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Published byElvin Singleton Modified over 9 years ago
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NEW SEATING CHART! Numbers will be drawn for your new seating chart when the bell rings. Numbers will be drawn for your new seating chart when the bell rings.
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WARM UP 12/17 1. Write down 7 things you know about bones. 2. Write down 5 things you want to learn about bones.
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Notes Ch 6 12/17 The skeletal system
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Skeletal system tissues: 1. Bone 2. Cartilage (connective)
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Functions: 1. Support – (structure for the body) 2. Protection – (bones around organs) 3. Movement – (place for muscles to attach to) 4. Mineral storage 5. Hemopoieses – makes blood cells Child – all bones Child – all bones Adult – sternum, ribs, vertebrae, illium crest Adult – sternum, ribs, vertebrae, illium crest femur, humerus femur, humerus
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Development OSTEOGENESIS – bone formation Bones form 3 months after fertilization from the mesoderm layer (still cartilage, but shape of bones) (still cartilage, but shape of bones) OSSIFICATION – the process of cartilage changing to bone (until about 3 yrs old)
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BONE - main parts 1. DIAPHYSIS – main long portion 2. EPIPHYSIS – the 2 ends 3. ARTICULAR CARTILAGE – thin layer of hyaline cartilage; cushions ends 4. MEDULLARY CAVITY – hollow center of bone; contains marrow 5. MARROW – liquid connective tissue that forms blood cells 6. ENDOSTEUM – membrane lining the medullary cavity
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7. PERIOSTEUM – * dense tissue covering bone * dense tissue covering bone * contains blood vessels that branch * contains blood vessels that branch into bone into bone * made of osteocytes – bone cells * made of osteocytes – bone cells 8. COMPACT BONE – area with tightly packed osteocytes 9. SPONGY BONE – area with loosely packed osteocytes
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4 types of bone 1. Long – arms, legs, hands, feet 2. Short – wrist, fingers, ankles, toes 3. Flat – ribs, skull, shoulder blade, pelvis… 4. Irregular – ear, vertebrae, jaw…
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Long bone – has all parts Short, flat, irregular bone – only spongy, compact, periosteum, and marrow
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LABELING 1. Epiphysis 2. Diaphysis 3. Epiphysis 4. Articular cartilage 5. Spongy bone 6. - 7. Compact bone 8.Medullary cavity 9.Endosteum 10.Marrow 11.periosteum
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BONE MARKINGS LAB 1. FOSSA – shallow depression or indentation 2. FORAMEN – hole through a bone 3. TURBERCLE – small projection (bump); not on ends (< pea size) 4. HEAD – rounded expansion from a neck- like area 5. FISSURE – narrow slit- like opening 6. CONDYLE – round projection on the end 7. TROCHANTER – large projection; not on end (>pea size) 8. SPINUS PROCESS – sharp or pointed projection 9. CREST – raised long edge 10. FACET – smooth flat end
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