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Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes
Martini - Fundamentals of Anatomy and Physiology 12th Edition
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011Not the one you use?Change textbook
All textbooksMartini, Nath, Bartholomew 12th EditionCh. 13 The Spinal Cord, Spinal Nerves, and Spinal ReflexesProblem 21
Chapter 13, Problem 21

In which meningeal space is cerebrospinal fluid (CSF) found? What are the functions of CSF?

Verified step by step guidance
1
Identify the three meningeal layers surrounding the brain and spinal cord: dura mater (outermost), arachnoid mater (middle), and pia mater (innermost).
Understand that the cerebrospinal fluid (CSF) is located in the subarachnoid space, which is the space between the arachnoid mater and the pia mater.
Recognize that CSF also fills the ventricles of the brain and the central canal of the spinal cord, but the question focuses on the meningeal space, which is the subarachnoid space.
List the primary functions of CSF: cushioning the brain and spinal cord to protect them from mechanical injury, providing buoyancy to reduce the effective weight of the brain, removing waste products from the central nervous system, and maintaining a stable chemical environment.
Summarize that CSF acts as a protective fluid and a medium for nutrient and waste exchange within the central nervous system.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Meningeal Spaces

Meningeal spaces are potential or actual spaces between the layers of the meninges, which are protective membranes surrounding the brain and spinal cord. The main spaces include the epidural, subdural, and subarachnoid spaces. Cerebrospinal fluid (CSF) is specifically found in the subarachnoid space, located between the arachnoid mater and pia mater.
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Cerebrospinal Fluid (CSF)

CSF is a clear, colorless fluid produced mainly by the choroid plexus in the brain's ventricles. It circulates through the ventricular system and the subarachnoid space, providing a cushioning effect for the brain and spinal cord, and maintaining a stable chemical environment.
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Functions of Cerebrospinal Fluid

CSF serves multiple functions including mechanical protection by cushioning the brain, chemical stability by removing waste and distributing nutrients, and buoyancy which reduces the effective weight of the brain. It also plays a role in maintaining intracranial pressure and facilitating the exchange of substances between blood and nervous tissue.
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Related Practice
Textbook Question

Side-to-side movements of the spinal cord are prevented by the:

(a) Filum terminale

(b) Denticulate ligaments

(c) Dura mater

(d) Pia mater

(e) Arachnoid mater

Textbook Question

List, in sequence, the five steps involved in a neural reflex.

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Textbook Question

The subarachnoid space contains:

(a) cerebrospinal fluid

(b) lymph

(c) air,

(d) connective tissue and blood vessels

(e) denticulate ligaments.

Textbook Question

What five characteristics are common to all polysynaptic reflexes?

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Textbook Question

Why do cervical nerves outnumber cervical vertebrae?

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Textbook Question

Polysynaptic reflexes can produce far more complicated responses than can monosynaptic reflexes because

(a) The response time is quicker.

(b) The response is initiated by highly sensitive receptors.

(c) Motor neurons carry impulses at a faster rate than do sensory neurons.

(d) The interneurons involved can control several muscle groups.

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