mg/kg qid #20 adult 800mg qid #20 TOPICAL STEROIDS Elocon 0.1% q day 15grams LICE Kwill thin layer massage in & wash off in 8-12hr wash all clothes BURNS Silvadeen bid to burn 50g TRIGEMINAL NEURALGIA Tegretol 100mg bid w/meals MIGRANES Iimitrex 6mg IM repeat in 1 hour if effective- Depakote- Dubaine- demerol & phenergan- Midrin 2 initially then 1 q half hr max 5/12hrs- Inderal 40mg bid range 160-240mg/day- Stadol NS (inhal) 1 spray
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is an area of skin that is mainly supplied by a single spinal nerve. There are eight cervical nerves (C1 being an exception with no dermatome)‚ twelve thoracic nerves‚ five lumbar nerves and five sacral nerves. Each of these nerves relays sensation (including pain) from a particular region of skin to the brain. Along the thorax and abdomen the dermatomes are like a stack of discs forming a human‚ each supplied by a different spinal nerve. Along the arms and the legs‚ the pattern is different: the
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external structure of the eyeball. The external layer of the eyeball is formed by the cornea‚ and the sclera. The cornea is a dome-shaped structure. The cornea does not have any blood vessels that is why it appears clear. The cornea does have nerves. The cornea is the first and most powerful lens in the eye’s optical system. The cornea is the first part of the eye to focus. When a ray of light hits the eye‚ the cornea is the first structure the light encounters. Then the light rays travel
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Picking up a box from the floor and placing it on a shelf Light entering the eye forms an upside-down image on the retina. The retina transforms the light into nerve signals for the brain. The brain then turns the image right-side up and tells us what we are seeing. Our brain then computes to pick up the box. When a message comes into the brain from anywhere in the body‚ the brain tells the body how to react. the brain as a central computer that controls all bodily functions‚ then the nervous
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nervous system is comprised of all nerves and nerve pathways that are outside the brain and spinal cord. Neuropathy can develop gradually or suddenly‚ and symptoms vary in severity among individuals. Peripheral Neuropathy can be broadly categorized by the 1) type of nerve that has been damaged‚ 2) location of nerve damage in the body or 3) disease process that causes it. In some cases‚ the cause cannot be identified. Types: There are three main types of peripheral nerves:
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your observations through the microscope of the neuron‚ the ox spinal cord smear‚ and the teased myelinated nerve. Answer these Questions: A. What is the functional difference between a neuron and a nerve? A neuron is a nerve cell and is a basic building block of the nervous system. Neurons also have special functions‚ like transmitting information throughout the body. A nerve is a bundle of neuron cells. B. What gives a multipolar neuron its name? A multipolar neuron contains several
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