Chapter 3.1 Organization of the Nervous System Notes Flashcards Preview

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1

The nervous system is organized into the _________ consisting of the brain and spinal cord and the __________ consisting of nerve fibres that carry information between the CNS and other parts of the body

The nervous system is organized into the Central Nervous System (CNS) consisting of the brain and spinal cord and the Peripheral Nervous System (PNS) consisting of nerve fibres that carry information between the CNS and other parts of the body

2

The PNS is subdivided into ______ and ______ divisions 

The PNS is subdivided into Afferent and Efferent divisions 

3

The afferent division carries information ______ the CNS

The afferent division carries information to the CNS (afferent - A - Arrival)

4

The efferent division carries information ____ the CNS to ________

The efferent division carries information away from the CNS to effector organs

(Efferent - E - Exit)

5

What are Effector Organs?

Muscles or glands that carry out instructions to bring about the desired effect

6

The efferent nervous system is further divided into the ________ and ________ nervous systems

The efferent nervous system is further divided into the somatic and autonomic nervous systems

7

What does the somatic nervous system consists of? 

 

 

The nerve fibres of the motor neurons that supply the skeletal muscles

8

What does the Autonomic Nervous system consist of? 

Nerve fibres that innervate smooth musclecardiac muscle, and glands

9

The Autonomic Nervous system is further subdivided into the _________ and _________ nervous systems

The Autonomic Nervous system is further subdivided into the sympathetic and parasympathetic nervous systems

10

The sypathetic and parasympathetic nervous systems both innervate most of the ____ supplied by the autonomic system

The sypathetic and parasympathetic nervous systems both innervate most of the organs supplied by the autonomic system

11

What are the three functional classes of neurons?

  1. Afferent Neurons
  2. Efferent Neurons
  3. Interneurons

12

The afferent division of the peripheral nervous system consists of ______ neurons

The afferent division of the peripheral nervous system consists of afferent neurons

13

At its peripheral ending, a typical afferent neuron has a _____ ______ that generates action potentials in response to a particular type of stimulus (eg touch)

At its peripheral ending, a typical afferent neuron has a sensory receptor that generates action potentials in response to a particular type of stimulus (eg touch)

14

Which funtional type of neuron has a cell body that is devoid of dendrites and presynaptic inputs?

Afferent Neuron

15

Along with Afferent neurons, _____ neurons also lie primarily within the peripheral nervous system

Along with Afferent neurons, Efferent neurons also lie primarily within the peripheral nervous system

16

Efferent neuron cell bodies originate in the _____ where many centrally located presynaptic inputs converge on them to influence their outputs to the ______ organs

Efferent neuron cell bodies originate in the CNS where many centrally located presynaptic inputs converge on them to influence their outputs to the effector organs

17

_______ travel out of the CNS to meet the muscles or glands they innervate

Efferent Axons (aka efferent fibres) travel out of the CNS to meet the muscles or glands they innervate

18

_______ lie entirely within the CNS and include about __% of neurons

Interneurons lie entirely within the CNS and include about 99% of neurons

19

Interneurons serve two main roles:

  1. Connect afferent and efferent neurons; allow integration of peripheral responses to peripheral information
  2. interconnections between interneurons are responsible for abstract phenomena associated with the mind (thoughts, emotions, memory, creativity, intellect and motivation)