PowerPoint Lecture Slides. Prepared by Patty Bostwick-Taylor, Florence-Darlington Technical College. The Skeletal System Pearson Education, Inc.

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1 PowerPoint Lecture Slides Prepared by Patty Bostwick-Taylor, Florence-Darlington Technical College CHAPTER 5 The Skeletal System 2012 Pearson Education, Inc.

2 Title Classification of Bones and Gross Anatomy of Long Bones Essential Question Describe how bones are classified. Describe the gross anatomy of long bones.

3 The Skeletal System Parts of the skeletal system Bones (skeleton) Joints Cartilages Ligaments Two subdivisions of the skeleton Axial skeleton Appendicular skeleton

4 Functions of Bones Support the body Protect soft organs Skull and vertebrae for brain and spinal cord Rib cage for thoracic cavity organs Allow movement due to attached skeletal muscles Store minerals and fats Calcium and phosphorus Fat in the internal marrow cavity Blood cell formation (hematopoiesis)

5 Bones of the Human Body The skeleton has 206 bones Two basic types of bone tissue Compact bone Homogeneous Spongy bone Small needle-like pieces of bone Many open spaces Figure 5.2b Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.3

6 Spongy bone Compact bone Figure 5.1

7 Figure 5.2

8 Classification of Bones Long bones Typically longer than they are wide Shaft with heads situated at both ends Contain mostly compact bone All of the bones of the limbs (except wrist, ankle, and kneecap bones) Examples: Humerus, ulna, radius Metacarpals, metatarsals Phalanges (on both hands and feet) Femur, tibia, fibula Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.4a

9 Figure 5.2a

10 Classification of Bones Short bone Generally cube-shaped Contain mostly spongy bone Includes bones of the wrist and ankle Sesamoid bones are a type of short bone which form within tendons (patella) Examples: Carpals, tarsals Talus, calcaneus patella Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.4b

11 Figure 5.2d

12 Classification of Bones Flat bones Thin and flattened curved Thin layers of compact bone around a layer of spongy bone Examples: All skull bones Sternum Clavicle Scapula All ribs Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.5a

13 Spongy bone Compact bone Figure 5.1

14 Figure 5.2c

15 Classification of Bones Irregular bones Irregular shape Do not fit into other bone classification categories Example: All vertebrate All bones of the pelvic girdle Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.5b

16 Figure 5.2b

17 Structures of a Long Bone Figure 5.2a Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.8b

18 Gross Anatomy of a Long Bone Diaphysis Shaft Composed of compact bone Figure 5.2a Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.6

19 Gross Anatomy of a Long Bone Epiphysis Ends of the bone Composed mostly of spongy bone Figure 5.2a Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.6

20 Structures of a Long Bone Periosteum Outside covering of the diaphysis Fibrous connective tissue membrane Figure 5.2c Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.7

21 Structures of a Long Bone Sharpey s fibers Secure periosteum to underlying bone Figure 5.2c Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.7

22 Structures of a Long Bone Arteries Supply bone cells with nutrients Figure 5.2c Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.7

23 Structures of a Long Bone Articular cartilage Covers the epiphyses Made of hyaline cartilage Decreases friction at joint surfaces Figure 5.2a Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.8a

24 Articular cartilage Compact bone Spongy bone (b) Figure 5.3b

25 Structures of a Long Bone Medullary cavity Contains yellow marrow (mostly fat) in adults Contains red marrow (for blood cell formation) in infants Figure 5.2a Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.8b

26 Bone Markings Surface features of bones Sites of attachments for muscles, tendons, and ligaments Passages for nerves and blood vessels Categories of bone markings Projections or processes grow out from the bone surface Terms often begin with T Depressions or cavities indentations Terms often begin with F Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.9

27

28 Title Microscopic Anatomy and Bone Growth Essential Question How do the microscopic structures of bone help in the process of bone growth and remodeling?

