6.Fisiologi Reflex
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Transcript of 6.Fisiologi Reflex
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Reseptor & Fisiologi reflex
Ch.Effendi - Lab. I.Faal FK UNAIR
Edited by akmarawita kadir, Lab Faal FK UWKS
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Reflex
merupakan dasar
Mekanisme kerja sistem SARAF
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Reflex(reaksi dari alat tubuh terhadap adanya rangsangan,
disadari maupun tidak)
RGS
RECEPTOREFFERENT
Afferent
Saraf Pusat
EFFECTORmuscle
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Medullaspinalis
Receptor
Sensoris
Motorik
Effektor
Komponen yang membentuk Reflex
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Reflex
Fisiologis Patologis
Somatik Otonomik
BABINSKI, CHADDOCK, GORDON
SALIVASI, LAKRIMASI, BATUK, BERSIN, MENELAN, BAROREFLEX, CHEMOREFLEX, RESPIRASI
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Reflex Somatik
Monosynaptic
PolysynapticREFLEX PALING SEDERHANA MYOTATIC = STRETSC REFLEX
ADEKUAT STIMULUS KONTRAKSI OTOT.
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Reflex Fisiologis Somatik
•Monosinap
•single sinap di
•anterior motorneuron
•contoh :
•Patella reflex
•Achilles reflex
•Biceps reflex
•Triceps reflex
•Polisinap
•sinap lebih dari 1
•contoh :
•Flexor reflex
•Extensorreflex
•Reflex berjalan
•Reflex berdiri dll.
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Flexor reflex
( crossed ) Extensor reflex
Polysynaptic reflexcontoh Withdrawal reflex
&
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Flexion Crossedextension
Berjalan Berlari
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Monosynaptic reflexContoh :
Patella reflexAchilles reflexBiceps reflexTriceps reflexRadial reflexMasseter reflex
Stretch reflex = reflex regang
Contoh :
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Medulla spinalis Saraf sensoris
Saraf motorik
Muscle spindle
Muscle fiber
Alur busur Stretch reflex
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Patella Reflex
•Rec : muscle spindles
•Sensoris : Ia / II
•Pusat : motorneuron medull spinalis
•Motorik : A
•Effektor : Muscle fiber
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Saraf motorik A
Muscle spindle
Saraf sensoris Ia / II
Saraf motorik A
Muscle fiber
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Saraf motorik A menginervasi :
Muscle fiberSaraf motorik A
menginervasi :
Muscle spindle
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Didalam suatu otot /muscle / musculus terdapat :
Muscle fibers
Diantara muscle fibers terdapat
Muscle spindles
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Muscle fiberFungsi : Kontraksi
Muscle spindleFungsi : Receptor
Terangsang oleh
tones / regangan, panjang pendek Otot
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Apakah mungkin Stretch reflex + pada penderita paralise
?
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Jawabnya :
ya
Paralise padakerusakan sistem pyramidalcontohnya penderita stroke
tidak
Poliomyelitis
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Mengapa demikian ???
Pekerjaan rumah
anda
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PUPILLARY LIGHT REFLEX
• REFLEK PUPIL TERHADAP CAHAYA
• PUSAT INTEGRASI MIDBRAIN
• MIOSIS : PUPIL MENGECIL (CAHAYA TERANG – SIMPATIS
• MIDIRIASIS : PUPIL MELEBAR : GELAP – PARASIMPATIS
• PERDARAHAN PADA MIDBRAIN / BATANG OTAK REFLEX (-)
POLYSYNAPTIC REFLEX
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GRASP REFLEX :• REFLEX MEMEGANG• PUSAT INTEGRASI : MIDBRAIN• MULAI TAMPAK PADA BAYI 5-6
BULANTONIC NECK REFLEX• REFLEX MENEGAKKAN KEPALA &
LEHER• REFLEX TONES OTOT-2 LEHER,• PUSAT INTEGRASI : NUCLEI MOTORIC
MEDULLA OBLONGATA & TECTUM
POLYSYNAPTIC REFLEX
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REFLEX YANG TERJADI AKIBAT RANGSANGAN VESTIBULAR YANG BERLEBIHAN :
NYSTAGMUS• GERAKAN BOLA MATA YANG FREKUEN
(SECARA REFLEKTORIS) DAN TIDAK DAPAT DIKENDALIKAN OLEH KEMAUAN (involuntary movement of the eye balls)
• AKIBAT VOR (vestibulo-ocular reflex) yang berlebihan NISTAGMUS
POLYSYNAPTIC REFLEX
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• IMPULS AFFERENT YANG BERASAL DARI 3 RESEPTOR VESTIBULAR GANGLION OF SCARPA N.C0HCHLEARIS CEREBELLUM
• Nn.VESTIBULARIS DI BRAIN STEM• SUPERIOR & LATERAL CEREBELLUM• LATERAL, MEDIALIS, SPINAL EFFEREN
MEDULLA SPINALIS (TRAC. VESTIBULOSPINALIS)
• SUPERIOR & MEDIAL EFERENT FLM (fasciculus longitudinalis medialis) Nn. MOTORIK UNTUK GERAKAN BOLA MATA DI BRAIN STEM (Nn. n.III, n.IV DAN n. VI) (gerakan bola mata ipsilateral dan kontralateral)
• = REFLEX VESTIBULO-OKULAR (VOR)
THALAMUS
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MOTION SICKNESS
• PENINGKTAN KEPEKAAN VESTIBULAR APP. / RANGSANGAN YG BERLEBIHAN OLEH KARENA PERJALANAN DARAT, LAUT, UDARA.
• INDIVIDU YANG HIPERSENSITIF
• Gx : VERTIGO, NAUSEA – VOMITUS, KERINGAT DINGIN, PUCAT – CEMAS –TAKUT.
POLYSYNAPTIC REFLEX