Chapter 5


The Skeletal System
I. Divisions of the Skeletal System

 The axial skeleton – bones of
  the center of the body; spine,
  cranium,
 The app...
II. Functions of Bones
 Support against gravity – supports the body
    and anchors the organs; act as pillars to hold
  ...
III. Classification of Bones
 206 bones in the body
 Two types of bone:
   Compact  bones is dense and looks smooth
   ...
III. Classification of Bone
 Classification based on Shape
   Long  bones – longer than they are wide;
    shaft with a ...
III. Classification of Bones
 Irregular bones – “catch-all” group; any
  bones that do not fit with the other
  groups; v...
IV. Structure of a Long Bone
 The diaphysis (shaft) makes up most of
  the bone’s length and is composed of
  compact bon...
IV. Structure of a Long Bone
 At each end of the long bones is the
  epiphysis.
 Each epiphysis consists of a thin layer...
IV. Structure of a long bone
 Thin line of bony tissue spanning the
  epiphysis that looks a bit different from
  the res...
IV. Structure of a long bone
 The shaft is a storage area for adipose
  tissue (fat). This is called yellow
  marrow cavi...
V. Bone Markings
 There are two categories of bone
 marking
   Projectionsor Processes – grow out from
    the bony surf...
V. Bone Markings
 Tuberosity – large rounded projectsion;
  make be roughened
 Crest – Marrow ridge of bone; usually
  p...
V. Bone Markings
 Line – Narrow ridge of bone; less
  prominent than a crest
 Tubercle – small rounded projection or
  p...
V. Bone Markings
 Head – Boney expansion carried on a
  narrow neck.
 Facet – Smoth nearly flat articular
  surface
 Co...
V. Bone Markings
 Meatus – Canal-like passageway
 Sinus – Cavity within a bone, filled with
  air and lined with mucous ...
V. Bone Markings
 Fissure – Narrow, slit like opening
 Foramin/Foramina – Round or oval
 opening through a bone
VI. Microscopic Anatomy
 Mature bone cells are called
  osteocytes.
 Osteocytes are found in tiny cavities
  withing the...
VI. Microscopic Anatomy
 Canaliculi are tiny canals that radiate
  outward from the central canals to all
  the lacunae
...
VI. Microscopic Anatomy
 Calcium salts make the bone hard.
 The organic parts (especially the
 collagen fibers) provide ...
VII. Bone Formation, Growth,
and Remodeling
 In an embryonic bone - mostly hyaline
  cartilage.
 The bones in a fetus ar...
VII. Bone Formation, Growth,
and Remodeling
 Ossification – bone formation
 Osteoclasts – bone destroying cells to
  rel...
VIII. Bone Fractures
 As you age, bones thin and weaken.
  Fractures are more common.
 Fractures are treated by reductio...
VIII. Bone Fractures
 Bones must be immobilized with a cast.
 Healing time for simple bones is 6 to 8
 months, but is lo...
VIII. Bone Fractures
 4 events of bone fractures
    A hematoma is formed. Blood vessels are
     ruptured and blood clo...
IX. Bone Fractures
 Simple fracture – Bone breaks cleanly,
  but doesn’t penetrate the skin.
 Compound fracture – Bone p...
IX. Bone Fractures
 Impacted Fracture – Broken bone ends
  are forced into each other
 Spiral Fracture – Ragged break
  ...
XIII. The Vertebral Column
 Formed of 26 irregular bones
 Protects and supports the spinal cord
 The sacrum is 5 fused ...
XIII. The Vertebral Column
 Young discs have more water content
  and are more flexible.
 Body or centrum – main part of...
XIII. The Vertebral Column
 Vertebral foramen – canal through which the
  spinal cord passes.
 Transverse process – two ...
XIII. The Vertebral Column
 The spine is divided into section:
   Cervical   vertebrae – first 7 vertebrae of the
    sp...
XIII. The Vertebral Column
 Thoracic vertebrae include 12 individual
 vertebrae.
   They  are number T1, T2, T3, etc.
  ...
XIII. The Vertebral Column
 The Lumbar Vertebrae
 5 Block-like vertebrae
 Hatchet shaped spinous process
 These are th...
XIII. The Vertebral Column
 Sacrum
   Fused  5 vertebrae
   The wing-like alae articulates with the hip
   Forms the p...
XIII. The Vertebral Column
 Coccyx
   Remant   of the tailbone that other
    vertebrates have.
