Nervous tissue. Lab. 7
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1 Nervous tissue Lab. 7
2 Nervous tissue :- is responsible for transport nervous impulse (motor and sensory impulse), and it is formed by network more than 100 million nerve cell (neurons), nerve fiber and nerve ending, nerve tissue develop from ectoderm.
3 Nerve cell (neurons):- are responsible for reception transmission and processing of stimuli and release neurotransmitters and are consist of:- dendrites:- which are multiple elongated processes specialized for receiving stimuli from environment cell body:- perikaryon axon:- single process specialized in generating or conducting nerve impulse to other cells (nerve, muscle, gland)
4 Nerve cell classified to 3 types according to numbers of process Multipolar which have more than 2 processes. Most neurons of the body are multipolar Bipolar which have 2 processes. Found retina and olfactory mucosa Pseudounipolar which have single process and it divide to 2 branches. Found spinal ganglia and cranial ganglia
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9 Fiber: - consist of axons enveloped by special sheath of Schwann cell. And classified to:- Myelinated fibers: - are the fiber which enveloped with multilayer Schwann s plasmalema and unite form myelin sheath and the space between 2 Schwann cell is called node of Ranvier. Found mainly in PNS. Un myelinated fibers: - the axons are enveloped within simple cleft of Schwann cells found in CNS.
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13 Nerve ending: - the nerves end either in muscle or connective tissue or epithelial tissue. Therefore they are of two type sensory nerve ends or motor nerve ending.
14 Meissner corpuscles:- are small encapsulated sensory receptors found in the dermis of skin (finger tip, foot, eyelid, lips) Meissner corpuscles are oval shape the receptors consist of delicate collagenous tissue capsule surrounding a mass of plump, oval cells arranged transversely and representing specialized Schwann cells and non myleinated sensory fiber rarify throughout the cell mass in helical meaner.
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17 Pacinian corpuscles: - large encapsulated sensory receptor responsive to pressure or coarse touch, vibration and tension found in deep skin layer, ligament. These organs consist of delicate capsule enclosing many concentric lamellae of flattened cell
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19 Motor nerve end: - in which nerve fiber end in striated muscles and becomes unmyelinated and branch and end with dents.
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21 Neuromuscular spindle: - stretch receptor organs within skeletal muscles which are responsible for regulation of muscle tone via spinal reflex. These organs are encapsulated, lymph filled fusiform structure. Each spindle contain 2 to 10 modified skeletal muscle fibers called (intra fusel fibers) which are smaller than skeletal proper membrane. The intra fusal fibers have a central non striated area and nuclei tend to central.
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23 Spinal ganglion: - are aggregations of neurons cell bodies located outside CNS and spinal ganglia lie on the posterior nerve roots of spinal cord. They contain the cell bodies of primary sensory neurons which are psendounipolar and they surrounded by satellite cell (provide structural and metabolic support ) and there is fascicle of nerve passing to the center of ganglion and whole ganglion is encapsulated by condensed supporting tissue which continuous with perineural and epineuria sheaths of the peripheral nerve.
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28 Nerve trunk: - nerve fibers grouped in bundles to form the nerves. Nerves have an external fibrous coat of dense connective tissue called epineurium.which also fills the space between the bundles of nerve fibers which called perineurium. The endoneurium consist of a thin layer of reticular fibers produced by Schwann cells. The layers protect the nerve from aggression and act as barrier to the passage of macromolecules.
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32 Thank you for Listening
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