29 Microscopic Anatomy of Bone Osteon (Haversian System) A unit of bone containing central canal and matrix rings Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.10a

30 Microscopic Anatomy of Bone Central (Haversian) canal Opening in the center of an osteon Carries blood vessels and nerves Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.10a

31 Microscopic Anatomy of Bone Perforating (Volkman s) canal Canal perpendicular to the central canal Carries blood vessels and nerves Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.10a

32 Microscopic Anatomy of Bone Lacuna Cavities containing bone cells (osteocytes) Arranged in concentric rings Figure 5.3 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.11a

33 Osteon Lacuna (c) Central canal Interstitial lamellae Figure 5.4c

34 Microscopic Anatomy of Bone Lamella Rings around the central canal Sites of lacunae Figure 5.3 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.11a

35 Microscopic Anatomy of Bone Canaliculus Tiny canals Radiate from the central canal to lacunae Form a transport system Figure 5.3 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.11b

36 Types of Bone Cells Osteocytes Mature bone cells Osteoblasts Bone-forming cells Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.15

37 Types of Bone Cells Osteoclasts Bone-destroying cells Break down bone matrix for remodeling and release of calcium in response to parathyroid hormone Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.15

38 Formation of the Human Skeleton In embryos, the skeleton is primarily hyaline cartilage During development, much of this cartilage is replaced by bone Cartilage remains in isolated areas Bridge of the nose Parts of ribs Joints

39 Bone Growth (Ossification) Epiphyseal plates allow for lengthwise growth of long bones during childhood New cartilage is continuously formed Older cartilage becomes ossified Cartilage is broken down Enclosed cartilage is digested away, opening up a medullary cavity Bone replaces cartilage through the action of osteoblasts Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.13a

40 Bone Growth Bone Remodeling Bones are remodeled and lengthened until growth stops using both osteoblasts and osteoclasts Bones are remodeled in response to two factors Blood calcium levels When blood calcium levels decrease, PTH (parathyroid hormone), is released which causes bone to be broken down. When blood calcium levels increase, calcitonin is released which causes bone to be built. Pull of gravity and muscles on the skeleton will determine where bone matrix is to be remodeled Bones grow in width (appositional growth) Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.13b

41 Articular cartilage Hyaline cartilage Spongy bone New center of bone growth New bone forming Epiphyseal plate cartilage Growth in bone width Medullary cavity Bone starting to replace cartilage Growth in bone length New bone forming Bone collar Hyaline cartilage model In an embryo Invading blood vessels Epiphyseal plate cartilage In a fetus In a child Figure 5.5

42 Bone starting to replace cartilage Bone collar Hyaline cartilage model In an embryo Figure 5.5, step 1

43 Hyaline cartilage New center of bone growth Medullary cavity Invading Growth blood in bone vessels length In a fetus Figure 5.5, step 2

44 Articular cartilage Spongy bone New bone forming Epiphyseal plate cartilage Growth in bone width Invading blood vessels New bone forming Epiphyseal plate cartilage In a child Figure 5.5, step 3

45 Bone growth Bone grows in length because: 1 Cartilage grows here. 2 Cartilage is replaced by bone here. 3 Cartilage grows here. 4 Cartilage is replaced by bone here. Bone remodeling Growing shaft is remodeled as: Articular cartilage Epiphyseal plate 1 Bone is resorbed here. 2 Bone is added by appositional growth here. 3 Bone is resorbed here. Figure 5.6

46

47 Title Bone Fractures and Repair Essential Question What are the different types of bone fracture, and how does the body heal a fracture?

48 Bone Fractures Types of bone fractures Closed (simple) fracture break that does not penetrate the skin Open (compound) fracture broken bone penetrates through the skin Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.16

49 Common Types of Fractures Table 5.2 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.17

50 Bone Fractures Treatment reduction and immobilization Realignment of the bone Surgery is needed in some occasions Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.16

51 Repair of Bone Fractures 1. Hematoma (blood-filled swelling) is formed 2. Break is splinted by fibrocartilage to form a callus 3. Fibrocartilage callus is replaced by a bony callus 4. Bony callus is remodeled to form a permanent patch Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.18

52 Stages in the Healing of a Bone Fracture Figure 5.5 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.19

53 Analyzing X-Rays

54 Examining X-Rays Your team will be given an image of an x-ray and you will need to: Name all the bones on the x-ray Name the type of fracture (s) Provide a treatment plan Choose a team leader to speak for your group

