Jaras Olfaktori Dan Sistem Limbik
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NeuroanatomiJARAS OLFAKTORI – SISTEM
LIMBIK
Presentan: dr. Kevin GunawanPembimbing: dr. Syaiful Ichwan, Sp.BS (K)
2014
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TUJUAN
1. Mengetahui anatomi Jaras Olfaktori 2. Mengetahui anatomi Formasi
Hipokampus3. Mengetahui tentang Sistem Limbik
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SISTEM OLFAKTORI
Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.
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STRUKTUR N. OLFAKTORI
SEL RESEPTOR
1. Kemoreseptor2. Berjumlah sekitar 25 juta sel pada tiap sisi3. Terletak pada mukosa nasal4. Dapat beregenerasi5. Nukleus primernya berada pada jaras olfaktori6. Neuron bipolar, dengan akson tidak bermielin7. Pada Bulbus olfaktori, akson bersinaps dengan sel mitral
(glomerulus olfaktori)
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BULBUS OLFAKTORI
1. Pada Lamina Kribrosa Os Ethmoid2. Terdapat Saraf Olfaktori3. Terdapat 4 tipe sel :
a. Periglomerular (inhibisi)b. Tufted c. Mitral d. Granul (inhibisi)
4. Glomerulus – struktur polisinaptik, berfungsi untuk konversi impuls olfaktori pada sel mitral
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NERVUS OLFAKTORI
Ranson, Clark. The Anatomy of the Nervous System 9th Edition, Saunders Company, 1995.
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Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.
BULBUS OLFAKTORI
Mitral
Tufted
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BULBUS OLFAKTORI
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Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.
SISTEM OLFAKTORI
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Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.
SISTEM OLFAKTORI
2 cm2
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STRUKTUR N. OLFAKTORI
Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.
Traktus Olfaktori:Terletak pada sulkus olfaktoriTerdapat sel tufted dan sel mitralTerdapat struktur Nukleus Olfaktori Anterior sebagai modulator
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Anterior Perforates Substance
Stria Olfaktori MedialisMenuju Area Subkalosal dan Girus Paraterminalis
Stria Olfaktori Lateralis Menuju Korteks Olfaktori melalui limen insula amygdala, semilunar gyrus, and ambient gyrus (prepyriform area) (3rd order neuron) anterior parahippocampal gyrus (BA 28) (area proyeksi kortikal dan asosiasi sistem olfaktori).
STRUKTUR N. OLFAKTORI
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Netter, Frank H. ;2002.
Primer Pada Unkus (area 34 Brodmann).Serat berasal dari Stria Olfaktori LateralisBerisi Area Piriformis dan periamigdaloidBerhubungan dengan Nukleus Medialis Dorsalis Thalamus, Hipothalamus, dan Formasi Hipokampus
SekunderArea Entorhinal Girus Parahipokampus (area 28).Mendapat impuls dari area primerMeneruskan impuls ke hipokampus
Korteks OrbitofrontalMendapat Impuls dari Nukleus Medialis Dorsalos ThalamusPersepsi dari penghidu saat sadar
KORTEKS OLFAKTORI
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KORTEKS OLFAKTORI
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KORTEKS OLFAKTORI
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Klinis
1. Anosmia2. Halusinasi olfaktori
Lesi pada girus parahipokampus3. Foster Kennedy syndrome
• Anosmia• Optik atrofi ipsilateral• Papiledema kontralateral• Skotoma sentral ipsilateral
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SISTEM LIMBIK
Komponen :1. Lobus limbik
a. Girus cingulib. Girus
parahipokampal
c. Nukleus septalis
2. Formasi hipokampus + Forniks
3. Amigdala4. Hipotalamus 5. Talamus
(nukleus anterior)
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• Pemrosesan informasi sensoris tingkat tinggi dengan
input yang berasal dari korteks asosiasi.
• Input ini kemudian disalurkan melalui jalur sinaptik yang
berlanjut ke hippokampus.
• Sinaps-sinaps inilah yang kemudian berperan dalam
memori jangka panjang.
