Lecture Five : Joints I - Bone growth joints (tissues and structures)

7 important questions on Lecture Five : Joints I - Bone growth joints (tissues and structures)

Describe the general principles of bone growth

Bone starts off as a cartilaginous model (6 weeks after fertilization). Overtime, cartilage is transformed to bone - this process is called ossification.
1. Primary Centre of Ossification
  • Occurs in the diaphysis (shafts)
  • Epiphyses remain cartilage
  • Develop at different times depending on the bone.
  • Growth in width = Appositional growth

2. Secondary Centre of Ossification
  • Enabled by epiphyseal plates (growth plates)
  • Growth in length = Through the growth plate

What are the components and functions of the Hyaline Cartilage ?

  • Made up of collagen fibres which are barely visible.
  • It has a smooth, frictionless surface and also high water content in matrix.

FUNCTIONS :
  • Resist compression
  • Moulds the ends of bones where they articulate , so they can provide smooth, frictionless movements.

What are the components and functions of the Fibrocartilage ?

  • Contains more collagen than hyaline cartilage. These collagen fibres are arranged into bundles throughout the matrix which are aligned to the stresses.
  • Has a lower water content compares to Hyaline Cartilage.
  • Found in different parts of the skeleton where different functions are required.

FUNCTION :
  • Resist tension and compression
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What is a ligament ?

  • Ligaments are connective tissues that connects bone to bone.
  • Its function is to restrict movement (away from themselves)

What are the common features in BOTH ligaments and tendons ?

  • Contain collagen
  • Made of Dense Fibrous Connective Tissue (DFCT)
  • Some vascularity but minimal compared to bone
  • Have fibroblasts/clasts

Explain what is a Cartilaginous Joint ?

A cartilaginous joint is made of fibrocartilage connective tissues.
  • Has some mobility but moderately stable.
  • Has various different structures with different functions
  • Examples are rib cartilages, intervertebral discs and pubic symphysis  

Explain what is a Fibrous Joint ?

A fibrous joint is made up of Dense Fibrous Connective Tissue (DFCT)
  • Has little to no mobility but is very stable
  • Its structures are ligaments
  • Functions include limit movement and provides stability
  • Example is the cranial sutures

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