Copy of 47_musculoskeletal outline_class

Copy of 47_musculoskeletal outline_class - The...

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Unformatted text preview: The Musculoskeletal System Chapter 47 Types of Skeletal Systems Three types: 1. Hydrostatic skeletons 2. Exoskeletons 3. Endoskeletons Hydrostatic Skeletons Found in both terrestrial & aquatic organisms Examples: Echinoderms (starfish, sea urchins) Cnidarians (jellyfish) nematodes 3 Hydrostatic Skeletons 4 Locomotion in earthworms 5 6 Endoskeletons Echinoderms have calcite (CaCO 3 ) skeletons Vertebrate bone = calcium phosphate [Ca(H 2 PO 4 )2] Endoskeletons cont Can change & remodel in response to injury or physical stress Bone Bones can be classified by the 2 fundamental modes of development 1. Intramembranous development 2. Endochondral development 9 Intramembranous development 10 Osteoblasts initiate bone development The cells communicate through little canals termed canaliculi Osteoclasts break down the bone matrix 11 ndochondral (Intracartilaginous) development Begin as tiny cartilaginous models Calcification begins with the fibrous sheath, later called the periosteum Trapped osteoblasts transform into osteocytes Osteoclasts remodel bone 12 Endochondral development cont Increase in length Limb bones have a shaft with epiphyses Plates are cartilage in growing bone 13 14 Bone Structure...
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This note was uploaded on 06/13/2011 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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Copy of 47_musculoskeletal outline_class - The...

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