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1 Chapter 9 Lecture Outline See PowerPoint Image Slides for all figures and tables pre-inserted into PowerPoint without notes. Copyright (c) The McGraw-Hill.

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Presentation on theme: "1 Chapter 9 Lecture Outline See PowerPoint Image Slides for all figures and tables pre-inserted into PowerPoint without notes. Copyright (c) The McGraw-Hill."— Presentation transcript:

1 1 Chapter 9 Lecture Outline See PowerPoint Image Slides for all figures and tables pre-inserted into PowerPoint without notes. Copyright (c) The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

2 2 Joints  Joints and their classification bony joints bony joints fibrous joints fibrous joints cartilaginous joints cartilaginous joints  Synovial joints

3 3 Joints and Their Classification  Arthrology = study of the joints  Kinesiology = study of musculoskeletal movement  Classified by freedom of movement diarthrosis (freely movable) diarthrosis (freely movable) amphiarthrosis (slightly movable) amphiarthrosis (slightly movable) synarthrosis (little or no movement) synarthrosis (little or no movement)  Classified how adjacent bones are joined fibrous, cartilaginous, bony or synovial fibrous, cartilaginous, bony or synovial

4 4 Bony Joint (Synostosis)  Gap between two bones ossifies frontal and mandibular bones in infants frontal and mandibular bones in infants cranial sutures in elderly cranial sutures in elderly attachment of first rib and sternum attachment of first rib and sternum  Can occur in either fibrous or cartilaginous joint

5 5 Fibrous Joints (Synarthrosis)  Collagen fibers span the space between bones sutures, gomphoses and syndesmoses sutures, gomphoses and syndesmoses

6 6  Immovable fibrous joints bind skull bones together bind skull bones together  Lap - overlapping beveled edges  Plane - straight, nonoverlapping edges palatine processes of the maxillae palatine processes of the maxillae Fibrous Joint -- Sutures

7 7 Types of Sutures

8 8 Fibrous Joint -- Gomphoses  Attachment of a tooth to its socket  Held in place by fibrous periodontal ligament collagen fibers attach tooth to jawbone collagen fibers attach tooth to jawbone  Some movement while chewing

9 9  Two bones bound by ligament only interosseus membrane interosseus membrane  Most movable of fibrous joints  Interosseus membranes unite radius to ulna and tibia to fibula Fibrous Joint -- Syndesmosis

10 10 Cartilaginous Joint -- Synchondrosis  Bones are joined by hyaline cartilage rib attachment to sternum rib attachment to sternum epiphyseal plate in children binds epiphysis and diaphysis epiphyseal plate in children binds epiphysis and diaphysis

11 11 Cartilaginous Joint -- Symphysis  2 bones joined by fibrocartilage pubic symphysis and intervertebral discs pubic symphysis and intervertebral discs  Only slight amount of movement is possible

12 12 Synovial Joint  Joint in which two bones are separated by a space called a joint cavity  Most are freely movable

13 13 General Anatomy  Articular capsule encloses joint cavity continuous with periosteum continuous with periosteum lined by synovial membrane lined by synovial membrane  Synovial fluid = slippery fluid; feeds cartilages  Articular cartilage = hyaline cartilage covering the joint surfaces  Articular discs and menisci jaw, wrist, sternoclavicular and knee joints jaw, wrist, sternoclavicular and knee joints absorbs shock, guides bone movements and distributes forces absorbs shock, guides bone movements and distributes forces  Tendon attaches muscle to bone  Ligament attaches bone to bone

14 14 Tendon Sheaths and Bursae  Bursa = saclike extension of joint capsule between nearby structures so slide more easily past each other  Tendon sheaths = cylinders of connective tissue lined with synovial membrane and wrapped around a tendon

15 15 Components of a Lever  A lever is a rigid object that rotates around a fixed point called a fulcrum  Rotation occurs when effort overcomes resistance resistance arm and effort arm are described relative to fulcrum resistance arm and effort arm are described relative to fulcrum

16 16 Mechanical Advantage of a Lever  Two kinds of levers lever that helps increase output of force lever that helps increase output of force human moving a heavy object with help of crowbarhuman moving a heavy object with help of crowbar lever move object further and faster lever move object further and faster movement of row boat with paddlemovement of row boat with paddle  Types of levers produce either increase in speed or force

