sistem saraf - spada.uns.ac.id
TRANSCRIPT
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SISTEM SARAF
drh. Wari Pawestri, M.Sc.
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Neuron dan Impuls
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Sistem Saraf
• Neurologi (neuro = saraf, logi/logos = ilmu)
• Neurologi merupakan ilmu yang mempelajari tentang saraf
• Serangkaian mekanisme kerja yang kompleks dan
berkesinambungan yang bertugas menghantarkan impuls
akibat adanya stimulus
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Sistem Saraf
• Bagian dari sistem regulasi atau koordinasi• Fungsi:MenerimaMenghantarkanMemberi tanggapan
• Sistem saraf banyak mengandug sel-sel saraf. • Sel-sel saraf tersebut merupakan neuron. • Sel saraf terdiri dari dendrit, membran sel, badan sel, nukleus atau
inti sel, akson, selubung mielin, sel schwan, nodus ranvier,danterminal akson
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Perjalanan Saraf
• Saraf keluar dari otak menuju organ-organ tubuh (mata,telinga, wajah, hidung, dan medulla spinalis)
• Dari medulla spinalis saraf diteruskan menuju bagian tubuhlebih rendah (tangan dan kaki)
• Neuron sensoris menerima rangsang dari lingkunganditeruskan ke medulla spinalis dan secara cepat diteruskanke otak
• Otak mengolah pesan dan memberikan respon• Respon diteruskan oleh neuron motoris ke tubuh
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Penghantaran Rangsang
• Rangsangan Dendrit Nukleus
Neurit Terminal
• Sinaps
• Kepala - ekor - sinaps - kepala
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Penghantaran Impuls
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Penghantaran Impuls
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Sistem Saraf
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Sistem Saraf Pusat
SSPOtak
SSB
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Sistem Saraf Pusat
Otak
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Sistem Saraf Pusat
Otak (Otak Besar/Cerebrum)
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Sistem Saraf Pusat
Otak (Otak Depan/Diensefalon)
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Sistem Saraf Pusat
Otak (Otak Kecil/Cerebellum)
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Sistem Saraf Pusat
Otak (Sumsum Lanjutan/Medula Oblongata)
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Sistem Saraf Pusat
OtakEvolusi Otak Vertebrata
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Sistem Saraf Pusat
SumsumTulang Belakang
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Sistem Saraf Pusat
SumsumTulang Belakang
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Sistem Saraf Tepi
Sistem SarafTepi
Sensoris
Motoris
Somatik
Otonom
Simpatik
Parasimpatetik
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Sistem Saraf Tepi
Sistem Saraf Sensoris (afferent)Menerima impuls dari lingkungan sekitar dan menyampaikanimpuls menuju SSP.
Sistem Saraf Motoris (efferent)Menyampaikan impuls ke efektor
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Sistem Saraf Tepi
Sistem SarafSensoris dan Motoris
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Sistem Saraf Tepi
Sistem Saraf Motoris (efferent)
SarafEfferent
Somatik
Otonom
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Sistem Saraf Tepi
Sistem Saraf Otonom
• Gerak tidak sadar
Saraf Otonom
Simpatik
Parasimpaetik
• Bekerja berlawanan (antagonis)
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Sistem Saraf Otonom
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Sistem Saraf Tepi
Sistem SarafOtonom Simpatik
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Sistem Saraf Tepi
Sistem SarafOtonom Parasimpatetik
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Terima Kasih