Lecture 12 Nervous System (introduce CNS) 11

Lecture 12 Nervous System (introduce CNS) 11 -...

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Anatomy of the Nervous System I Angela Black, DVM, PhD Department of Animal and Avian Sciences University of Maryland, College Park
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Communication within the Body There are two “communication” systems within the body: Nervous system : utilizes electrical impulses Endocrine system : utilizes chemical messengers These two systems communicate with one another via the  Hypothalamic-Pituitary-Axis
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The Basic Functions of the Nervous System  Gather information about the external and internal environments of  the body using specialized cells (sensory cells) Initiate or regulate the contraction of skeletal, cardiac, and smooth  muscles
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The Basic Functions of the Nervous System Regulate secretions from glands  Maintain an appropriate state of consciousness  Stimulate thirst, hunger, fear, rage, and sexual       behaviors  appropriate for survival
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      The  Nervous System   C e ntra l Ne rvo us  S ys te m Brain  Spinal cord Peripheral Nervous System Peripheral nerves Connect the various parts of the body  to either the brain or spinal cord.  Spinal Nerves, Cranial Nerves The primary functional cell of the nervous system is the neuron .  
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Microscopic Neuroanatomy The individual nerve cell (neuron) consists of:   soma  (cell body)  nerve processes  dendrites  ~ transmit electrical signals toward  the cell body  axons  ~ conduct electrical signals away  from the cell body 
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The  Nervous System The  tra ns m is s io n o f info rm a tio n within the  ne rvo us   s ys te m  is  po s s ib le  b e c a us e  ne uro ns  ha ve  the   pro pe rty o f  excitability , which permits them to develop  action  potentials (changes in the electrical state of the nerve cell  membrane)  and rapidly propagate them along their individual  cellular processes  ( axons ).  
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 Nuclei   ~ groups of nerve cell bodies within the CNS   Ganglia   ~ groups of nerve cell bodies in the PNS
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Lecture 12 Nervous System (introduce CNS) 11 -...

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