Qhov sib txawv tseem ceeb ntawm axon thiab dendrites yog kev ua haujlwm ntawm ob hom cytoplasmic extensions ntawm neuron. Axon kis cov hlab ntsha tawm ntawm lub cev ntawm lub cev thaum dendrites hla cov hlab ntsha impulses mus rau lub cev ntawm tes.
Neurons yog peb hom loj; lub cev muaj zog neuron, sensory neuron thiab interneuron. Tag nrho cov neurons yog tsim los ntawm lub cev ntawm tes uas ua txhua yam haujlwm thiab cytoplasmic extensions uas tuaj yeem yog axons lossis dendrites. Yog li ntawd, cov dej num ntawm axon thiab dendrites tshwm sim raws li cov kev taw qhia uas cov hlab ntsha impulse kis tau.
Axons yog dab tsi?
Axon yog qhov ntev cytoplasmic txuas ntxiv tshwm sim los ntawm lub cell lub cev ntawm cov neuron. Nws kis cov hlab ntsha impulses tawm ntawm lub cev ntawm tes mus rau cov nyhuv uas nyob hauv cov leeg thiab cov qog. Txhua tus neuron muaj ib qho axon, txawm hais tias ib qho axon kuj tuaj yeem tuaj yeem txhawb nqa qee lub hlwb. Lub myelin sheath encases axons, thiab muaj Schwann hlwb nyob rau ntawm myelin sheath. Axons tuaj yeem txuas ntxiv yog myelinated lossis tsis yog myelinated. Myelination nce qhov ceev ntawm cov hlab ntsha impulse kis tau tus mob. Yog li ntawd nws ua raws li ib tug insulator rau lub paj hlwb impulse kis tau tus mob
Daim duab 01: Axon
Ntau lub myelin sheaths qhwv ib ncig ntawm ib qho axon, thiab nyob rau nruab nrab, muaj qhov sib txawv ua rau cov nodes ntawm Ranvier. Axons muaj cov neurofibrils tab sis tsis yog Nissl's granules.
Dendrites yog dab tsi?
Dendrites yog qhov luv cytoplasmic txuas ntxiv tshwm sim los ntawm lub cev ntawm tes thiab ua kom cov neurons tau txais cov paj hlwb ib txhij los ntawm cov receptors sib txawv nyob thoob plaws lub cev. Lub cev muaj zog neurons thiab interneurons feem ntau muaj cov ceg dendrites heev.
Daim duab 02: Dendrites
Qee cov neurons muaj ntau qhov txuas ntxiv tshwm sim los ntawm lawv cov dendrites hu ua dendritic spines, thiab qhov ntawd ua rau thaj tsam saum npoo muaj kom tau txais cov paj hlwb. Dendrites tsis muaj neurofibrils, tab sis Nissl's granules tam sim no.
Dab tsi yog qhov zoo sib xws ntawm Axons thiab Dendrites?
- Ob Axons thiab Dendrites yog ib feem ntawm cov neuron.
- Axons thiab Dendrites tshwm sim los ntawm lub cev ntawm tes.
- Ob leeg Axons thiab Dendrites koom nrog kev thauj cov hlab ntsha.
Qhov txawv ntawm Axons thiab Dendrites yog dab tsi?
Axons vs Dendrite |
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| Lub axon yog qhov txuas ntev ntawm cov neuron uas hla cov hlab ntsha impulses tawm ntawm lub cev ntawm tes. | Cov dendrites yog qhov txuas luv luv uas dhau cov hlab ntsha impulses mus rau lub cev ntawm tes. |
| qauv | |
| Axons yog cov txheej txheem ntev nyias ntawm cov tuab tuab thiab du. | Dendrites yog cov txheej txheem luv luv, tuab zuj zus, thiab cov ceg ntoo yog studded nrog spiny projections. |
| Number per Cell Body | |
| Ib tug neuron muaj ib axon. | Ib tug neuron muaj ntau qhov kev kwv yees ntawm dendrites. |
| Neurofibrils muaj nyob hauv axons. | Neurofibrils tsis nyob hauv dendrites. |
| Presence of Nissl's Granules | |
| Nissl's granules tsis tuaj hauv axons. | Nissl's granules muaj nyob hauv axons. |
| Ribosomes | |
| Ribosomes tsis nyob hauv axons. | Ribosomes muaj nyob hauv axons. |
| Myelin rwb thaiv tsev | |
| Myelin sheath tej zaum yuav muaj lossis tsis muaj nyob hauv axons. | Myelin sheath tsis nyob hauv dendrites. |
| Branching Points | |
| Branching cov ntsiab lus ntawm axons ceg deb ntawm lub cev ntawm tes. | Branching cov ntsiab lus ntawm dendrites ceg ze rau lub cev ntawm tes. |
Summary – Axons vs Dendrites
Axons thiab dendrites yog cov qauv tseem ceeb hauv cov neuron. Lub neuron yog lub ntsiab yam ntxwv thiab kev ua haujlwm ntawm lub paj hlwb. Cov axons koom nrog kev noj cov paj hlwb tawm ntawm lub cev ntawm tes. Cov teeb liab no raug xa mus rau cov khoom siv hluav taws xob xws li cov leeg thiab cov qog. Dendrites koom nrog hauv kev xa cov paj hlwb impulses mus rau lub cev ntawm tes. Cov paj hlwb tau txais los ntawm cov khoom siv hauv nruab nrog cev yog kis mus rau lub cev ntawm tes. Qhov no yog qhov txawv ntawm axons thiab dendrites.
Image Courtesy:
1.'Blausen 0657 MultipolarNeuron'By BruceBlaus - Tus kheej ua haujlwm, (CC BY 3.0) ntawm Commons Wikimedia
2.'Dendrite (PSF)'By Pearson Scott Foresman (Public Domain) ntawm Commons Wikimedia
