Chapter 7 Nervous/tissue
Chapter 7 Nervous tissue
1. General description: c Components ● nerve ce: neuron Glial cell: neuroglial Function: e Neurons: receive the stimulation, conduct the nerve impulse e Glial cell: support, protect and insulate nourish neurons
1. General description: ---Components: nerve cell: neuron Glial cell: neuroglial ---Function: Neurons : receive the stimulation, conduct the nerve impulse Glial cell: support, protect and insulate, nourish neurons
Neuron The structural and functional cellular unit
2. Neuron The structural and functional cellular unit
小脑满肯时细胞 卜脑粒细胞 什前角多极神经元 1)shape of neuron 神经节假单神经元 神经元的几种主要形态类型 consists of cell body, dendrite and axon -cell body: spherical, pyramidal fusiform or stellate in shape 5um -150um ---dendrite: like branches of tree axon: long thin cord-Iliked
1) shape of neuron: consists of cell body, dendrite and axon ---cell body: spherical, pyramidal fusiform or stellate in shape, 5um-150um ---dendrite: like branches of tree ---axon: long thin cord-liked
Terminal branches of axon (form junctions with other cells Dendrites (receive messages from other cells Axon (passes messages away from the cell body to Cell body other neurons (the cells life muscles, or glands) support center) Myelin sheath (covers the axon of some neurons and helps speed Neural impulse neural impulses) (electrical signal traveling down the axon)
2) structure of neuron ① cell body: cell membrane unit membrane-irritability, receive stimuli initiate and conduct nerve impulse e membrane proteins-ions channel and receptor --cell nucleus: large and round, centrally- located, less heterochromatin, so pale stained, with a large, clear nucleolus
2) structure of neuron ① cell body: ---cell membrane: unit membrane-irritability, receive stimuli, initiate and conduct nerve impulse membrane proteins-ions channel and receptor ---cell nucleus: large and round, centrallylocated, less heterochromatin, so pale stained, with a large, clear nucleolus
cytoplasm: perikaryon a. Nissl body LM: basophilic spot-liked or granule- liked structure EM: parallelly-arranged RER and free ribosome function: synthesis of proteins ● structural protein e enzymes related to the production of neurotransmitters
---cytoplasm: perikaryon a. Nissl body: LM: basophilic spot-liked or granule-liked structure EM: parallelly-arranged RER and free ribosome function: synthesis of proteins structural protein enzymes related to the production of neurotransmitters
b, Neurofibril LM:in、 silver mpregnation methods(silver preparation) there are many thread-liked dark brown structure to form a network
b. Neurofibril: LM: in silver impregnation methods(silver preparation), there are many thread-liked dark brown color structure to form a network
EM: e neurofilament 10 nm in diameter e microtubule: 25 nm in diameter function supporting g involving in intracellular transportation
EM: neurofilament: 10 nm in diameter microtubule: 25 nm in diameter function: supporting involving in intracellular transportation
C. other organelle Golgi apparatus e mitochondria e pigment
c. other organelle Golgi apparatus mitochondria pigment