   3 to 5 fused vertebr...
XIV. Bony Thorax or Thoracic
cage
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Chapter 5 Skeletal System

  1. 1. Chapter 5 The Skeletal System
  2. 2. I. Divisions of the Skeletal System  The axial skeleton – bones of the center of the body; spine, cranium,  The appendicular – bones of the limbs and girdles  Joints, cartilages, and ligaments
  3. 3. II. Functions of Bones  Support against gravity – supports the body and anchors the organs; act as pillars to hold up the body.  Protection – cranium protects the brain; ribs protect heart and lungs; vertebral column protects the spinal chord  Movement – Muscles use bones as levers for movement  Storage – fat is stored in bones as well as minerals such as calcium and phosphorus.  Hematopoiesis – forming blood cells
  4. 4. III. Classification of Bones  206 bones in the body  Two types of bone:  Compact bones is dense and looks smooth and hard; usually the shaft of a long bone.  Spongy bone is small needle like pieces of bone and lots of open space; usually the heads of a long bone.
  5. 5. III. Classification of Bone  Classification based on Shape  Long bones – longer than they are wide; shaft with a head on both ends; femur, humerous, radius, ulna.  Short bones – cube shaped; mostly spongy; wrist and ankle bones.  Flat bones – thin and flattened; usually curved. Two layers of compact bones sandwiching a layer of spongy bone; skull, rubs, sternum
  6. 6. III. Classification of Bones  Irregular bones – “catch-all” group; any bones that do not fit with the other groups; vertebrae and the hip bone.  BEGIN STUDYING THE CHART ON PAGE 115 AND 121. YOU WILL NEED TO KNOW ALL THESE!!!
  7. 7. IV. Structure of a Long Bone  The diaphysis (shaft) makes up most of the bone’s length and is composed of compact bone.  Covering the diaphysis is the periosteum (fibrous connective tissue)  Sharpey’s fibers secure the periosteum to the diaphysis.
  8. 8. IV. Structure of a Long Bone  At each end of the long bones is the epiphysis.  Each epiphysis consists of a thin layer of compact bone enclosing an area filled with spongy bone.  Articular cartilage, instead of periosteum, covers its external surface.  Articular cartilage is smooth glassy hyaline cartilage; reduces friction at joints.
  9. 9. IV. Structure of a long bone  Thin line of bony tissue spanning the epiphysis that looks a bit different from the rest of the bone. Its called the epiphysial line.  In young bones there is an epiphyseal plate made of cartilage that allows the bone to grow.
  10. 10. IV. Structure of a long bone  The shaft is a storage area for adipose tissue (fat). This is called yellow marrow cavity or the medullary cavity.  In infants this area makes blood cells and red marrow is found there.  KNOW THE CHART ON PAGE 115.
  11. 11. V. Bone Markings  There are two categories of bone marking  Projectionsor Processes – grow out from the bony surface  Depressions or cavities – indentations in the bone.
  12. 12. V. Bone Markings  Tuberosity – large rounded projectsion; make be roughened  Crest – Marrow ridge of bone; usually prominent  Trochanter – Very large blunt, irregularly shaped process (only on the femur)
  13. 13. V. Bone Markings  Line – Narrow ridge of bone; less prominent than a crest  Tubercle – small rounded projection or process.  Epicondyle – raised area above a condyle  Spine – Sharp, slender, often pointed projection
  14. 14. V. Bone Markings  Head – Boney expansion carried on a narrow neck.  Facet – Smoth nearly flat articular surface  Condyle – Rounded articular projection  Ramus – Armlike Bar of a bone
  15. 15. V. Bone Markings  Meatus – Canal-like passageway  Sinus – Cavity within a bone, filled with air and lined with mucous membrane  Fossa (shallow, basinlike depression in a bone, often serving as an articular surface.  Groove - Furrow
  16. 16. V. Bone Markings  Fissure – Narrow, slit like opening  Foramin/Foramina – Round or oval opening through a bone
  17. 17. VI. Microscopic Anatomy  Mature bone cells are called osteocytes.  Osteocytes are found in tiny cavities withing the matrix called lacunae.  The lacunae are arranged in circles called lamellae around a central Haversian canal.  These together make up an osteon.
  18. 18. VI. Microscopic Anatomy  Canaliculi are tiny canals that radiate outward from the central canals to all the lacunae  Bone is well vascularized and heals well.  Volkmann’s canals run at right angles to the shaft.
