Nerve Notes NEURON n Nerve tissue are made

  • Slides: 15
Download presentation
Nerve Notes

Nerve Notes

NEURON n Nerve tissue are made of neuron (nerve cell) and neuroglia n Neuron

NEURON n Nerve tissue are made of neuron (nerve cell) and neuroglia n Neuron are made of: n Cell body – contains nucleus and other organelles n Dendrites – receiving portions, short, tapered and highly branched

n Axon – conducts nerve impulses to another neuron or to an effector organ

n Axon – conducts nerve impulses to another neuron or to an effector organ (muscle or gland) n Axon arises from the axon hillock n Axons start as a single fiber, but may give off branches called axon collaterals

n Axon and collaterals end in axon terminals which end in synaptic end bulbs

n Axon and collaterals end in axon terminals which end in synaptic end bulbs § end bulbs contain synaptic vesicles that contain neurotransmitters (chemical messengers)

MYELIN n Most axons are surrounded by a myelin sheath n Myelin acts as

MYELIN n Most axons are surrounded by a myelin sheath n Myelin acts as an insulator n increases the speed at which the impulse travels n Gaps between myelin sheath are called the nodes of Ranvier

CLASSIFICATION OF NEURON n Multipolar – several dendrites and one axon – neurons of

CLASSIFICATION OF NEURON n Multipolar – several dendrites and one axon – neurons of CNS are mostly this type n Bipolar – one main dendrite and one axon – usually found in special sense organs

n Unipolar - just one process, and are always sensory neurons. Axon terminals are

n Unipolar - just one process, and are always sensory neurons. Axon terminals are in CNS and cell bodies in ganglia outside CNS

FUNCTIONAL CLASSIFICATION n Sensory or afferent neurons – transmit sensory impulses (toward CNS), have

FUNCTIONAL CLASSIFICATION n Sensory or afferent neurons – transmit sensory impulses (toward CNS), have specialized receptor ends at tips of dendrites or the dendrites are in contact with specialized receptor cells in skin or sense organs n Most are unipolar, some are bipolar

n Motor or efferent neurons – transmit motor nerve impulses from CNS to effectors

n Motor or efferent neurons – transmit motor nerve impulses from CNS to effectors n Interneurons – multipolar neurons in CNS. that form links between other neurons

Neuron Neuron Neuron Mitocondrie Membrana Nucleu RE rugosNeuron Neuron Neuron Mitocondrie Membrana Nucleu RE rugos
Neuron Talk What one neuron tells another neuronNeuron Talk What one neuron tells another neuron
ANA 211 NERVE TISSUE INTRODUCTION Nerve tissue isANA 211 NERVE TISSUE INTRODUCTION Nerve tissue is
Starting small The Neuron neuron a nerve cellStarting small The Neuron neuron a nerve cell
Starting small The Neuron neuron a nerve cellStarting small The Neuron neuron a nerve cell
Nerve Excitation Biophysics Neurons Motor neuron Sensory neuronNerve Excitation Biophysics Neurons Motor neuron Sensory neuron
Neuron Anatomy Neurons u Neuron is a nerveNeuron Anatomy Neurons u Neuron is a nerve
Brain Body and Behavior The Neuron Neuron nerveBrain Body and Behavior The Neuron Neuron nerve
Epithelial tissue Connective tissue Muscular tissue Nervous tissueEpithelial tissue Connective tissue Muscular tissue Nervous tissue
Connective tissue Muscle tissue Nervous tissue Epithelial tissueConnective tissue Muscle tissue Nervous tissue Epithelial tissue
Nerve Impulses Neuron Physiology Action Potentials nerve impulsesNerve Impulses Neuron Physiology Action Potentials nerve impulses
Nerve Impulses Neuron Physiology Action Potentials nerve impulsesNerve Impulses Neuron Physiology Action Potentials nerve impulses
Tissue Notes Types of Tissue 1 Epithelial TissueTissue Notes Types of Tissue 1 Epithelial Tissue
Chapter 14 Nervous Tissue Neuron single cell NerveChapter 14 Nervous Tissue Neuron single cell Nerve