The Appendicular Skeleton

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1 8 The Appendicular Skeleton PowerPoint Lecture Presentations prepared by Jason LaPres Lone Star College North Harris

2 8-1 The Pectoral Girdle The Pectoral Girdle Also called shoulder girdle Connects the arms to the body Consists of: Two clavicles Two scapulae Connects with the axial skeleton only at the manubrium

3 8-1 The Pectoral Girdle The Clavicles Also called collarbones Long, S-shaped bones Originate at the manubrium (sternal end) Articulate with the scapulae (acromial end)

4 Figure 8-2a The Right Clavicle Scapula Clavicle Jugular notch The position of the clavicle within the pectoral girdle, anterior view.

5 Figure 8-2b The Right Clavicle Acromial end Sternal end LATERAL MEDIAL Facet for articulation with acromion Superior view of the right clavicle.

6 8-1 The Pectoral Girdle The Scapulae Also called shoulder blades Broad, flat triangles Articulate with arm and collarbone

7 8-1 The Pectoral Girdle The Scapulae The scapular head Holds glenoid cavity Which articulates with humerus To form shoulder joint (glenohumeral joint)

8 8-1 The Pectoral Girdle The Scapulae Acromion Posterior, larger Articulates with clavicle At the acromioclavicular joint

9 Figure 8-3a The Right Scapula Acromion Coracoid process Superior border Superior angle Lateral angle Subscapular fossa Body Lateral border Medial border Inferior angle Anterior view

10 Figure 8-3b The Right Scapula Supraglenoid tubercle Acromion Coracoid process Spine Glenoid cavity Lateral border Inferior angle Lateral view

11 Figure 8-3c The Right Scapula Supraspinous fossa Coracoid process Acromion Superior border Neck Spine Body Infraspinous fossa Medial border Inferior angle Lateral border Posterior view

12 8-2 The Upper Limbs The Upper Limbs Consist of: The arms, forearms, wrists, and hands Note: arm (brachium) = 1 bone, the humerus

13 8-2 The Upper Limbs The Humerus Also called the arm The long, upper arm bone Articulates with the pelvic girdle

14 8-2 The Upper Limbs The Humerus Head Rounded, articulating surface Contained within joint capsule

15 8-2 The Upper Limbs The Humerus The distal epiphysis Medial and lateral epicondyles For muscle attachment Condyle of the humerus Articulates with ulna and radius

16 8-2 The Upper Limbs The Humerus Articular regions of the condyle Trochlea Articulates with ulna Capitulum Radial fossa Articulates with radius

17 Figure 8-4a The Right Humerus and Elbow Joint Greater tubercle Head Lesser tubercle Intertubercular groove Anatomical neck Surgical neck Deltoid tuberosity Shaft Radial fossa Lateral epicondyle Coronoid fossa Medial epicondyle Capitulum Trochlea Condyle Anterior surface

18 Figure 8-4c The Right Humerus and Elbow Joint Humerus Medial epicondyle Head of radius Trochlea Capitulum Coronoid process of ulna Radial notch of ulna Elbow joint, anterior view

19 Figure 8-4b The Right Humerus and Elbow Joint Head Greater tubercle Anatomical neck Surgical neck Deltoid tuberosity Radial groove Olecranon fossa Medial epicondyle Lateral epicondyle Trochlea Posterior surface

20 Figure 8-4d The Right Humerus and Elbow Joint Humerus Medial epicondyle Olecranon fossa Olecranon Trochlea of humerus Head of radius Ulna Elbow joint, posterior view

21 8-2 The Upper Limbs The Forearm Also called the antebrachium Consists of two long bones 1. Ulna (medial) 2. Radius (lateral)

22 8-2 The Upper Limbs The Ulna The olecranon Superior end of ulna Point of elbow Superior lip of trochlear notch Articulates with trochlea of humerus

23 8-2 The Upper Limbs The Ulna Other articulations Radial notch Articulates with head of radius Forms proximal radio-ulnar joint

24 Figure 8-5a The Right Radius and Ulna Olecranon Proximal radioulnar joint Radial head Neck of radius ULNA RADIUS Interosseous membrane Ulnar head Styloid process of ulna Posterior view Ulnar notch of radius Styloid process of radius

