Structural Classification of Neurons Flashcards

Questions and Answers

Which of the following are classifications of neurons?

Sensory

Anaxonic (correct)

Multipolar (correct)

Bipolar (correct)

What are Anaxonic neurons?

Small and have no anatomical features that distinguish dendrites from axons; found in brain and sense organs.

What characterizes Bipolar neurons?

Two distinct processes: one dendrite process that branches extensively at its distal tip and one axon with the cell body between the two.

Describe Unipolar neurons.

Dendrites and axons are continuous, and the cell body lies off to one side; found in sensory neurons in the PNS. Signup and view all the answers

What are the defining features of Multipolar neurons?

Two or more dendrites and a single axon; found in motor neurons that control skeletal muscle. Signup and view all the answers

What role do Sensory neurons play?

Form afferent divisions of PNS, delivering information from sensory receptors to the CNS. Signup and view all the answers

What is the function of Somatic sensory neurons?

Monitor the outside world and our position within it. Signup and view all the answers

What do Visceral sensory neurons monitor?

Internal conditions and the status of other organ systems. Signup and view all the answers

What is the function of Motor neurons?

Form efferent divisions of PNS, carrying instructions from the CNS to peripheral effectors in tissues and organs. Signup and view all the answers

Describe Interneurons.

Mostly located in the brain and spinal cord; responsible for the distribution of sensory information and coordination of motor activity. Signup and view all the answers

What are Neurogila?

Cells that support and protect neurons. Signup and view all the answers

Anaxonic neurons are a type of functional neuron.

False Signup and view all the answers

Match the following types of neurons to their categories:

Anaxonic = Structural neuron Sensory = Functional neuron Motor = Functional neuron Interneuron = Functional neuron Signup and view all the answers

Study Notes

Structural Classification of Neurons

Neurons are classified into four main types: Anaxonic, Bipolar, Unipolar, and Multipolar.

Anaxonic Neurons

Small neurons lacking distinct dendrites and axons.
Primarily located in the brain and sensory organs.

Bipolar Neurons

Characterized by two distinct processes: one extensive dendrite and one axon, with the cell body situated between them.
Commonly found in sensory organs.

Unipolar Neurons

Feature a single continuation of the process where dendrites and axon are connected; the cell body is offset to one side.
Typically associated with sensory neurons in the peripheral nervous system (PNS).

Multipolar Neurons

Have multiple dendrites and a single axon.
Predominantly found in motor neurons that control skeletal muscles.

Sensory Neurons

Make up the afferent division of the PNS, transmitting information from sensory receptors to the central nervous system (CNS).

Somatic Sensory Neurons

Specialized to monitor external environments and the body’s positions in space.

Visceral Sensory Neurons

Focused on monitoring internal conditions and the status of various organ systems.

Motor Neurons

Form the efferent division of the PNS, carrying commands from the CNS to peripheral effectors in tissues and organs.

Interneurons

Mainly located in the brain and spinal cord.
Play a crucial role in processing sensory information and coordinating motor activities.

Neuroglia

Supportive cells that protect and assist neurons in the nervous system.

Structural vs Functional Neurons

Structural classifications include Anaxonic, Bipolar, Unipolar, and Multipolar.
Functional classifications encompass Sensory, Motor, and Interneurons.

Description

This quiz covers the structural classification of neurons, detailing the characteristics of Anaxonic, Bipolar, Unipolar, and Multipolar neurons. Test your knowledge on their definitions and unique features. Ideal for students studying neuroscience or related fields.