BIO 240 1st Edition Lecture 6 Outline of Last Lecture A Stem Cells B Tissue Repair II Connective Tissue A Types B Characteristics Outline of Current Lecture C Functions D Loose and Dense Connective Tissue Types E Specialized Connective Tissue Current Lecture iii Matrix Is composed of the ground substance and fibers 1 Ground substance a Liquid b Semi semi liquid to semi solid gel like c Solid 2 Fibers a Collagen Big and wide stains smooth b Elastic Stains dark purple to black Can be long and wavy or short and blunt c Reticular Stains dark purple to black like elastic but tends to have branches in it iv Highly vascularized there is a blood supply 1 The exception is cartilage it is not highly vascularized This is why cartilage takes longer to heal than bone C Functions i For binding and support tendons and ligaments ii For protection skin forms a barrier to keep toxins out iii For insulation and nutrient storage adipose tissue iv For transportation blood D Loose and Dense Connective Tissue Types i Loose Connective tissue 1 Areolar loose connective tissue Acts like a sponge to soak up excess fluid edema swelling when fluid leaks out of cells These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 2 Adipose loose connective tissue Insulation and nutrient storage and protection Maintains homeostasis with internal body temperature Stores good nutrients that can be tapped into as well as a storage site for toxins Always a layer of fat around the kidneys act as a shock absorber There s hardly any ground substance in adipose loose connective tissue because the cells are inflated with lipid and take up so much space 3 Reticular loose connective tissue Supports lymphatic organs such and lymph node and spleen The reticular fibers in this tissue form stroma There are lots of cells fairly close together surrounded by reticular fibers a Stroma A scaffold formed by reticular fibers Like the springs on a mattress the support system for lymphatic organs ii Dense connective tissue The main purpose of dense connective tissue is strength and protection It has a gel matrix and mostly collagen fibers 1 Regular dense connective tissue The collagen fibers run parallel There s a little bit of extracellular space between the collagen fibers where the nuclei get pushed a Ligaments Attach bone to bone b Tendons Attach muscle to bone c Aponeurosis Attach muscle to muscle Ex The linea alba the Aponeurosis that connects your right abs to your left abs 2 Irregular dense connective tissue Forms sheaths sacs around structures You can find it around organs joints and in the skins dermis Has more extracellular space than regular dense connective tissue 3 Elastic dense connective tissue Predominately elastic fibers for stretching and retracting You can find it in your vocal chords the walls of your large arteries like the aorta and in the flavum ligamentum elastic dense connective disuse that connects your vertebrae together E Specialized Connective Tissue i Cartilage 1 Characteristics a Semi solid to solid matrix b Not very vascularized c Has Chondroblasts cells that make the cartilage and then mature into chondrocytes when their done secreting the matrix They re chondrocytes when they have backed themselves into a hole and are completely surrounded by matrix i Lacuna The open space in the matrix that houses the chondrocyte 2 Types a Hyaline cartilage The most abundant Commonly called gristle Found in the nose larynx tracheal rings articular cartilage and costal cartilage b Elastic cartilage Is rubbery and pliable the main fiber is elastin It is found in the external ear and epiglottis c Fibrocartilage Compilation of dense connective tissue and hyaline cartilage It s main fiber is collagen and its found between your vertebrae in you intervertebral discs in your meniscus and public symphysis The main job of fibrocartilage is shock absorption
View Full Document
Unlocking...