55 INB pg 64 Title: X Ray Example Drawing of the x-ray Label ALL Bones Name the type of fracture(s) Write the treatment plan Date:

56 Case #1

57 My Expert Opinion Bones on X-ray: femur, tibia, fibula Type of Fracture: simple, impacted Treatment Plan: stabilize the bones and place cast on leg to immobilize the leg

58 Case #2

59 My Expert Opinion Bones on X-ray: femur and pelvis Type of Fracture: compound and comminuted Treatment Plan: stabilize the open wound, surgery to clean the wound, and stabilize bones with pins and screws

60 Case #3

61 My Expert Opinion Bones on x-ray: femur, tibia, fibula Type of Fracture: simple, spiral and greenstick Treatment: realign the bone and stabilize with a cast

62 Case #4

63 My Expert Opinion Bones on x-ray: skull and cervical vertebrate Type of Fracture: compression of the C5 Treatment: immobilize neck with brace

64 Case #5

65 My Expert Opinion Bones on x-ray: humerus, radius, ulna, and phalange Type of Fracture: greenstick of the distal ulna Treatment: realign the bone and stabilize with a cast

66 Case #6

67 My Expert Opinion Bones on x-ray: radius, ulna, carpel, metacarpal Type of Fracture: simple, impacted Treatment: realign the bone and stabilize with a cast

68 Case #7

69 My Expert Opinion Bones on x-ray: humerus, ulna, and radius Type of Fracture: simple, spiral Treatment: realign the bone and stabilize with a cast

70

71 Title Joints Essential Question Describe the structure and function of joints.

72 Joints Functions Hold bones together Allow for mobility Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.43

73 Functional Classification of Joints Synarthroses immovable Amphiarthroses slightly moveable Diarthroses freely moveable Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.44

74 Structural Classification of Joints Fibrous joints Cartilaginous joints Synovial joints Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.45

75 Fibrous Joints Bones united by collagenic fibers Types Sutures Immobile Example: Joints between skull bones Syndesmoses Allows more movement than sutures but still immobile Example: Distal end of tibia and fibula Gomphosis Immobile Example: Bind teeth to bony socket Figure 5.27d, e Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.46

76 Fibrous joints Fibrous connective tissue (a) Suture Figure 5.30a

77 Fibrous joints Tibia Fibula Fibrous connective tissue (b) Syndesmosis Figure 5.30b

78

79 Cartilaginous Joints Bones connected by cartilage Types Synchrondrosis Immobile Example: first sternocostal joint Symphysis Slightly movable Example: Pubic symphysis, intervertebral joints Figure 5.27b, c Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.47

80 Cartilaginous joints First rib Hyaline cartilage Sternum (c) Synchondrosis Figure 5.30c

81 Cartilaginous joints Vertebrae Fibrocartilage (d) Symphysis Figure 5.30d

82 Cartilaginous joints Pubis Fibrocartilage (e) Symphysis Figure 5.30e

83 Synovial Joints Articulating bones are separated by a joint cavity Synovial fluid is found in the joint cavity Articular cartilage (hyaline cartilage) covers the ends of bones Articular capsule encloses joint surfaces and lined with synovial membrane Joint cavity is filled with synovial fluid Reinforcing ligaments Example: Humerus with the ulna and radius Figure 5.27f h Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.48

84 Synovial joints Scapula Articular capsule Articular (hyaline) cartilage Humerus (f) Multiaxial joint (shoulder joint) Figure 5.30f

85 Synovial joints Humerus Articular (hyaline) cartilage Articular capsule Radius (g) Uniaxial joint (elbow joint) Ulna Figure 5.30g

86 Synovial joints Ulna Radius Carpals Articular capsule (h) Biaxial joint (intercarpal joints of hand) Figure 5.30h

87 The Synovial Joint Figure 5.28 Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.51

88 Types of Synovial Joints Based on Shape Figure 5.29a c Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.52a

89 Types of Synovial Joints Based on Shape Figure 5.29d f Copyright 2003 Pearson Education, Inc. publishing as Benjamin Cummings Slide 5.52b

90

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