25 Figure 8-5b The Right Radius and Ulna Radial head Neck of radius Radial tuberosity Trochlear notch Coronoid process Radial notch Ulnar tuberosity RADIUS ULNA Interosseous membrane Distal radio-ulnar joint Styloid process of radius Ulnar head Anterior view

26 8-2 The Upper Limbs The Ulna Interosseous membrane A fibrous sheet Connects lateral margin of ulnar shaft to radius

27 8-2 The Upper Limbs The Radius Lateral bone of forearm

28 Figure 8-5a The Right Radius and Ulna Olecranon Proximal radioulnar joint Radial head Neck of radius ULNA RADIUS Interosseous membrane Ulnar head Styloid process of ulna Posterior view Ulnar notch of radius Styloid process of radius

29 Figure 8-5b The Right Radius and Ulna Radial head Neck of radius Radial tuberosity Trochlear notch Coronoid process Radial notch Ulnar tuberosity RADIUS ULNA Interosseous membrane Distal radio-ulnar joint Styloid process of radius Ulnar head Anterior view

30 Figure 8-5c The Right Radius and Ulna Olecranon Trochlear notch Coronoid process Radial notch Ulnar tuberosity ULNA Lateral view of ulna, showing trochlear notch

31 8-2 The Upper Limbs Eight Carpal Bones Four proximal carpal bones Four distal carpal bones Allow wrist to bend and twist

32 Figure 8-6 Bones of the Right Wrist and Hand RADIUS Lunate ULNA RADIUS Lunate Scaphold Trapezium Trapezoid Triquetrum Pisiform Scaphold Trapezium Trapezoid Capitate Metacarpal bones Proximal phalanx I II III IV V Hamate V IV III II I Capitate Metacarpal bones Distal phalanx Proximal phalanx Middle phalanx Distal phalanx Anterior view Posterior view

33 8-2 The Upper Limbs Metacarpal Bones The five long bones of the hand Numbered I V from lateral (thumb) to medial Articulate with proximal phalanges Phalanges of the Hands 14 total finger bones thumb Two phalanges (proximal, distal) Fingers Three phalanges (proximal, middle, distal)

34 Figure 8-6a Bones of the Right Wrist and Hand RADIUS Lunate ULNA Scaphold Triquetrum Trapezium Trapezoid Pisiform Capitate Metacarpal bones I II III IV V Hamate Proximal phalanx Distal phalanx Anterior view

35 Figure 8-6b Bones of the Right Wrist and Hand ULNA RADIUS Lunate Triquetrum Pisiform Scaphold Trapezium Trapezoid Hamate I Capitate V IV III II Metacarpal bones Proximal phalanx Middle phalanx Distal phalanx Posterior view

36 8-3 The Pelvic Girdle The Pelvic Girdle Made up of two hip bones (coxal bones) Strong to bear body weight, stress of movement Made up of three fused bones 1. Ilium (articulates with sacrum) 2. Ischium 3. Pubis

37 8-3 The Pelvic Girdle Coxal Bones The acetabulum Also called the hip socket Is the meeting point of the ilium, ischium, and pubis Is on the lateral surface of the hip bone (coxal bone) Articulates with head of the femur (lunate surface) Acetabular notch A gap in the ridge of the margins of the acetabulum

38 Figure 8-7a The Right Hip Bone Ilium POSTERIOR ANTERIOR Ischium Pubis Anterior gluteal line Posterior gluteal line Iliac crest Anterior superior iliac spine Posterior superior iliac spine Posterior inferior iliac spine Greater sciatic notch Lunate surface of acetabulum Ischial spine Lesser sciatic notch Inferior gluteal line Anterior inferior iliac spine Acetabulum Acetabular notch Superior ramus of pubis Pubic tubercle Inferior ramus of pubis Ischial tuberosity Obturator foramen Ischial ramus Right hip bone, lateral view

39 8-3 The Pelvic Girdle Marks of the Pubis Pubic symphysis Gap between pubic tubercles Padded with fibrocartilage Obturator foramen Formed by ischial and pubic rami Attaches hip muscles Siatic notch

