sistem persarafan 02 - SISTEM SARAF Pengantar Pengendali...

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SISTEM SARAF
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Pengantar Pengendali milyaran sel dalam tubuh: - Sistem saraf - cepat - Sistem endokrin - lambat
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Organ dan Pembagian Sistem Saraf Organ sistem saraf - Otak - Korda spinalis - Saraf-saraf tubuh Pembagian Sistem Saraf - Sistem saraf pusat (otak dan korda spinalis) S - Sistem saraf perifer (saraf-saraf tubuh) S Sistem saraf otonom
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Neuron Bagian-bagian dari neuron - Badan sel - Dendrit - Akson Jenis-jenis neuron - Neuron sensorik (seluruh tubuh -> korda spinalis -> otak) o - Neuron motorik (otak -> otot dan jaringan kelenjar) N - Interneuron (neuron sensorik -> neuron motorik) I
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Neuron Akson dibungkus oleh mielin Mielin dibentuk oleh Sel Schwann Takik diantara dua Sel Schwann disebut Nodus Ranvier Membran sel bagian luar dari Sel Schwann disebut Neurilemma
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Glia Glia berarti lem Fungsinya: Menjaga dan melindungi neuron Astrosit – berbentuk bintang – mendekatkan pembuluh darah dan neuron Mikroglia : pemakan mikroba Oligodendrosit : memproduksi lapisan mielin
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Saraf-saraf White matter Grey matter Akson dibungkus oleh endoneurium Kumpulan akson disebut fasikulus Fasikulus dikelilingi oleh perineurium Saraf ditutupi oleh epineurium
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Lengkung Refleks Neuron pathway Lengkung refleks: - Lengkung dua neuron: sensorik dan motorik. Contoh: refleks patella (knee jerk) C - Lengkung tiga neuron: sensorik, interneuron dan motorik Proses: rangsangan P reseptor akar ganglion posterior korda spinalis sinaps neuron motorik efektor (otot atau kelenjar)
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Impuls Saraf Definisi: gelombang gangguan listrik yang dicetuskan sendiri yang berjalan sepanjang permukaan membran plasma neuron
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Sinaps Definisi: tempat dimana impuls disalurkan dari satu neuron (presinaptik) ke neuron lain (neuron postsinaptik) ( Struktur yang membentuk sinaps: - Synaptic knob - Celah sinaps - Membran plasma neuron postsinaptik
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This note was uploaded on 10/02/2010 for the course FAKULTAS K Anfis taught by Professor Jum'atilfajar during the Spring '10 term at Universitas Indonesia.

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sistem persarafan 02 - SISTEM SARAF Pengantar Pengendali...

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