Chapter 12 Nervous Tissue

Chapter 12 Nervous Tissue - Chapter 12 Nervous Tissue Pages...

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Chapter 12 Nervous Tissue Pages 415 – 454 1. Overview Of The Nervous System Master control of the body; weighs 2 kg. Organized into networks; billions of neurons and 10x as many neuroglia. Communicates with itself or others through chemical and electrical gradient. A. Structures of the Nervous System: CNS & PNS: Fig 12.1 Brain: (CNS) Contains 100 billion neurons and 10x as many neuroglia. Enclosed by skull. Cranial Nerves: Twelve pairs that emerge from the base of the brain ( Brain Stem) Supply special senses…Hearing, Smell, Sight, Touch, others… Nerve: Bundle of 100-1000s of axons plus associated ( enclosed ) connective tissue and blood vessels . CNS; communicate to various parts of the body and vice versa. All nerves have a distinct pathway. Spinal Cord ( CNS) Connects brain to body and bones of the vertebral column protect it. Has 100 million neurons and 5x-50x of neuroglia (depending on area of spinal cord the neurons come from) Spinal Nerves: 31 pairs emerge from the spinal cord and supplies the rest of the body with nerves on the right and left side of the cord. Ganglia: Part of the PNS but located outside of CNS and works with these nerves a lot. They are small masses of nervous tissue consisting of neuron cell bodies. Sensory Receptors: Dendrites of sensory neurons , and also specialized cells that monitor changes in internal and external environments . Can be special cells or capsulated. Picks up information. o Baroreceptors: Picks up blood pressure information. Enteric plexuses: Extensive network of neurons that regulate the digestive system (GI Tract) consists of 100 million neurons. 1
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Koch Special neurons in brain that create their own network and communicate at high wavelengths. British Lady No special neurons, certain situations where certain neurons clump. Mind is separate from brain, but what parts? B. Functions of the Nervous System Sensory: Detects internal stimuli Information comes in. Integrative Function: Processes sensory information and makes decisions on the info (from the brain). The information is digested. Motor: utilizes effectors (muscles and glands) and have them stimulated to go with the function . The action from the processed information C. Subdivisions of the Nervous System: Central Nervous System (CNS): Brain and Spinal Cord. Peripheral Nervous System (PNS): All the other nervous tissue. 2
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2. Histology of Nervous Tissue Fig. 12.2 A. Neurons: Nerve Cells Electrically excitable. Takes information to and away from the CNS. Microtubules: Moves substances back and forth…ie Neurotransmitters. Neuroglia: Looks after the neuronos. Neurofibril: Gives shape of neurons and some sort of transport.
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Chapter 12 Nervous Tissue - Chapter 12 Nervous Tissue Pages...

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