Mesenchyme (E)

Mesenchyme (E)

1. Fibroblast

   • Fibrocyte
     • Connective Tissue Proper
       • Loose Connective Tissue(M)
         • Areolar
           • F: strength, elasticity, support, "all-purpose"
           • L: widely distrib. subQ, papillary of dermis, around BVs, nerves, organs
         • Adipose
           • L: wherever areolar CT found, subQ, arnd. heart and kidneys, y. bone marrow, padding arnd. joints
           • F: reduces heat loss, energy reserve, supports and protects organs
           • "popcorn"
         • Reticular
           • F: forms stroma of organs, binds together smooth muscle tissue cells, filters and removes worn- out blood cells
           • L: stroma of liver, spleen, lymph nodes, red bone marrow
           • "scaffolding" for soft organs
       • Dense Connective Tissue(M)
         • Regular
           • L: forms tendons and most ligaments
           • F: provides strong attachment between various structures, withstands pulling tension well
           • "rope"
         • Irregular
           • L: occurs in sheets like fasciae, reticular region of dermis, fibrous pericardium of heart, periosteum of bone, perichondrium of cartilage, joint capsules, membrane capsules around various organs, heart valves
           • F: provides tensile strength in many directions
           • SKIN, fibers going every which direction
         • Elastic
           • L: lung tissues, walls of arteries, trachea, true vocal cords, susp. lig. of penis, some lig. between vertebrae
           • F: allows stretching of organs, can recoil
           • "wavy"

2. Chondroblast

   • Chondrocyte
     • Cartilage(M)
       • Hyaline
         • L: most abundant! ends of long bones, anterior ends of ribs, nose, parts of larynx, trachea, bronchi, bronchial tubes, embryonic & fetal skeleton
         • F: provides smooth surfaces for movement at joints, flexibility & support,
         • weakest of 3 types, can be fractured :(
       • Fibrocartilage
         • L: pubic symphysis, intervertebral discs, menisci, portions of tendons into cartilage
           • F: support & joining structures together
         • W/ combo of strength and rigidity- it's the STRONGEST!
       • Elastic
         • L: epiglottis, auricle, auditory (eustachian) tubes
         • F: strength, elasticity, maintains shape of structures

3. Osteoblast

   • Osteocyte
     • Osseous (bone)(M)
       • Compact
         • F: support, protection, lever for muscle movement, houses blood-forming tissue
       • Spongy (cancellous) bone
         • F: support, protection, lever for muscle movement

4. Hematopoietic stem cell

   • Blood cells (and macrophages)
     • Blood (M)
       • Erythrocytes (RBC)
         • F:transport oxygen and carbon dioxide
       • Leukocytes (WBC)
         • F: phagocytosis, involved in allergic reactions, immune system responses
       • Thrombocytes (platelets)
         • F: blood clotting
       • L:Within BV, chambers of heart
     • Fluid Connective Tissue
       • Lymph

5. Connective Tissue-Protein fibers, Ground Substance, and Cells

6. Mucous (E)

7. Supporting Connective Tissue