SSP Divisi Aferen
Transcript of SSP Divisi Aferen
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CENTRAL NERVOUS SYSTEMDIVISI AFEREN
dr. mona amelia, mbiomed
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Definisi
• Sistem penerimaan impuls melalui – Reseptor– Akson– Ganglion sensorik– Cornu posterior– Tractus spinothalamicus– Corona radiata - Cortex cerebri, gyrus
post centralis– Persepsi
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KASUS KHUSUS
• Beberapa organ sensorik diferensiasi tingkat tinggi
• ORGANON SENSES• Reseptor khusus (retina, utriculus,
sacculus, vibrissae, tastebud, dst)• Ganglion nucleus khusus intra
cranial
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Inervasi Sensorik Perifer
• Reseptor• Akson (serabut saraf perifer)• Ganglion sensorik• Neuron ordo 1
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Inervasi Sensorik Sentral
• Cornu posterior medulla spinalis (substansia grisea)
• Tractus spinothalamicus (substansia alba)
• Neuron ordo 2
• Thalamus• Corona radiata (substansia alba)• Cortex cerebri (substansia grisea)• Neuron ordo 3
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JARAS SENSORIKINFORMASI SENSORIK SADAR
INFORMASI SENSORIK tak SADAR
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TIGA SISTEM SENSORIK SADAR
• Lemniscus medialis – collumna dorsalis
• Tractus anterolateral
• Tractus trigeminal
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Lemniscus medialis – collumna dorsalis
• Fasciculus gracilis• Fasciculus cuneatus• diskriminasi raba, posisi sendi,
getar/ vibrasi
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• Tractus spinothalamicus anterior• Tractus spinothalamicus lateral • diferensiasi rasa raba, nyeri,
suhu
Tractus Anterolateral
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• Selain sensorik juga ada jaras motorik (tractus ascendens dan descendens sekaligus)
• Hanya untuk daerah kepala• Sensorik yang diwakilinya adalah
raba, suhu, dan nyeri• Getar, posisi, raba kasar lemniscus
medialis
Tractus Trigeminal
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Nama jaras Informasi sensorik Terminal
Tractus spinothalamicus lateral
Nyeri dan suhu Gyrus postcentralis cortex cerebri kontralateral
Tractus spinothalamicus anterior
Raba halus dan tekanan
Fasciculus gracilis dan fasciculus cuneatus
Rasa raba diskriminatif, getar, dan sendi otot
Tractus special:Tractus dorsolateral Liessauri
nyeri Intersegmental
Tractus trigeminal Raba, suhu, nyeri daerah kepala
Gyrus postcentralis cortex cerebri kontralateral
INFORMASI SENSORIK SADAR
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• Tidak melalui thalamus• Informasi ascendens/ aferen ini menuntut
respons descendens/ eferen segera• Sebagian kecil informasi tetap masuk ke
jalur sadar lebih lama• Respon lebih cepat dari kesadaran• JANGAN LUPA– Tractus ascendens dan descendens adalah
kontinuitas!!!
TIGA SISTEM SENSORIK TIDAK SADAR
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INFORMASI SENSORIK TAK SADAR
Nama jaras Informasi sensorik Terminal
tractus spinocerebellaris posterior
Sensasi sendi, otot dan tendon
Cerebellum ipsilateraltractus spinocerebellaris anteriortractus cuneocerebellaris
tractus spinoolivarius
Tractus spinotectalis reflek spinovisual Colliculus superior dan formatio reticularis
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FORMATIO RETICULARIS
• Pusat jaga, kesadaran, dan waspada– Pusat respirasi dan kardiovaskuler MO– Pusat motorik terpadu (tractus cortico-
reticulo-spinal) pons– Sistem proyeksi ascendens (ARAS,
Ascending Reticulare Activating System) kewaspadaan
– hubungan batang otak dengan cerebellum, keseimbangan