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Chapter 29: Problem 18

Which of the following is a fibrous joint? a. suture b. planar joint c. hinge joint d. pivot joint

Short Answer

Expert verified
a. suture

Step by step solution

01

Understand Joint Types

First, review the different types of joints. Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. The main types of fibrous joints are sutures, syndesmoses, and gomphoses.
02

Define Fibrous Joint

A fibrous joint does not have a joint cavity and is typically immovable. Examples include sutures in the skull, syndesmoses between certain long bones, and gomphoses which anchor teeth.
03

Identify Joint Types in Options

Identify which option corresponds to a fibrous joint. a. Suture - A type of fibrous joint found between bones of the skull. b. Planar joint - A synovial joint. c. Hinge joint - Another type of synovial joint. d. Pivot joint - Also a synovial joint.
04

Select the Correct Option

The correct answer is (a) suture, as it is the only option listed that is a type of fibrous joint.

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Key Concepts

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

Types of Joints
Joints are classified based on their structure and function. The main types of joints are:
  • Fibrous Joints: These joints are connected by fibrous connective tissue and generally allow for little to no movement.
  • Cartilaginous Joints: These joints are connected by cartilage and allow for more movement than fibrous joints but less than synovial joints.
  • Synovial Joints: These joints have a fluid-filled joint cavity that allows for a wide range of movements.
Fibrous joints can be further subdivided into sutures, syndesmoses, and gomphoses. Sutures, for instance, are found between the bones of the skull.
Fibrous Connective Tissue
Fibrous connective tissue is primarily composed of collagen fibers. This tissue plays a crucial role in connecting and stabilizing bones within fibrous joints. The dense collagen fibers make the tissue both strong and flexible:
  • Immovability: Fibrous connective tissue ensures that the bones in fibrous joints do not move significantly, providing stability.
  • Protection: By limiting movement, fibrous connective tissue helps protect vital structures, such as the brain, by preventing bones from moving too much.
  • Types: Different forms of fibrous connective tissue are found in sutures, syndesmoses (a joint where the bones are connected by a ligament), and gomphoses (a joint that anchors teeth).
In short, this tissue is vital for the stability and protection of certain bones in the body.
Suture Joint
A suture joint is a specific type of fibrous joint found exclusively in the skull. In this type of joint, the bones interlock and are held together by dense connective tissue:
  • Interlocking Bones: The edges of the bones in a suture are jagged and interlock like puzzle pieces. This feature adds stability.
  • Immovable: Reflecting their role in protecting the brain, sutures are immovable joints, making sure the skull remains intact.
  • Development: In infants, sutures are not fully fused, allowing for growth and brain expansion. Over time, these gaps close as the bones fully fuse.
  • Examples: Common suture names include the coronal, sagittal, lambdoid, and squamous sutures, each connecting different bones in the skull.
Suture joints perform an essential function by securing the bones of the skull together while maintaining a level of flexibility during early development.

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