Skeletal System Joints, Relationship with other systems

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1 Skeletal System Joints, Relationship with other systems

2 Review the Types of Bones

3 Articulations Classification of Joints (Articulations) Joint Where two bones interact Three functional classes of joint Synarthroses Immovable Fibrous Amphiarthroses Examples of Joints Synarthroses Freely movable Synovial Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Amphiarthroses Slightly movable Cartilaginous Diarthroses Suture Gomphosis Synchondrosis Syndesmosis Symphysis Diarthroses Synovial joints

4

5 Articulations Synovial Joint Synovial Joints (Diarthroses) Epiphyses covered by articular cartilage Lubricated by synovial fluid Enclosed within joint capsule Other synovial structures include: Menisci Bursae Fat pads Ligaments Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

6 Structure of Synovial Joints

7 Structure of Synovial Joints

8 Types of Movements Synovial Joints: Movements Flexion Extension Hyperextension Abduction Adduction Circumduction Rotation Pronation, supination

9 Angular Movements

10 Angular Movements

11 Angular Movements

12 Angular Movements Figure 6-32(d)

13 Rotational Movements

14 Rotational Movements

15 Special Movements Head Foot and ankle Protraction, retraction Depression, elevation (jaw) Inversion, eversion Dorsiflexion, plantar flexion Hand Opposition of thumb, palm Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

16 Structural Classification of Synovial Joints Gliding (e.g., vertebra vertebra) Hinge (e.g., knee) Pivot (e.g., atlas axis) Ellipsoidal (e.g., distal radius) Saddle (e.g., thumb) Ball-and-Socket (e.g., hip)

17 Articulations Structural Classification of Synovial Joints Figure 6-35(a)

18 Articulations Structural Classification of Synovial Joints Figure 6-35(b)

19 Articulations Structural Classification of Synovial Joints Figure 6-35(c)

20 Articulations Structural Classification of Synovial Joints Figure 6-35(d)

21 Articulations Structural Classification of Synovial Joints Figure 6-35(e)

22 Articulations Structural Classification of Synovial Joints PLA Y A Functional Classification of Synovial Joints Figure 6-35(f)

23 Articulations Key Note A joint cannot be both highly mobile and very strong. The greater the mobility, the weaker the joint, because mobile joints rely on support from muscles and ligaments rather than solid bone-to-bone connections. Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

24 Articulations Intervertebral Articulations Two kinds join adjacent vertebrae Gliding joints Between superior and inferior articular processes Permit small movements Symphyseal joints Intervertebral discs composed of fibrocartilage Cushion and connect Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

25 Articulations Intervertebral Articulations Figure 6-36

26 Articulations The Shoulder Joint Ball-and-socket design frees movement Humerus head mates with glenoid cavity Joint capsule extends from scapular neck to humerus Joint dislocates easily Bursae reduce friction Bursitis restricts motion, causes pain Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

27 Articulations The Shoulder Joint PLA Y Humerus Rotation Figure 6-37

28 Articulations The Elbow Joint Two articulations Humerus radius Humerus ulna Interlocking hinge design Limited movement Flexion and extension only Strong ligaments Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

29 Articulations PLA Y The Elbow Joint Elbow Flexion/Extension Figure 6-38

30 Articulations The Hip Joint Acetabulum and head of femur Extremely strong, stable joint Many strong ligaments Tough joint capsule Bulky muscles Versatile movements Flexion, extension, adduction, abduction, circumduction, rotation Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

31 Articulations The Hip Joint Figure 6-39

32 Articulations The Knee Joint Complex hinge joint Three separate articulations Fibrocartilage pads Femur-tibia (between condyles lateral and medial) Femur-patella Medial and lateral menisci Ligaments Cruciate ligaments inside joint Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings

33 Articulations The Knee Joint Figure 6-40

34 Review the Joints

35 Review the Joints

36 The Skeletal System in Perspective FIGURE 6-41 Functional Relationships Between the Skeletal System and Other Systems Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

37 The Integumentary System Synthesizes vitamin D3, essential for calcium and phosphorus absorption (bone maintenance and growth) Provides structural support Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

38 The Muscular System Stabilizes bone positions; tension in tendons stimulates bone growth and maintenance Provides calcium needed for normal muscle contraction; bones act as levers to produce body movements Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

39 The Nervous System Regulates bone position by controlling muscle contractions Provides calcium for neural function; protects brain, spinal cord; receptors at joints provide information about body position Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

40 The Endocrine System Skeletal growth regulated by growth hormone, thyroid hormones, and sex hormones; calcium mobilization regulated by parathyroid hormone and calcitonin Protects endocrine organs, especially in brain, chest, and pelvic cavity Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

41 The Cardiovascular System Provides oxygen, nutrients, hormones, blood cells; removes waste products and carbon dioxide Provides calcium needed for cardiac muscle contraction, blood cells produced in bone marrow Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

42 The Lymphatic System Lymphocytes assist in the defense and repair of bone following injuries Lymphocytes and other cells of the immune response are produced and stored in bone marrow Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

43 The Respiratory System Provides oxygen and eliminates carbon dioxide Movements of ribs important in breathing; axial skeleton surrounds and protects lungs Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

44 The Digestive System Provides nutrients, calcium, and phosphate Ribs protect portions of liver, stomach, and intestines Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

45 The Urinary System Conserves calcium and phosphate needed for bone growth; disposes of waste products Axial skeleton provides some protection for kidneys and ureters; pelvis protects urinary bladder and proximal urethra Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

46 The Reproductive System Sex hormones stimulate growth and maintenance of bones; surge of sex hormones at puberty causes acceleration of growth and closure of epiphyseal cartilages Pelvis protects reproductive organs of female, protects portion of ductus deferens and accessory glands in males Copyright 2007 Pearson Education, Inc., publishing as Benjamin Cummings Figure of 11

Chapter 9 Articulations Articulations joints where two bones interconnect. Two classification methods are used to categorize joints:

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