40 Figure 8-7a The Right Hip Bone Ilium POSTERIOR ANTERIOR Ischium Pubis Anterior gluteal line Posterior gluteal line Iliac crest Anterior superior iliac spine Posterior superior iliac spine Posterior inferior iliac spine Greater sciatic notch Lunate surface of acetabulum Ischial spine Lesser sciatic notch Inferior gluteal line Anterior inferior iliac spine Acetabulum Acetabular notch Superior ramus of pubis Pubic tubercle Inferior ramus of pubis Ischial tuberosity Obturator foramen Ischial ramus Right hip bone, lateral view

41 Figure 8-7b The Right Hip Bone Ilium ANTERIOR Pubis POSTERIOR Ischium Iliac crest Anterior superior iliac spine Iliac fossa Auricular surface for articulation with sacrum Iliac tuberosity Anterior inferior iliac spine Pubic tubercle Pectineal line Location of pubic symphysis Posterior superior iliac spine Posterior inferior iliac spine Greater sciatic notch Arcuate line Ischial spine Lesser sciatic notch Ischial tuberosity Ischial ramus Right hip bone, medial view

42 8-3 The Pelvic Girdle Coxal Bones Articulations of the pelvic girdle Sacroiliac joint The Pelvis Articulation of posterior auricular surface of ilium With the sacrum Stabilized by ligaments of iliac tuberosity Consists of two coxal bones, the sacrum, and the coccyx Stabilized by ligaments of pelvic girdle, sacrum, and lumbar vertebrae

43 Figure 8-8a The Pelvis of an Adult Male SACRUM COCCYX ILIUM PUBIS ISCHIUM Hip bone (Figure 8 7) Iliac crest L 5 Arcuate line Sacroiliac joint SACRUM Iliac fossa ILIUM Acetabulum PUBIS Pubic tubercle Obturator foramen Anterior view Pubic symphysis ISCHIUM

44 Figure 8-8b The Pelvis of an Adult Male SACRUM COCCYX ILIUM PUBIS ISCHIUM Hip bone (Figure 8 7) Iliac crest L 5 Sacral foramina Posterior superior iliac spine Posterior inferior iliac spine SACRUM Greater sciatic notch Ischial spine COCCYX Posterior view Ischial tuberosity

45 8-3 The Pelvic Girdle Comparing the Male Pelvis and Female Pelvis Female pelvis Smoother and lighter Less prominent muscle and ligament attachments Pelvis modifications for childbearing Enlarged pelvic outlet Broad pubic angle (>100 ) Less curvature of sacrum and coccyx Wide, circular pelvic inlet Broad, low pelvis Ilia project laterally, not upwards

46 Figure 8-10 Anatomical Differences between a Male and Female Pelvis Ischial spine Ischial spine 90 or less Male 100 or more Female

47 Figure 8-10a Anatomical Differences between a Male and Female Pelvis Ischial spine 90 or less Male

48 Figure 8-10b Anatomical Differences between a Male and Female Pelvis Ischial spine 100 or more Female

49 8-4 The Lower Limbs Functions of the Lower Limbs Weight bearing Motion Note: leg = lower leg; thigh = upper leg

50 8-4 The Lower Limbs Bones of the Lower Limbs Femur (thigh) Patella (kneecap) Tibia and fibula (leg) Tarsals (ankle) Metatarsals (foot) Phalanges (toes)

51 8-4 The Lower Limbs The Femur The proximal epiphysis Femoral head Articulates with pelvis at acetabulum The neck Narrow area between head and trochanters Joins shaft at angle

52 8-4 The Lower Limbs The Femur The distal epiphysis Medial epicondyle and lateral epicondyle Above the knee joint Medial condyle and lateral condyle Separated by intercondylar fossa and patellar surface Form part of knee joint

53 Figure 8-11 Bone Markings on the Right Femur Neck Greater trochanter Fovea capitis Femoral head Intertrochanteric line Lesser trochanter Neck Greater trochanter Intertrochanteric crest Gluteal tuberosity Pectineal line Patellar surface Lateral epicondyle Lateral condyle Shaft Medial supracondylar ridge Adductor tubercle Medial epicondyle Medial condyle Linea aspera Lateral supracondylar ridge Popliteal surface Intercondylar fossa Lateral epicondyle Lateral condyle Anterior surface Posterior surface