17 17 First-Class Lever  Has fulcrum in the middle between effort and resistance  Atlantooccipital joint lies between the muscles on the back of the neck and the weight of the face loss of muscle tone occurs when you nod off in class

18 18 Second-Class Lever  Resistance between fulcrum and effort  Resistance from the muscle tone of the temporalis muscle lies between the jaw joint and the pull of the diagastric muscle on the chin as it opens the mouth quickly

19 19 Third-Class Lever  Effort between the resistance and the fulcrum most joints of the body  The effort applied by the biceps muscle is applied to the forearm between the elbow joint and the weight of the hand and the forearm

20 20 Range of Motion  Degrees through which a joint can move  Determined by structure of the articular surfaces structure of the articular surfaces strength and tautness of ligaments, tendons and capsule strength and tautness of ligaments, tendons and capsule stretching of ligaments increases range of motionstretching of ligaments increases range of motion double-jointed people have long or slack ligamentsdouble-jointed people have long or slack ligaments action of the muscles and tendons action of the muscles and tendons nervous system monitors joint position and muscle tonenervous system monitors joint position and muscle tone

21 21 Axes of Rotation  Shoulder joint has 3 degrees of freedom = multiaxial joint  Other joints – monoaxial or biaxial

22 22 Types of Synovial Joints

23 23 Ball-and-Socket Joints  Smooth hemispherical head fits within a cuplike depression head of humerus into glenoid cavity of scapula head of humerus into glenoid cavity of scapula head of femur into acetabulum of hip bone head of femur into acetabulum of hip bone  Multiaxial joint

24 24 Condyloid (ellipsoid) Joints  Oval convex surface on one bone fits into a similarly shaped depression on the next radiocarpal joint of the wrist radiocarpal joint of the wrist metacarpophalangeal joints at the bases of the fingers metacarpophalangeal joints at the bases of the fingers  Biaxial joints

25 25 Saddle Joints  Each articular surface is shaped like a saddle, concave in one direction and convex in the other trapeziometacarpal joint at the base of the thumb trapeziometacarpal joint at the base of the thumb  Biaxial joint more movable than a condyloid or hinge joint forming the primate opposable thumb more movable than a condyloid or hinge joint forming the primate opposable thumb

26 26 Gliding Joints  Flat articular surfaces in which bones slide over each other  Limited monoaxial joint  Considered amphiarthroses

27 27 Hinge Joints  One bone with convex surface that fits into a concave depression on other bone ulna and humerus at elbow joint ulna and humerus at elbow joint femur and tibia at knee joint femur and tibia at knee joint finger and toe joints finger and toe joints  Monoaxial joint

28 28 Pivot Joints  One bone has a projection that fits into a ringlike ligament of another  First bone rotates on its longitudinal axis relative to the other atlantoaxial joint (dens and atlas) atlantoaxial joint (dens and atlas) proximal radioulnar joint allows the radius during pronation and supination proximal radioulnar joint allows the radius during pronation and supination

29 29 Flexion, Extension and Hyperextension  Flexion decreases the angle of a joint  Extension straightens and returns to the anatomical position  Hyperextension = extension beyond 180 degrees

30 30 Flexion, Extension and Hyperextension

31 31 Abduction and Adduction  Abduction is movement of a part away from the midline hyperabduction – raise arm over back or front of head  Adduction is movement towards the midline hyperadduction – crossing fingers

32 32 Elevation and Depression  Elevation is a movement that raises a bone vertically mandibles are elevated during biting and clavicles during a shrug  Depression is lowering the mandible or the shoulders

33 33 Protraction and Retraction  Protraction = movement anteriorly on horizontal plane thrusting the jaw forward, shoulders or pelvis forward thrusting the jaw forward, shoulders or pelvis forward  Retraction is movement posteriorly

34 34 Circumduction  Movement in which one end of an appendage remains stationary while the other end makes a circular motion  Sequence of flexion, abduction, extension and adduction movements baseball player winding up for a pitch

35 35 Rotation  Movement on longitudinal axis rotation of trunk, thigh, head or arm rotation of trunk, thigh, head or arm  Medial rotation turns the bone inwards  Lateral rotation turns the bone outwards