  19. 19. VI. Microscopic Anatomy  Calcium salts make the bone hard.  The organic parts (especially the collagen fibers) provide flexibility and great strength
  20. 20. VII. Bone Formation, Growth, and Remodeling  In an embryonic bone - mostly hyaline cartilage.  The bones in a fetus are about 60% bone/40% hyaline cartilage.  In a child, the Epiphyseal plate is still cartilage.  In adults, Epiphyseal plate is replace with bone leaving only the epiphyseal line.
  21. 21. VII. Bone Formation, Growth, and Remodeling  Ossification – bone formation  Osteoclasts – bone destroying cells to release calcium into the blood  Rickets – disease in children in which the bones fail to calcify – lack of calcium in the diet or vitamin D – Legs bow under the weight of the body.
  22. 22. VIII. Bone Fractures  As you age, bones thin and weaken. Fractures are more common.  Fractures are treated by reduction  Closed reduction – bones are coaxed back into their normal positions by the doctor.  Open reductions – surgery is performed and the bone ends are secured together with pins or wires.
  23. 23. VIII. Bone Fractures  Bones must be immobilized with a cast.  Healing time for simple bones is 6 to 8 months, but is longer for large bones and in elderly people.
  24. 24. VIII. Bone Fractures  4 events of bone fractures  A hematoma is formed. Blood vessels are ruptured and blood clots.  Fibrocartilage callus formation – slints the gap between the bones. Capillaries reform.  Bony callus formation – Fibrocartilage is replaced by bony callus  Bone remodeling – patch the bone permanently.
  25. 25. IX. Bone Fractures  Simple fracture – Bone breaks cleanly, but doesn’t penetrate the skin.  Compound fracture – Bone protrudes through the skin  Comminuted fracture – bone breaks into many pieces.  Compression – Bone is crushed  Depressed – Beon is pressed inward.
  26. 26. IX. Bone Fractures  Impacted Fracture – Broken bone ends are forced into each other  Spiral Fracture – Ragged break occurring when excessive twisting forces are applied to a bone.  Greenstick – Bone breaks incompletely much in the way a green twig breaks.
  27. 27. XIII. The Vertebral Column  Formed of 26 irregular bones  Protects and supports the spinal cord  The sacrum is 5 fused vertebrae  The coccyx is 4 fused vertebrae (tail bone)  Between individual vertebrae are intervertebral discs made of flexible fibrocartilage which cushion the vertebrae and absorb shock.
  28. 28. XIII. The Vertebral Column  Young discs have more water content and are more flexible.  Body or centrum – main part of the vertebra  Vertebral arch – formed from the joining of posterior extentions; the laminae and pedicles make up the vertebral arch
  29. 29. XIII. The Vertebral Column  Vertebral foramen – canal through which the spinal cord passes.  Transverse process – two lateral projections from the bertebral arch  Spinous process – single projection arising from the posterior aspect of the vertebral arch  Superior and inferior articular processes - paired projections lateral to the vertebral foramen, allowing a vertebra to form joins with adjacent vertebrae
  30. 30. XIII. The Vertebral Column  The spine is divided into section:  Cervical vertebrae – first 7 vertebrae of the spine. – First cervical vertebrae is called the atlas. The atlas has no body and articulates with the occipital condyles of the skull – Second cervical vertebrae is called the axis. The axis acts as a pivot for rotation of the atlas (and skull). The axis has a large process called the odontoid process or dens. – These are numbered C1, C2, C3, etc
  31. 31. XIII. The Vertebral Column  Thoracic vertebrae include 12 individual vertebrae.  They are number T1, T2, T3, etc.  The body of the vertebrae is somewhat heartshaped  The two demifacets on each side receive the ribs.  The spinous process is long hooks sharply downward.
  32. 32. XIII. The Vertebral Column  The Lumbar Vertebrae  5 Block-like vertebrae  Hatchet shaped spinous process  These are the sturdiest of the vertebrae  Labeled L1, L2, L3, etc.
  33. 33. XIII. The Vertebral Column  Sacrum  Fused 5 vertebrae  The wing-like alae articulates with the hip  Forms the posterior wall of the pelvis  The midline of the sacrum is roughened by the median sacral crest which is made from fused spinous processes.
  34. 34. XIII. The Vertebral Column  Coccyx  Remant of the tailbone that other vertebrates have.  3 to 5 fused vertebrae
  35. 35. XIV. Bony Thorax or Thoracic cage
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