• Eferen sistem limbik korteks prefrontal dan hipotalamus
juga ke arah area-area kortikal yang terlibat dalam
perencanaan perilaku, termasuk respon motorik
SISTEM LIMBIK
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SISTEM LIMBIK
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GIRUS PARAHIPOKAMPUS
Medial dari lobus temporalDi antara fisura hipokampus dan sulkus kolateralBerlanjut menjadi hipokampus pada medial lobus temporal
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FORMASIO HIPOKAMPUS
Terdiri dari :
1.Kornu Ammonis (Hipokampus)
2.Subikulum
3.Girus Dentata
Ranson, Clark. The Anatomy of the Nervous System 9th Edition, Saunders Company, 1995.
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FORMASIO HIPOKAMPUS
Ranson, Clark. The Anatomy of the Nervous System 9th Edition, Saunders Company, 1995.
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FORMASIO HIPOKAMPUS
Hipokampus – Kornu Ammonis :- 3 lapisan arkikorteks
a. stratum piramidal : bersifat eferen, membentuk alveus dan fimbria hipokampus
b. stratum molekularec. stratum radiatum
Girus Dentata : - 3 lapisan :
a. Stratum Molekulareb. Stratum Granularec. Stratum Polimorfe
Subikulum (paleokorteks)a. Aferen dari hipokampusb. Eferen ke korpus mamilaris dan Nukleus Anterior Thalamus
Parasubikulum (paleokorteks)- Transisi menuju ke girus parahipokampus
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Afferen:• Entorhinal afferent fibers• Septal afferent fibers• Cingulate gyrus
Eferen:• Entorhinal cortex granule cells of
dentate gyrus (first synapse) mossy fiber system CA3 pyramidal cells recurrent Schaffer (kolateral akson CA3 pyramidal cell) CA1 pyramidal cells
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Papez Circuit
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Papez Circuit
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Papez Circuit
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KOMPLEKS AMYGDALA
Aferen : Bulbus olfaktori, korteks Olfaktori, lobus piriformis, nukleus solitariusEferen : stria terminalis, septal area, batang otak, medulla spinalis
Waxman, Stephen; Clinical Neuroanatomy, Lange 24th Ed; 2003.
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AMYGDALA
a. Nukleus KortikomedialJaras aferen dari bulbus olfaktori melalui stria olfaktori lateralis
b. Nukleus BasolateralJaras aferen dari dorsal talamus, korteks prefrontal, girus parahipokampus, girus cinguli, korteks insula, subikulum
-Waxman, Stephen; Clinical Neuroanatomy, Lange 24th Ed; 2003.
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AMYGDALA
Jaras eferenDari stria terminalis – dimulai dari bagian rostromedial amygdala melewati bagian antara nukleus kaudatus dan thalamus menuju :
Area Prekomisura Nukleus Septal
Area Postkomisura Hipotalamus
Area PreoptikNukleus Ventromedial
-Waxman, Stephen; Clinical Neuroanatomy, Lange 24th Ed; 2003.
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NUKLEUS ANTERIOR THALAMUS
-Mendapat impuls dari nukleus mamilare-Penghubung utama sistem Limbik
-Waxman, Stephen; Clinical Neuroanatomy, Lange 24th Ed; 2003.
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Fungsi
Amigdala inhibisi perilaku, integrasi sensorikHipokampus memori (jangka panjang)Girus cingulum perilaku insting, ikatan sosial, reasoning, regulasi denyut jantung dan tekanan darahHipotalamus regulasi ANS, rasa haus, seksual, siklus tidur bangun, motivasiFornix membawa sinyal dari hipokampus ke korpus mamilaris dan nukleus septalisNukleus septalis proses pembelajaranKorpus mamilaris recall
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Fungsi
Girus dentata berkontribusi terhadap memori baru dan regulasi rasa senangKorteks entorhinal dan piriformis penerima input
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TERIMA KASIH
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DAFTAR PUSTAKA
-Waxman, Stephen; Clinical Neuroanatomy, Lange 24th Ed; 2003.-Bergman, Ronald A. Functional Neuroanatomy; McGraw Hill, 1998. -Netter, Frank H. Atlas of Neuroanatomy and Neurophysiology;2002.-Ranson, Clark. The Anatomy of the Nervous System 9th Edition, Saunders Company, 1995.