The nervous system
... The soma (cell body) is the central part of the neuron. It contains the nucleus of the cell, and therefore is where most protein synthesis occurs. The nucleus ranges from 3 to 18 micrometers in diameter. The dendrites of a neuron are cellular extensions with many branches, and metaphorically this o ...
... The soma (cell body) is the central part of the neuron. It contains the nucleus of the cell, and therefore is where most protein synthesis occurs. The nucleus ranges from 3 to 18 micrometers in diameter. The dendrites of a neuron are cellular extensions with many branches, and metaphorically this o ...
Nervous System
... Gray and white matter. 4. Electrical signals in neuron. Ion channels Resting membrane potential (RMP) Graded potential. Action potential. ...
... Gray and white matter. 4. Electrical signals in neuron. Ion channels Resting membrane potential (RMP) Graded potential. Action potential. ...
WARM UP 4/20
... brain that will be on your quiz. After each, write down a little note for you to remember where the part is. EX: gyri - ridges pons – bump near bottom of brain ...
... brain that will be on your quiz. After each, write down a little note for you to remember where the part is. EX: gyri - ridges pons – bump near bottom of brain ...
NEURONS
... 3. ___________________________the long cytoplasmic extension of the cell body; the nerve 1. ___________________________- the large part of the neuron that contains the nucleus. ...
... 3. ___________________________the long cytoplasmic extension of the cell body; the nerve 1. ___________________________- the large part of the neuron that contains the nucleus. ...
Chapter 2 Notes
... • Resting Potential: Electrical charge of an inactive neuron • Threshold: • Action Potential: A nerve impulse; Primarily an electrical process; Gates or channels in the axon membrane pop open, allowing sodium ions to rush into the axon; This process continues along the length of the axon. ...
... • Resting Potential: Electrical charge of an inactive neuron • Threshold: • Action Potential: A nerve impulse; Primarily an electrical process; Gates or channels in the axon membrane pop open, allowing sodium ions to rush into the axon; This process continues along the length of the axon. ...
One difference between axons and dendrites is that
... A. fatty substance that wraps around some axons. B. hormone secreted by the pituitary gland. C. protein component of the tangles seen in Alzheimer's disease. D. small molecule neurotransmitter. An action potential just traveled down to the tip of an axon. What will it do next? A. It will "jump" to t ...
... A. fatty substance that wraps around some axons. B. hormone secreted by the pituitary gland. C. protein component of the tangles seen in Alzheimer's disease. D. small molecule neurotransmitter. An action potential just traveled down to the tip of an axon. What will it do next? A. It will "jump" to t ...
CHAPTER 12 AND 13 OUTLINE
... • • Indolamines – serotonin and histamine • • Broadly distributed in the brain • • Play roles in emotional behaviors and our biological clock Synthesis of Catecholamines • • Enzymes present in the cell determine length of biosynthetic pathway • • Norepinephrine and dopamine are synthesized in axonal ...
... • • Indolamines – serotonin and histamine • • Broadly distributed in the brain • • Play roles in emotional behaviors and our biological clock Synthesis of Catecholamines • • Enzymes present in the cell determine length of biosynthetic pathway • • Norepinephrine and dopamine are synthesized in axonal ...
Nervous System
... the nucleus and organelles 2. dendrites- short, branching extensions spreading out from the cell body; receive and carry impulses to the cell body 3. axon- long, fibrous part of neuron; conducts nerve impulses away from cell body 4. at the end of the axon, the impulse travels across the synapse, a t ...
... the nucleus and organelles 2. dendrites- short, branching extensions spreading out from the cell body; receive and carry impulses to the cell body 3. axon- long, fibrous part of neuron; conducts nerve impulses away from cell body 4. at the end of the axon, the impulse travels across the synapse, a t ...
Nervous System Lecture- Part II
... Paired spinal nerves extending from spinal cord Peripheral nerves link all regions of the body to the CNS Ganglia are clusters of neuronal cell bodies ...
... Paired spinal nerves extending from spinal cord Peripheral nerves link all regions of the body to the CNS Ganglia are clusters of neuronal cell bodies ...
