TAILIEUCHUNG - Ebook Embryology at a glance: Part 2

(BQ) Part 2 book "Embryology at a glance" presents the following contents: Skeletal system (ossification), skeletal system, muscular system, respiratory system, digestive system - Gastrointestinal tract, urinary system, endocrine system, central nervous system, peripheral nervous system,. | Skeletal system ossification Figure Mesenchymal cells condense and form a model of the future bone Hypertrophic chondrocytes Perichondrium Figure Mesenchymal cells differentiate into chondrocytes and the matrix becomes calcified in the future diaphysis Osteoblasts Primary centre of ossification ----Periosteum bone forming beneath Figure Blood vessels invade bringing progenitor cells that become osteoblasts and haematopoietic cells Bony spicules Diaphysis Epiphysis Figure The diaphysis becomes ossified but the epiphyses remain cartilaginous Secondary centre of ossification Figure Later the epiphyses also begin to ossify Figure Mesenchymal cells form a condensation between 2 developing bones Figure With the epiphyses and diaphysis ossified the bone continues to grow in length from the growth plates. Eventually the growth plates also ossify and growth ceases Stages of endochondral ossification Figure Mesenchymal cells become organised into layers and differentiate into different cell types in this case the tissues of a synovial joint Joint development Embryology at a Glance First Edition. Samuel Webster and Rhiannon de Wreede. 50 2012 John Wiley Sons Ltd. Published 2012 by John Wiley Sons Ltd. Time period week 5 to adult Introduction Mesodermal cells form most bones and cartilage. Initially an embryonic loosely organised connective tissue forms from mesoderm throughout the embryo referred to as mesenchyme. Neural crest cells that migrate into the pharyngeal arches are also involved in the development of bones and other connective tissues in the head and neck see Chapters 39-42 . Bones begin to form in one of two ways. A collection of mesenchymal cells may group together and become tightly packed condensed forming a template for a future bone. This is the start of endochondral ossification Figure . Alternatively an area of mesenchyme may form a hollow sleeve roughly in the shape of the future bone. This is how .

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• Systems development
• Skeletal system
• Skeletal system
• Muscular system
• Respiratory system
• Urinary system
• Endocrine system
• Systems development life cycle
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• Lecture Accounting information systems
• Hệ thống thông tin kế toán
• Systems analysis
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• Lecture Accounting information systems
• Business system development
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• Selecting systems development projects
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• Introduction to MIS
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