Qhov Tseem Ceeb Qhov txawv - Preganglionic vs Postganglionic Neurons
Lub paj hlwb yog ib qho tseem ceeb ntawm cov kab mob hauv lub cev. Nws muaj ntau yam haujlwm xws li kev sib koom tes ntawm lub cev ua haujlwm thiab teb rau stimuli. Neurons yog cov qauv tsim thiab kev ua haujlwm ntawm lub paj hlwb. Ntau hom neurons muaj nyob rau hauv lub paj hlwb. Preganglionic thiab postganglionic neurons yog cov piv txwv ntawm ntau hom neuron. Lawv txawv ntawm ob qho tib si physiology thiab kev ua haujlwm. Preganglionic neurons yog ib txheej ntawm cov hlab ntsha ntawm lub paj hlwb uas txuas lub hauv nruab nrab paj hlwb mus rau ganglia. Postganglionic neurons yog ib txheej ntawm cov paj hlwb uas muaj nyob rau hauv lub paj hlwb autonomic txuas cov ganglia mus rau lub cev muaj zog. Qhov no yog qhov sib txawv tseem ceeb ntawm preganglionic thiab postganglionic neurons.
Dab tsi yog Preganglionic Neurons?
Preganglionic neurons yog ib pawg ntawm cov paj hlwb ntawm lub paj hlwb autonomic uas txuas lub hauv paus paj hlwb (lub hlwb thiab qaum qaum) mus rau ganglia. Tag nrho cov preganglionic fibers ntawm lub autonomous paj hlwb tau hais tias yog cholinergic, txhais tau hais tias cov paj hlwb siv acetylcholine ua lawv cov neurotransmitter thaum lub teeb liab kis tau tus mob. Cov cuab yeej cholinergic ntawm cov paj hlwb no muaj rau ob qho tib si sympathetic paj hlwb thiab parasympathetic paj hlwb ntawm lub paj hlwb autonomic. Tag nrho cov neurons no yog myelinated rau kev sib kis tau zoo ntawm cov hlab ntsha impulses.
Muaj qhov sib txawv me me ntawm cov preganglionic neurons ntawm lub paj hlwb sympathetic thiab parasympathetic paj hlwb. Lub preganglionic neurons ntawm lub paj hlwb sympathetic yog luv dua li preganglionic neurons ntawm parasympathetic paj hlwb. Qhov sib txawv no yog vim lub fact tias, preganglionic neurons ntawm lub sympathetic paj hlwb nyob ze rau tus txha caj qaum dua lub preganglionic neurons ntawm lub paj hlwb parasympathetic. Lub paj hlwb parasympathetic yog nyob ze rau ntawm cov khoom nruab nrog cev.
Daim duab 01: Preganglionic Neurons
Nyob rau hauv cov ntsiab lus ntawm tus txha caj qaum tawm cov ntsiab lus, preganglionic neurons ntawm sympathetic thiab parasympathetic paj hlwb txawv. Lub sympathetic paj hlwb muaj ib tug thoracolumbar outflow, uas txhais tau hais tias lub preganglionic neurons pib ntawm cov ntsiab lus ntawm T1 mus rau L2 ntawm thoracic thiab lumbar feem ntawm tus txha caj qaum feem. Lub paj hlwb parasympathetic muaj ib qho kev tawm ntawm craniosacral, uas txhais tau hais tias lub paj hlwb preganglionic pib ntawm cov hlab ntsha cranial CN2, CN7, CN9, CN10 thiab sacral qab haus huv S2, S3 thiab S4 ntawm tus txha caj qaum..
Postganglionic Neurons yog dab tsi?
Nyob rau hauv cov ntsiab lus ntawm postganglionic neurons, lawv yog cov txheej txheem ntawm paj hlwb uas muaj nyob rau hauv lub autonomic paj hlwb uas txuas cov ganglia mus rau lub cev effector. Kev sib cuam tshuam ntawm postganglionic neurons nrog lub cev muaj zog ua lub luag haujlwm los tsim cov kev hloov pauv hauv lub cev los ntawm kev tswj hwm biochemical. Cov postganglionic neurons ntawm ob leeg sympathetic thiab parasympathetic paj hlwb muaj ob peb qhov sib txawv. Lub postganglionic neurons ntawm sympathetic system yog androgenic. Qhov no txhais tau tias cov neurons siv adrenaline, noradrenaline ua cov neurotransmitters.