Ch 48 Notes - FacStaff Home Page for CBU
... Motor output leaves the brain or ganglia via motor neurons, which trigger muscle or gland activity ...
... Motor output leaves the brain or ganglia via motor neurons, which trigger muscle or gland activity ...
Slide 1
... Each branch of this arborization terminates on the next cell in dilatations called end bulbs (boutons), which interact with other neurons or nonnerve cells, forming structures called synapses. ...
... Each branch of this arborization terminates on the next cell in dilatations called end bulbs (boutons), which interact with other neurons or nonnerve cells, forming structures called synapses. ...
Nervous System Study Guide
... 6. Identify what a synapse is and how two joined neurons overcome a synapse. A synapse is the gap between two neurons. The nerve impulse travels as an electrical impulse through the neuron. However, the nerve impulse becomes a chemical impulse as it travels across the synapse. 7. What is an “impulse ...
... 6. Identify what a synapse is and how two joined neurons overcome a synapse. A synapse is the gap between two neurons. The nerve impulse travels as an electrical impulse through the neuron. However, the nerve impulse becomes a chemical impulse as it travels across the synapse. 7. What is an “impulse ...
Nerve Cells
... Myelination is the development of a myelin sheath about a nerve axon. The myelin sheath is an outgrowth of neighboring glial (Schwann) cell plasma membrane about the axon that repeatedly wraps itself around the neural extension until all the cytosol between the layers of membrane is forced out. The ...
... Myelination is the development of a myelin sheath about a nerve axon. The myelin sheath is an outgrowth of neighboring glial (Schwann) cell plasma membrane about the axon that repeatedly wraps itself around the neural extension until all the cytosol between the layers of membrane is forced out. The ...
Practice Exam 1
... 10) True or False? In figure 1, if the permeability of Na+ is changed, its equilibrium potential will also change. A) True. B) False. 11) The cerebellum… A) acts as a relay station, filtering all sensory information before it reaches higher brain areas. B) is mainly responsible for processing smell ...
... 10) True or False? In figure 1, if the permeability of Na+ is changed, its equilibrium potential will also change. A) True. B) False. 11) The cerebellum… A) acts as a relay station, filtering all sensory information before it reaches higher brain areas. B) is mainly responsible for processing smell ...
Chapter 17: Nervous System - Johnston Community College
... The nervous system is divided into a central nervous system (CNS), consisting of the brain and spinal cord, and a peripheral nervous system (PNS), consisting of nerves carrying sensory and motor information between the CNS and muscles and glands. Both systems have two types of cells: neurons that tr ...
... The nervous system is divided into a central nervous system (CNS), consisting of the brain and spinal cord, and a peripheral nervous system (PNS), consisting of nerves carrying sensory and motor information between the CNS and muscles and glands. Both systems have two types of cells: neurons that tr ...
the nervous system
... How does it do it? • Cells carry messages from one part of the body to another • The messages in the nervous system are electrical signals called impulses • The cells that transmit the impulses are called neurons – Made of: • Dendrite • Axon • Myelin Sheath ...
... How does it do it? • Cells carry messages from one part of the body to another • The messages in the nervous system are electrical signals called impulses • The cells that transmit the impulses are called neurons – Made of: • Dendrite • Axon • Myelin Sheath ...
File
... the soon-to-be-mentioned ‘gates’ that open during an action potential). The pump acts to continuously correct leakage. iii. There exist plenty of large anions within the neuron (proteins, amino acids, sulfate, phosphate), which cannot move out of the cell (either too large or possessing no specific ...
... the soon-to-be-mentioned ‘gates’ that open during an action potential). The pump acts to continuously correct leakage. iii. There exist plenty of large anions within the neuron (proteins, amino acids, sulfate, phosphate), which cannot move out of the cell (either too large or possessing no specific ...
Central Nervous System
... Gray matter – cell bodies and unmylenated fibers Nuclei – clusters of cell bodies within the white matter of the central nervous system Ganglia – collections of cell bodies outside the central nervous system ...