54 8-4 The Lower Limbs The Patella Also called the kneecap A sesamoid bone Formed within tendon of quadriceps femoris Base attaches quadriceps femoris Apex attaches patellar ligament

55 Figure 8-12a The Right Patella (a, b) and Patella with Femur (c) Attachment area for quadriceps tendon Base of patella Attachment area for patellar ligament Apex of patella Anterior view

56 Figure 8-12b The Right Patella (a, b) and Patella with Femur (c) Lateral facet, for lateral condyle of femur Medial facet, for medial condyle of femur Articular surface of patella Posterior view

57 Figure 8-12c The Right Patella (a, b) and Patella with Femur (c) Lateral facet, for lateral condyle of femur Patella Medial facet, for medial condyle of femur Articular surface of patella Lateral condyle of femur Medial condyle of femur Inferior view of right femur and patella

58 8-4 The Lower Limbs The Tibia Also called the shinbone Supports body weight Larger than fibula Medial to fibula

59 8-4 The Lower Limbs The Tibia The proximal epiphysis Medial and lateral tibial condyles Separated by intercondylar eminence Articulate with medial and lateral condyles of femur

60 8-4 The Lower Limbs The Tibia The distal epiphysis Medial malleolus Medial projection at the ankle

61 8-4 The Lower Limbs The Fibula Attaches muscles of feet and toes Smaller than tibia Lateral to tibia

62 8-4 The Lower Limbs The Fibula Articulations with tibia Fibula/tibia articulations Head Inferior tibiofibular joint Interosseous membrane Binds fibula to tibia Lateral malleolus Lateral projection of ankle

63 Figure 8-13a The Right Tibia and Fibula Lateral tibial condyle Head of fibula Superior tibiofibular joint Medial tibial condyle Tibial tuberosity Interosseous membrane Anterior margin TIBIA FIBULA Lateral malleolus (fibula) Anterior view Medial malleolus (tibia) Inferior articular surface

64 Figure 8-13b The Right Tibia and Fibula Articular surface of medial tibial condyle Medial tibial condyle Soleal line Intercondylar eminence Articular surface of lateral tibial condyle Lateral tibial condyle Head of fibula Interosseous membrane TIBIA FIBULA Medial malleolus (tibia) Inferior tibiofibular joint Lateral malleolus (fibula) Posterior view

65 Figure 8-13c The Right Tibia and Fibula Anterior margin Tibia Fibula Interosseous membrane Cross section of tibia and fibula

66 8-4 The Lower Limbs The Ankle Also called the tarsus Consists of seven tarsal bones Bones of the ankle Talus Carries weight from tibia across trochlea Calcaneus (heel bone) Transfers weight from talus to ground Attaches calcaneal (Achilles) tendon

67 Figure 8-14a Bones of the Ankle and Foot Calcaneus Trochlea of talus Talus Cuboid Navicular Cuneiform bones Lateral V IV III II I Intermediate Medial Phalanges Proximal Metatarsal bones Middle Distal Hallux Proximal phalanx Distal phalanx Superior view, right foot

68 8-4 The Lower Limbs Metatarsal Bones of the Foot Five long bones of foot Numbered I V, medial to lateral Articulate with toes

69 8-4 The Lower Limbs Phalanges of the Foot Phalanges 14 bones of the toes Hallux Big toe or great toe, two phalanges (distal, proximal) Other four toes Three phalanges (distal, medial, proximal)

70 Figure 8-14a Bones of the Ankle and Foot Calcaneus Trochlea of talus Talus Cuboid Navicular Cuneiform bones Lateral V IV III II I Intermediate Medial Phalanges Proximal Metatarsal bones Middle Distal Hallux Proximal phalanx Distal phalanx Superior view, right foot

71 Figure 8 14b Bones of the Ankle and Foot Phalanges Metatarsal bones Medial cuneiform bone Navicular Talus Calcaneus Transverse arch Longitudinal arch Medial view, right foot

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