Nervous Tissue Overview

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What is the primary function of astrocytes in the central nervous system?

  • Myelination of axons
  • Secretion of cerebrospinal fluid
  • Formation of the blood-brain barrier (correct)
  • Phagocytosis of damaged cells

Which type of neuroglia is responsible for the myelination of nerve fibers in the peripheral nervous system?

  • Ependymal cells
  • Oligodendrocytes
  • Microglia
  • Schwann cells (correct)

How do microglia function in the nervous system?

  • Scanning for damaged cells and microorganisms (correct)
  • Regenerating damaged neurons
  • Secreting cerebrospinal fluid
  • Providing structural support to neurons

What characterizes protoplasmic astrocytes compared to fibrous astrocytes?

<p>They have many short and branching processes (B)</p> Signup and view all the answers

What type of cells line the central canal of the spinal cord and brain ventricles?

<p>Ependymal cells (B)</p> Signup and view all the answers

Which of the following statements about satellite cells is accurate?

<p>They regulate the microenvironment around neuronal cell bodies. (A)</p> Signup and view all the answers

Which neuroglial cell can myelinate multiple axon segments in the central nervous system?

<p>Oligodendrocytes (D)</p> Signup and view all the answers

What distinguishes Schwann cells from oligodendrocytes?

<p>Schwann cells myelinate one axon segment. (B)</p> Signup and view all the answers

What is a distinguishing feature of fibrous astrocytes compared to protoplasmic astrocytes?

<p>They exhibit few long and relatively straight processes. (B)</p> Signup and view all the answers

Which neuroglial cell type is primarily responsible for the formation of the blood-brain barrier?

<p>Astrocytes (D)</p> Signup and view all the answers

What function distinguishes Schwann cells from oligodendrocytes in terms of myelination?

<p>They myelinate short segments of individual axons. (D)</p> Signup and view all the answers

What role do microglia play in the nervous system?

<p>They are phagocytic cells that eliminate damaged cells. (C)</p> Signup and view all the answers

Which characteristic is true about ependymal cells?

<p>They secrete cerebrospinal fluid. (B)</p> Signup and view all the answers

Which of the following statements best describes satellite cells?

<p>They provide a regulatory microenvironment for neurons. (C)</p> Signup and view all the answers

Which neuroglial cell is known for its ability to migrate throughout nervous tissue?

<p>Microglia (B)</p> Signup and view all the answers

Which of the following correctly matches neuroglial cells with their location?

<p>Microglia - Central Nervous System (B)</p> Signup and view all the answers

Flashcards

Astrocytes in CNS

Star-shaped glial cells with processes, that support neurons and form the blood-brain barrier.

Oligodendrocytes in CNS

Glial cells that myelinate CNS nerve fibers (axons). One cell can myelinate a short segment of several axons.

Microglia in CNS

Small glial cells that migrate and are phagocytic, removing damaged cells and microorganisms.

Ependymal cells in CNS

Cuboidal cells lining the CNS cavities, secreting CSF.

Signup and view all the flashcards

Schwann cells in PNS

Glial cells that myelinate PNS nerve fibers (axons). One cell can myelinate one axon segment.

Signup and view all the flashcards

Satellite cells in PNS

Glial cells that surround neuronal cell bodies in PNS ganglia, providing support and regulation.

Signup and view all the flashcards

Blood-brain barrier

Protective barrier formed by astrocytes, regulating the entry of substances into the CNS.

Signup and view all the flashcards

Cerebrospinal fluid (CSF)

Fluid secreted by ependymal cells, that cushions the CNS.

Signup and view all the flashcards

Neuroglia

Supporting cells of the nervous system, providing essential functions for neurons.

Signup and view all the flashcards

Types of neuroglia

Neuroglia are categorized based on their location: central nervous system (CNS) and peripheral nervous system (PNS).

Signup and view all the flashcards

Astrocytes

Star-shaped glial cells found in the CNS, providing structural support and forming the blood-brain barrier.

Signup and view all the flashcards

Oligodendrocytes

Glial cells in the CNS responsible for myelination of axons, allowing faster nerve impulse transmission.

Signup and view all the flashcards

Microglia

Small glial cells in the CNS that act as phagocytes, removing debris and pathogens.

Signup and view all the flashcards

Ependymal cells

Cuboidal cells lining the cavities of the CNS, producing cerebrospinal fluid (CSF).

Signup and view all the flashcards

Schwann cells

Glial cells in the PNS responsible for myelination of axons, providing insulation and faster nerve impulse transmission.

Signup and view all the flashcards

Satellite cells

Glial cells in the PNS that surround neuronal cell bodies in ganglia, providing support and regulation.

Signup and view all the flashcards

Study Notes

Nervous Tissue

  • Nervous tissue is composed of neurons and neuroglia
  • Neuroglia are significantly more abundant than neurons (approximately 10x more)
  • Neuroglia are categorized by their location: central nervous system (CNS) and peripheral nervous system (PNS)

Neuroglia Classification

  • Central Nervous System (CNS): Astrocytes, Oligodendrocytes, Microglia, Ependymal cells
  • Peripheral Nervous System (PNS): Schwann cells, Satellite cells

Astrocytes

  • Star-shaped glial cells with radiating processes
  • Two types: Fibrous (few, long, straight processes) and Protoplasmic (many, short, branching processes)
  • Function:
    • Contribute to the blood-brain barrier
    • Provide structural support
    • Regulate ion, nutrient, and dissolved gas concentrations
    • Absorb and recycle neurotransmitters
    • Form scar tissue after injury

Oligodendrocytes

  • Glial cells responsible for myelination in the CNS
  • Single oligodendrocyte can myelinate multiple nerve fibers (axons)

Microglia

  • Small, glial cells with short, irregular processes
  • Abundant as neurons
  • Mobile, migrating cells
  • Phagocytic cells, removing damaged cells and microorganisms in the nervous tissue
  • Remove cell debris, wastes, and pathogens

Ependymal Cells

  • Cuboidal-shaped cells lining the central canal of the spinal cord and brain ventricles
  • Secrete cerebrospinal fluid (CSF)
  • Assist in producing, circulating, and monitoring of cerebrospinal fluid

Schwann Cells

  • Glial cells responsible for myelination in the PNS
  • Unlike oligodendrocytes, one Schwann cell myelinates a single axon segment
  • Participate in repair process after injury

Satellite Cells

  • Capsular cells surrounding neuron cell bodies in ganglia
  • Provide supportive, nourishing, insulating, and regulating functions for the neurons in their microenvironment
  • Surround neuron cell bodies in ganglia, regulating O2, CO2, nutrient, and neurotransmitter levels around neurons in ganglia

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

More Like This

Nervous Tissue and Neuroglia
8 questions

Nervous Tissue and Neuroglia

StylizedVitality6510 avatar
StylizedVitality6510
Nervous Tissue: Neuroglia and Neurons
44 questions
Use Quizgecko on...
Browser
Browser