36 36 Supination and Pronation  In the forearm and foot  Supination rotation of forearm so that the palm faces forward rotation of forearm so that the palm faces forward inversion and abduction of foot (raising the medial edge of the foot) inversion and abduction of foot (raising the medial edge of the foot)  Pronation rotation of forearm so the palm faces to the rear rotation of forearm so the palm faces to the rear eversion and abduction of foot (raising the lateral edge of the foot) eversion and abduction of foot (raising the lateral edge of the foot)

37 37 Movements of Head and Trunk  Flexion, hyperextension and lateral flexion of vertebral column

38 38 Rotation of Trunk and Head  Right rotation of trunk; rotation of head

39 39 Movements of Mandible  Lateral excursion = sideways movement  Medial excursion = movement back to the midline side-to-side grinding during chewing side-to-side grinding during chewing  Protraction – retraction of mandible

40 40 Movement of Hand and Digits  Radial and ulnar flexion  Abduction of fingers and thumb  Opposition is movement of the thumb to approach or touch the fingertips  Reposition is movement back to the anatomical position

41 41 Movements of the Foot  Dorsiflexion is raising of the toes as when you swing the foot forward to take a step (heel strike)  Plantarflexion is extension of the foot so that the toes point downward as in standing on tiptoe  Inversion is a movement in which the soles are turned medially  Eversion is a turning of the soles to face laterally

42 42 The Humeroscapular Joint  Most freely movable joint in the body shallowness and looseness shallowness and looseness deepened by glenoid labrum deepened by glenoid labrum  Supported by ligaments and tendons 3 glenohumeral, coracohumeral, transverse humeral and biceps tendon are important joint stabilizer 3 glenohumeral, coracohumeral, transverse humeral and biceps tendon are important joint stabilizer  Supported by rotator cuff musculature tendons fuse to joint capsule and strengthens it tendons fuse to joint capsule and strengthens it supraspinatus, infraspinatus, teres minor and subscapularis, supraspinatus, infraspinatus, teres minor and subscapularis,  4 Bursae associated with shoulder joint

43 43 Stabilizers of the Shoulder Joint

44 44 Tendons of Rotator Cuff Muscles

45 45 The Elbow Joint  Single joint capsule enclosing the humeroulnar and humeroradial joints  Humeroulnar joint is supported by collateral ligaments.  Radioulnar joint is head of radius held in place by the anular ligament encircling the head

46 46 Elbow Joint

47 47 The Coaxal (hip) Joint  Head of femur articulates with acetabulum  Socket deepened by acetabular labrum  Blood supply to head of femur found in ligament of the head of the femur Joint capsule strengthened by ligaments

48 48 Hip Joint  Joint capsule strengthened by ligaments pubofemoral pubofemoral ischiofemoral ischiofemoral iliofemoral iliofemoral

49 49 Dissection of Hip Joint

50 50 The Knee Joint  Most complex diarthrosis patellofemoral = gliding joint patellofemoral = gliding joint tibiofemoral = gliding with slight rotation and gliding possible in flexed position tibiofemoral = gliding with slight rotation and gliding possible in flexed position  Joint capsule anteriorly consists of patella and extensions of quadriceps femoris tendon  Capsule strengthened by extracapsular and intracapsular ligaments

51 51 Knee Joint – Sagittal Section

52 52 Knee Joint – Anterior and Posterior Views  Anterior and lateral cruciate ligaments limit anterior and posterior sliding movements  Medial and lateral collateral ligaments prevent rotation of extended knee

53 53 Knee Joint – Superior View  Medial and lateral meniscus absorb shock and shape joint

54 54 Dissection of Knee Joint

55 55 Arthritis  Arthritis is a broad term for pain and inflammation  Osteoarthritis results from years of joint wear articular cartilage softens and degenerates articular cartilage softens and degenerates accompanied by crackling sounds called crepitus accompanied by crackling sounds called crepitus bone spurs develop on exposed bone tissue causing pain bone spurs develop on exposed bone tissue causing pain

56 56 Arthritis and Artificial Joints  Rheumatoid arthritis is autoimmune attack on joint antibodies attack synovial membrane, enzymes in synovial fluid degrade the cartilage, bones ossify antibodies attack synovial membrane, enzymes in synovial fluid degrade the cartilage, bones ossify remissions occur, steroids and aspirin control inflammation remissions occur, steroids and aspirin control inflammation  Arthroplasty is replacement of diseased joint with artificial device called prosthesis

57 57 Rheumatoid Arthritis

58 58 Joint Prostheses


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