pbl blok 6 neuro
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PBL BLOK 6Lumpuh Lengan Bawah
Novia Margaretha Rebeca H102010103
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Medula Spinalis dan Sistem Saraf Perifer
Medulla spinalis
1. Terletak sepanjang canalis vertebralis sampai pada
segmen L2
2. Berbentuk silinder berongga dan agak pipih
3. Terdapat dua pembesaran, cervical dan lumbal
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4. 31 pasang saraf spinal
5. Dilindungi tulang vertebra, meninges, dan LCS
6. Cornus medularis
7. Posisi dipertahankan oleh ligamentum
denticulatum
8. Bagian interna terdiri dari substansia alba dan
grisea
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Fungsi medulla spinalis
Mengendalikan berbagai aktivitas reflex dalam tubuh
Transmisi impuls (asenden dan desenden)
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Plexus brachialisTerbentuk dari nervi spinales C5-8 dan T1. Cabang-cabang
dari plexus brachialis, adalah sebagai berikut:
RadixNervus dorsalis scapulae (C5)Nervus thoracalis longus (C5, 6,
dan 7)
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Truncus superiorNervus subclavius (C5 dan 6)
Nervus suprascapularis (menyarafi
musculus supraspinatus dan infaspinatus)
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Fasciculus lateralis
Nervus pectoralis lateralis
Nervus musculocutaneus
Radix lateralis nervi mediani
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Fasciculus medialis
Nervus pectoralis medialis
Nervus cutaneus brachii medialis dan
nervus cutaneus antebrachii medialis
Nervus ulnaris
Radix medialis nervi mediani
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Fasciculus posterior
Nervus subcapularis superior dan inferior
Nervus thoracodorsalis
Nervus axillaris
Nervus radialis
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Susunan mikroskopis saraf tepiSarafGangliaUjung saraf
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Mekanisme jalannya impuls dan kontraksi
Reseptor menerima rangsang
Terjadi depolarisasi pada serabut saraf
Ujung presinaps dan postsinaps
Impuls diteruskan sepanjang saraf
Impuls mencapai neuromuskular junction
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Vesikel mengeluarkan neurotransm,itter
Potensial aksi mencapai serabut otot
Kalsium keluar dari retikulum sarkoplasma
Kontraksi otot
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Transmitter dalam penjalaran impuls
Transmitter molekul kecil
Transmitter molekul besar
(neuropeptida)
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Transmitter molekul kecil
Asetilkolin
Norepinefrin
Dopamin
Glisin
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Gaba
Glutamat
Serotonin
Nitrat oksida