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Chapter 10: Problem 4

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus microscopic branching fiber of a nerve cell that is the first part to receive the nervous impulse ___________.

Short Answer

Expert verified
The correct match is 'dendrite'.

Step by step solution

01

Understand the Question

The task is to match neurologic structures to the descriptions provided. Specifically, the description states we need to identify the part of a nerve cell that first receives nervous impulses.
02

Analyze the Description

The description mentions a 'microscopic branching fiber' and 'the first part to receive the nervous impulse'. This implies a component of a neuron involved in initial signal reception.
03

List All Options

Considering the provided options, evaluate each: - astrocyte: a type of glial cell in the brain. - axon: part of a neuron, typically transmitting impulses away from the cell body. - cauda equina: collection of spinal nerves. - cerebral cortex: outer part of the brain. - dendrite: a branching part of a neuron. - meninges: protective membranes around the brain and spinal cord. - myelin sheath: insulating layer around nerves. - neuron: a nerve cell. - oligodendroglial cell: a cell that produces myelin. - plexus: a network of nerves or vessels.
04

Match Description to Structure

The description 'microscopic branching fiber of a nerve cell that is the first part to receive the nervous impulse' best matches the 'dendrite'. Dendrites are known for their branching structures that receive signals at the start of the nerve impulse transmission process.
05

Confirm Understanding

Review the options and confirm dendrites' role as the initial receivers of nerve signals matches the description given. None of the other structures listed are primarily defined by the ability to receive nervous impulses in the described manner.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Neuron
A neuron is the fundamental unit of the nervous system, responsible for processing and transmitting information throughout the body. Neurons are unique cells characterized by their ability to communicate with other cells through electrical and chemical signals. This communication is essential for your body to perform all its functions.
Neurons consist of several key components:
  • Cell body (soma): Contains the neuron's nucleus and is the metabolic center.
  • Dendrites: Branch-like structures that receive signals from other neurons.
  • Axon: A long projection that transmits signals away from the neuron's cell body.
Understanding the basic structure and function of neurons is crucial because they form the networks that underlie everything from simple reflexes to complex thinking and emotions.
Dendrite
Dendrites are essential parts of a neuron, acting as receivers of information. Consider them like antennas that catch signals from other neurons. These signals are then transmitted to the rest of the neuron, initiating the process of communication.
Dendrites are characterized by:
  • Branching Structure: They have a tree-like appearance which increases the surface area for receiving connections, called synapses, from other neurons.
  • Role in Signal Reception: The primary function of dendrites is to gather electrical messages from these synapses.
The capacity to receive a multitude of signals makes dendrites key players in the nervous system. This is crucial for interpreting and responding to the environment.
Nervous Impulse
A nervous impulse, or action potential, is the stunning process by which neurons transmit information over long distances. Imagine it as an electrical wave that travels along the neuron's axon to convey a message.
Key characteristics of a nervous impulse include:
  • Initiation: Starts when dendrites receive a signal strong enough to exceed a threshold, triggering a response.
  • Propagation: The impulse travels rapidly along the axon due to changes in electrical charge across the neuron's membrane.
  • Transmission: At the axon terminal, the impulse prompts the release of neurotransmitters, which carry the message to the next neuron.
This rapid signaling allows the brain to coordinate complex functions such as movement, sensation, and thought almost instantaneously.
Nerve Cell Anatomy
Understanding the anatomy of a nerve cell, or neuron, is crucial to grasp how the nervous system functions. Each component of a neuron plays a specific role in transmitting signals.
The primary elements include:
  • Cell Body (Soma): Contains the nucleus and is essential for the neuron's health and function. It processes incoming signals and maintains the neuron's life.
  • Dendrites: Branching extensions that receive signals from other neurons and are the first to react when a neuron is stimulated.
  • Axon: A long, singular fiber that conveys electrical impulses away from the cell body to other neurons, muscles, or glands.
  • Myelin Sheath: A fatty covering that insulates the axon and speeds up signal transmission.
This anatomical understanding equips you with a fundamental appreciation for how nerve cells facilitate communication in the body, driving everything from simple tasks to complex cognitive processes.

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Most popular questions from this chapter

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus glial cell that produces myelin _______.

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus fatty tissue that surrounds the axon of a nerve cell _______.

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus glial cell that transports water and salts between capillaries and nerve cells _______.

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus collection of spinal nerves below the end of the spinal cord at the level of the second lumbar vertebra _______.

Match the listed neurologic structures with the descriptions/definitions that follow. astrocyte axon cauda equina cerebral cortex dendrite meninges myelin sheath neuron oligodendroglial cell plexus large, interlacing network of nerves ___________.
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