Cov postganglionic neurons ntawm parasympathetic yog cholinergic zoo ib yam li preganglionic neurons. Yog li no cov neurons siv acetylcholine ua cov neurotransmitter. Ntawm cov synapses uas tam sim no nyob rau hauv lub ganglia, preganglionic paj fibers tso acetylcholine uas koom nrog cov activation ntawm nicotinic acetylcholine receptors tam sim no nyob rau hauv lub postganglionic neurons. Raws li cov lus teb rau qhov kev txhawb nqa tshwj xeeb no, postganglionic neurons tso tawm norepinephrine uas ua rau muaj kev ua haujlwm ntawm adrenergic receptors tam sim no nyob rau hauv cov ntaub so ntswg peripheral ntawm lub hom phiaj lub cev.
Daim duab 02: Postganglionic Neurons
Muaj ob qhov kev zam hauv cov ntsiab lus ntawm kev teb rau acetylcholine nyhuv los ntawm postganglionic neurons. Lawv suav nrog chromaffin hlwb ntawm adrenal medulla thiab postganglionic neurons ntawm hws qog uas lawv zais acetylcholine los qhib muscarinic receptors. Cov chromaffin hlwb ntawm adrenal medulla ua haujlwm li postganglionic neurons. Kev loj hlob ntawm adrenal medulla tshwm sim nyob rau hauv lub sympathetic paj hlwb. Thaum kawg, nws ua haujlwm raws li kev hloov kho kev sib raug zoo ganglion.
Dab tsi yog qhov zoo sib xws ntawm Preganglionic thiab Postganglionic Neurons?
• Ob leeg preganglionic thiab postganglionic neurons yog hom neurons lossis paj hlwb muaj nyob rau hauv lub paj hlwb.
• Ob leeg preganglionic thiab postganglionic neurons koom nrog cov lus teb rau ib qho kev txhawb nqa.
• Ob leeg preganglionic thiab postganglionic neurons muaj nyob rau hauv lub paj hlwb sympathetic thiab parasympathetic.
Qhov txawv ntawm Preganglionic thiab Postganglionic Neurons yog dab tsi?
Preganglionic vs Postganglionic Neuron |
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| Preganglionic neurons yog ib txheej ntawm cov hlab ntsha ntawm lub paj hlwb uas txuas lub hauv nruab nrab lub paj hlwb mus rau ganglia. | Postganglionic neurons yog cov paj hlwb uas muaj nyob rau hauv lub paj hlwb uas txuas cov ganglion mus rau lub cev effector. |
| Kev sib txuas nrog Central Nervous System | |
| Preganglionic neurons txuas nrog lub hauv nruab nrab lub paj hlwb. | Postganglionic neurons tsis txuas ncaj qha rau hauv nruab nrab lub paj hlwb. |
| Kev sib txuas nrog Cov Khoom Siv Hluav Taws Xob | |
| Preganglionic neurons tsis txuas nrog cov khoom nruab nrog cev. | Postganglionic neurons txuas nrog cov khoom nruab nrog cev. |
Summary – Preganglionic vs Postganglionic Neurons
Preganglionic neurons yog cov txheej txheem ntawm cov paj hlwb ntawm lub paj hlwb autonomic uas txuas lub hauv nruab nrab paj hlwb mus rau ganglia. Tag nrho cov preganglionic fibers uas muaj nyob rau hauv lub autonomous paj hlwb yog cholinergic. Postganglionic neurons yog cov paj hlwb uas muaj nyob rau hauv lub paj hlwb uas txuas cov ganglia mus rau lub cev muaj zog. Kev sib cuam tshuam ntawm cov postganglionic neurons nrog lub cev effector yog lub luag haujlwm los tsim kev hloov pauv hauv lub cev effector. Lub postganglionic neurons ntawm lub sympathetic system yog androgenic. Cov postganglionic neurons ntawm parasympathetic yog cholinergic. Qhov no yog qhov txawv ntawm preganglionic thiab postganglionic neurons.
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Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov rub tawm PDF version ntawm no: Qhov txawv ntawm Preganglionic thiab Postganglionic Neurons
