PP14 Tissue Structure and Organization 2

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PP14Tissue Structure and Organization 2

• Chapter 2 pg 7-18
• ANS 3043
• University of Florida
• Dr. Michael J. Fields

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More on Connective Tissue

• Loose Connective Tissue
• Contains few collagen and elastin fibers
• Loosely associated providing maximum flexibility
• Little strength and rigidity
• Highly vascularized and contains numerous cells
• Provides structure to blood vessels and nerves
• Acts as packing material between some organs

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More on Connective Tissue

• Dense Connective Tissue
• Contains numerous collagen and elastin fibers for
  maximal strength and little flexibility
• Types
• Regular fibers arranged in parallel bundles
• Tendons (muscle to bone)
• Ligaments (bone to bone)
• Irregular thick mat of fibers running in all
  directions
• Dermis of skin
• Mammary gland

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Regular Dense Connective Tissue in Ligament
Regular dense connective tissue parallel
Parallel fibers Knee injury
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Tissue Structure and Organization
b Irregular thick mat of fibers running in
all directions

• Dermis of skin, mammary gland

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Dense Irregular Connective Tissue of Mammary Gland
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More on Connective Tissue

• Specialized Connective Tissue
• Adipose Tissue (Figure 2.9)
• Loose connective tissue containing fibroblasts
  and adipocytes
• Highly vascularized for mobilization
• Function energy storage, cushion, insulation,
  protective covering of nerves
• Blood and Lymph (hematopoetic)
• Fluid phase is viscous with numerous soluble
  proteins
• No filamentous proteins

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More on Connective Tissue

• Cartilage (Figures 2.12, 2.13)
• Form of connective tissue that provides
  structural support to other tissues
• Forms temporary skeleton of fetus and a model for
  bone development
• Ground substance or matrix is very rigid
• Hyaluronic acid, chondroitin 4-sulfate, keratin
  sulfate
• Nutrients fuse through matrix to nourish
  chondrocytes

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Cartilage in Trachea
No vascularization
Cells in lacunae that secrete cartilage
Outside layer
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Cartilage

• Chondrocytes cartilage producing cells
• Located in small vacuoles called lacunae
  throughout matrix
• Perichondrium
• No direct vascular supply
• Membrane of fibrous connective tissue around
  surface of cartilage (nonjoint associated)

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Cartilage

• Types of Cartilage Growth
• Interstitial Growth
• Occurs within the tissue
• Chondrocytes divide to form new lacunae
• Appositional Growth
• Growth that occurs by addition of new layers at
  the interface between the perichondrium and
  cartilage

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Cartilage

• Types of Cartilage
• Hyaline
• Translucent with a bluish color
• Numerous collagen fibers (40) packed within
  ground substance
• Extremely tough and somewhat flexible
• Resistant to constant pressure and friction
• Located at ventral end of rib, joint surfaces,
  trachea and in the developing fetus

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Cartilage

• Elastic
• Contains numerous elastin fibers and some
  collagen fibers
• Maximum flexibility and less rigid structure
• Located in ears, eustachian tubes and epiglottis
• Fibrocartilage
• Consists of mostly collagen with little ground
  substance
• Extremely tough
• Chondrocytes arranged in rows
• Located between pelvic bones at pubis and
  vertebrae of spine
• Associated with some tendons and ligaments

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Elastic Cartilage in Ear
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Fibrocartilage of Intervertebral Disc