lecture13 - OBJECTIVES Types of skeletal tissues &...

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OBJECTIVES Bone – functions, types & structure (ultra- micro- and macro- structure)
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Various types of skeletal tissues Cartilage Bone Tendon Ligament
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Various types of skeletal tissues Cartilage (Contacting surfaces of long bone – cushions direct bone-to-bone contact) Bone (Main structural element – provides shape to the skeleton) Tendon (Link element – connects bone to the muscle) Ligament (Link element – connects bone to bone)
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Origin of skeletal tissues Embryogenesis Fertilization followed by rapid cell division Blastocyst attaches to the uterus wall Trilaminar embryonic discs (3 weeks) – Ectoderm, Mesoderm Mesoderm and part of ectoderm contain mesenchymal stem cells from which the entire skeletal system is formed.
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Origin of skeletal tissues Skeletal Pattern Formation 4 weeks – upper and lower limb buds form 5-7 weeks - musculoskeletal elements begin to form (Involuntary contraction) 8 weeks – Differentiation of bone and joint complete
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Origin of skeletal tissues Skeletal Pattern Formation 60 days – embryonic period ends & fetal life begins 11 weeks – ossification of the endoskeleton Muscular system exert load on the ossifying skeletal elements
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Growth and Development of Skeletal system Skeletal system continues to grow by allometric (different in different direction) growth until skeletal maturity.
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lecture13 - OBJECTIVES Types of skeletal tissues &...

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