Tissues, Part 4 - Types of Connective Tissues: Crash Course Anatomy & Physiology #5

Today Hank wraps up our look at connective tissues with a discussion of their various types. Also chicken.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Chapters:
Introduction: We're All Just Meat 00:00
Loose vs. Dense Connective Tissue Proper 2:10
Types of Loose Tissue Proper: Areolar, Adipose, and Reticular 2:56
Types of Dense Tissue Proper: Regular, Irregular, and Elastic 4:04
Types of Cartilage: Hyaline, Elastic, and Fibro 5:24
Types of Osseous (Bone) Tissue: Spongy and Compact 6:33
Blood is a Connective Tissue 7:14
Review 8:51
Credits 9:47

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[anitacheung]

Types of connective tissue
Proper connective tissue (most diverse)
• Loose (e.g. skin) a lot of ground substances, fewer fibres, more cells and elastic fibre helps go back into shape, collagen helps anchor (stable) it (won't snap)
◦ Areolar (the most common)
‣ Find under epithelial tissue and around organs
‣ Random arrangement of fibres, a few fibroblast cells
‣ Holds at water
◦ Reticular
‣ Mostly made up of reticular fibres
‣ Find in lymph node bone marrow, and supports developing blood cells
‣ Hold blood in place
◦ Adipose (fat tissue)
‣ Mostly cells
‣ Store lipids, insulate the body against heat loss
• Dense (e.g. tendon, ligament) a lot of collagen, great resistance to tension
◦ Regular
◦ Irregular
‣ Thicker fibers
‣ collagen fibres arranged irregularly
‣ Fibroblasts
‣ Found in places that exert tension in a lot of direction
‣ E.g. dermis under our skin
◦ Elastic
‣ Find in Joint
‣ made of elastic fibres
‣ E.g. connecting vertebrae, some largest artery wall
‣ Provides support and flexibility

Cartilage connective tissue (White)
• Hyaline (the most common type)
◦ Chondrocytes and lacunae
◦ Glassy and transparent
◦ Ground substance, proteoglycans, collagen fibres(just a little bit)
◦ Provide pliable support
◦ E.g. the connection between sternum and ribs
◦ E.g. Nose Bridge
• Elastic
◦ Chondrocytes, elastic fibers
◦ Provide strength and stretchability
• Fibro
◦ Chondrocyte, thick fibres of collagen
◦ Shockes absorber, standing pressure
◦ E.g. Disc between your vertebrae, knee joint

Bone connective tissue (osseous tissue)
• Spongy
◦ Strong, porous
◦ Internal layers of bone
◦ Uses porous to make and store bone marrow
◦ E.g. flat bones like sternum
• Compact
◦ External layers of your bones
◦ Store calcium

Blood Connective tissue (no fibre, but a lot of protein)
• Plasma
◦ Ground substance and protein fibres
• Erythrocytes (red blood cells)
• Leukocytes (White blood cells)
• Platelets

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So when humans sit in the sun/tanning beds they are essentially roasting their bodies and breaking down all that beautiful collagen.

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