Nervous System Part 2 PDF

The Nervous System Part 2 Nerve Impulses Tutor Debbie Hemington Module Biomedical Sciences GDC Learning Outcomes 1.1.5 Describe relevant and appropriate dental, oral, craniofacial and general anatomy and explain their application to patient Management 1.1.6 Describe relevant and appro...

The Nervous System Part 2 Nerve Impulses Tutor Debbie Hemington Module Biomedical Sciences GDC Learning Outcomes 1.1.5 Describe relevant and appropriate dental, oral, craniofacial and general anatomy and explain their application to patient Management 1.1.6 Describe relevant and appropriate physiology and explain its application to patient management Intended learning outcomes As for part one Assessment Formative Summative Nerve Impulse. 6 An impulse is initiated by stimulation of sensory nerve endings or by the passage of an impulse from another nerve. A nerve impulse running TO the brain and CNS is known as Afferent (sensory). A nerve impulse running FROM the brain and CNS is known as Efferent (motor).  axon to dendrite body - From cell -o 8 9 sodiumm potass as Impulse initiated by Stimulation of Sens Cry nerve endings or passage of impulse by another nerve. 10 11 Nerve impulses travel down the neurone Synaptic transmission Nerves are not joined chemical together or connected. The point at which the nerve impulse - jumps from one nerve to another = SYNAPSE Approx 1000 trillion synapses in your brain 13 Synaptic knobs contain spherical, membrane bound synaptic vesicles which store a chemical, the neurotransmitter, that is released into the synaptic cleft. 14 15 The journey of a neurotransmitter Synthesized by nerve cell bodies Actively transported along the axons Stored in the synaptic vesicles Released by exocytosis in response to the action potential Diffuse across the synaptic cleft Act on specific receptor sites on the post synaptic membrane. Action is short lived. After action, inactivated by enzymes or taken back into the synaptic knob. 16 17 in than 50 neurotransmitter More the Brain & Spinal cord : · noradrenaline · Adrenaline · Dopamine · Histamine · Serotonin · Acetylcholine. · DrugsIncrease excitability of neurons or inhibit Neurotransmitters. 18 Local anaesthetics block the nerve transmission to pain centres in the central nervous system by binding to and inhibiting the function of an ion channel in the cell membrane of nerve cells known as the sodium channel. This action obstructs the movement of nerve impulses near the site of injection, but there are no changes in awareness and sense perception in other areas. is Excessive nerve impulses can result in NEURALGIA most commonly trigeminal neuralgia. Located > The HERPES SIMPLEX VIRUS lies dormant in the TRIGEMINAL GANGLION, when re- activated it travels down the TRIGEMINAL NERVE emerging on the lip and causing a cold sore. 19 https://www.youtube.com/watch?v=OvVl8 rOEncE https://www.youtube.com/watch?v=OZG8 M_ldA1M https://www.youtube.com/watch?v=VitFv NvRIIY Apps: Thank you for listening.