Session 1 Introduction Flashcards
Developmental origin of bones, connective tissue and skeletal muscle
Mesoderm of trilaminar disc
Functions of bone 6
- Support
- Storage
- Metabolic
- Movement
- Protection
- Haemoatopoiesis
SS MM P H
Characteristics of skeletal muscle
Striated and voluntarily controlled
Functions of skeletal muscle 6
- Locomotion
- Posture
- Metabolic
- Venous return
- Heat production
- Continence
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Metabolic roles of bone
Homeostasis of calcium and phosphate, storage and release
Storage roles of bone
Calcium and phosphate, protein, bone marrow rich in fat, growth factors and cytokines
What do tendons and ligaments do
Tendons Connect muscle to bone
Ligaments connect bone to bone
What is fascia
Sheets of connective tissue which envelop groups of muscles and divide body parts, protective function
What is hyaline cartilage
Found at ends of bones contributing to joints, for frictionless motion
What is fibrocartilage
For shock absorption, increases bony congruity, higher collagen content
E.g. menisci of knee
What is synovial membrane
Tissue found within joints, bursae and tendon sheaths. Produces synovial fluid which lubricates joints
Bone components are divided into
Cellular and non-cellular
Cellular components of bones
Osteocytes, osteoblasts, osteoclasts
Also fibroblasts, macrophages, mast cells and adipocytes
What mineralises the extracellular matrix
Calcium phosphate
Major fibre type in bone and other contents
Collagen, not much elastin,
Bone also contains water, glycosaminoglycans, proteoglycans
2 major components giving bone its mechanical properties are
Collagen and calcium phosphate
Collagen- tensile strength
Calcium phosphate- Compressive strength
Osteoblast role
OsteoBlast = Builder
Synthesise new bone, migrate over matrix, synthesise and deposit osteoid (matrix protein) and deposit calcium phosphate into it
Osteoclast role
Multi nucleated cells which secrete acidic chemicals to dissolve bone.
Minerals in ionic form are absorbed into osteoclast and released into extracellular fluid
Resorption
osteoblasts form osteocytes when they are
Trapped within the bone matrix in lacunae. Become involved in signalling processes. Communicate via filipodia (projections)
Two types of bone
Compact (dense outer layer) and spongy bone/cancellous bone (meshwork of trabeculae)
2 divisions of skeleton
Axial and appendicular skeleton
Long bones features
- Diaphysis is the shaft
- Flares out at each end to metaphysis, adjacent to growth plate, on other side is epiphysis
- Articulating surfaces covered in hyaline cartilage
- other bony surfaces covered with periosteum
- Medullary cavity lined with endosteum
What is in medullary cavity
red marrow in child, high fat content in adults, nutrient artery supplies marrow
What are sesamoid bones
Bones embedded in tendons