... Gray matter – cell bodies and unmylenated fibers Nuclei – clusters of cell bodies within the white matter of the central nervous system Ganglia – collections of cell bodies outside the central nervous system ...
Feb. 11
... – Principle of connectional specificity: neurons make specific connections at precise points of synaptic contact. ...
... – Principle of connectional specificity: neurons make specific connections at precise points of synaptic contact. ...
Slide 1
... Olfactory receptors influence the targeting of sensory axons to discrete glomeruli in the olfactory bulb. (Adapted, with permission, from Sanes and Yamagata 2009.) A. Each olfactory receptor neuron expresses one of approximately 1,000 possible odorant receptors. Neurons expressing the same receptor ...
... Olfactory receptors influence the targeting of sensory axons to discrete glomeruli in the olfactory bulb. (Adapted, with permission, from Sanes and Yamagata 2009.) A. Each olfactory receptor neuron expresses one of approximately 1,000 possible odorant receptors. Neurons expressing the same receptor ...
Slide ()
... Olfactory receptors influence the targeting of sensory axons to discrete glomeruli in the olfactory bulb. (Adapted, with permission, from Sanes and Yamagata 2009.) A. Each olfactory receptor neuron expresses one of approximately 1,000 possible odorant receptors. Neurons expressing the same receptor ...
... Olfactory receptors influence the targeting of sensory axons to discrete glomeruli in the olfactory bulb. (Adapted, with permission, from Sanes and Yamagata 2009.) A. Each olfactory receptor neuron expresses one of approximately 1,000 possible odorant receptors. Neurons expressing the same receptor ...
Essentials of Human Anatomy
... • Stages of repair of an axon in a peripheral motor neuron – Following injury, distal portion of axon and myelin sheath degenerates – Macrophages remove the debris – Remaining neurilemma and endoneurium form a tunnel from the point of injury to the effector – New Schwann cells grow in the tunnel to ...
... • Stages of repair of an axon in a peripheral motor neuron – Following injury, distal portion of axon and myelin sheath degenerates – Macrophages remove the debris – Remaining neurilemma and endoneurium form a tunnel from the point of injury to the effector – New Schwann cells grow in the tunnel to ...
Nervous System (1)
... the body, outside the CNS The PNS is made up of two subdivisions 1. Somatic Nervous System - Nerves that control voluntary muscles of the skeleton 2. Autonomic Nervous System - Nerves that control cardiac muscle, glands, peristalsis etc. (Considered to be an involuntary system) ...
... the body, outside the CNS The PNS is made up of two subdivisions 1. Somatic Nervous System - Nerves that control voluntary muscles of the skeleton 2. Autonomic Nervous System - Nerves that control cardiac muscle, glands, peristalsis etc. (Considered to be an involuntary system) ...
Axon
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An axon (from Greek ἄξων áxōn, axis), also known as a nerve fibre, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands. In certain sensory neurons (pseudounipolar neurons), such as those for touch and warmth, the electrical impulse travels along an axon from the periphery to the cell body, and from the cell body to the spinal cord along another branch of the same axon. Axon dysfunction causes many inherited and acquired neurological disorders which can affect both the peripheral and central neurons.An axon is one of two types of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites. Axons are distinguished from dendrites by several features, including shape (dendrites often taper while axons usually maintain a constant radius), length (dendrites are restricted to a small region around the cell body while axons can be much longer), and function (dendrites usually receive signals while axons usually transmit them). All of these rules have exceptions, however.Some types of neurons have no axon and transmit signals from their dendrites. No neuron ever has more than one axon; however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other. Most axons branch, in some cases very profusely.Axons make contact with other cells—usually other neurons but sometimes muscle or gland cells—at junctions called synapses. At a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap. Some synaptic junctions appear partway along an axon as it extends—these are called en passant (""in passing"") synapses. Other synapses appear as terminals at the ends of axonal branches. A single axon, with all its branches taken together, can innervate multiple parts of the brain and generate thousands of synaptic terminals.