The Skeletal System. Dr. Naim Kittana. Faculty of Medicine & Health Sciences An-Najah National University

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1 The Skeletal System Dr. Naim Kittana Faculty of Medicine & Health Sciences An-Najah National University 1

2 Declaration The content and the figures of this seminar were directly adopted from the text book Human Anatomy and Physiology / Ninth edition/ Eliane N. Marieb 2013 Dr. Naim Kittana, Dr. Suhaib Hattab 2

3 The Skeletal System Parts of the skeletal system: 1. Bones (skeleton) 2. Joints 3. Cartilages 4. Ligaments Divided into two divisions 1. Axial skeleton 2. Appendicular skeleton Dr. Naim Kittana, PhD 3

4 Functions of Bones Support of the body Protection of soft organs Movement due to attached skeletal muscles Storage of minerals and fats Blood cell formation Dr. Naim Kittana, PhD 4

5 Bones of the Human Body The skeleton has 206 bones Two basic types of bone tissue Compact bone Spongy bone Dr. Naim Kittana, PhD 5

6 Classification of Bones Dr. Naim Kittana, PhD 6

7 Structure of Flat Bones Dr. Naim Kittana, PhD 7

8 Structure of Long Bones Dr. Naim Kittana, PhD 8

9 Microscopic Anatomy of Compact Bone Five major cell types populate bone tissue: osteogenic cells, osteoblasts, osteocytes, bone lining cells, and osteoclasts Osteogenic cells (osteoprogenitor cells), are mitotically active stem cells found in the membranous periosteum and endosteum. When stimulated, these cells differentiate into osteoblasts or bone lining cells Osteoblasts are bone-forming cells that secrete the bone matrix. Osteocytes: The spidery osteocytes are mature bone cells that occupy spaces (lacunae) that conform to their shape. Osteocytes monitor and maintain the bone matrix. Dr. Naim Kittana, PhD 9

10 Microscopic Anatomy of Compact Bone Bone lining cells: are flat cells found on bone surfaces where bone remodeling is not going on. Like osteocytes, they are thought to help maintain the matrix. Osteoclasts: are giant multinucleate cells located at sites of bone resorption Dr. Naim Kittana, PhD 10

11 Microscopic Anatomy of Compact Bone Dr. Naim Kittana, PhD 11

12 Microscopic Anatomy of Compact Bone Osteon (Haversian System) The structural unit of compact bone. Each osteon is an elongated cylinder oriented parallel to the long axis of the bone. Functionally, osteons are tiny weight-bearing pillars. Dr. Naim Kittana, PhD 12

13 Microscopic Anatomy of Spongy Bone The trabeculae in spongy bone align precisely along lines of stress and help the bone resist stress. 13

14 Microscopic Anatomy of Compact Bone 14

15 Microscopic Anatomy of Compact Bone Dr. Naim Kittana, PhD 15

16 Bone Markings Dr. Naim Kittana, PhD 16

17 Bone Markings Dr. Naim Kittana, PhD 17

18 Upper surface of right tibia Capsule of hip-joint, Posterior aspect. Dr. Naim Kittana, PhD 18

19 Long Bone Formation and Growth 19

20 The Axial Skeleton Forms the longitudinal part of the body Divided into three parts 1. Skull 2. Vertebral column 3. Bony thorax Dr. Naim Kittana, PhD 20

21 The human skeleton 21

22 The Skull Two sets of bones 1. Cranium 2. Facial bones Bones are joined by sutures Only the mandible is attached by a freely movable joint Dr. Naim Kittana, PhD 22

23 The Skull: Anterior view 23

24 The Skull: Lateral View 24

25 The Skull: Superior View 25

26 The Skull: Inferior View 26

27 Paranasal Sinuses Hollow portions of bones surrounding the nasal cavity Dr. Naim Kittana, PhD 27

28 The Hyoid Bone The only bone that does not articulate with another bone Serves as a moveable base for the tongue Dr. Naim Kittana, PhD 28

29 The Vertebral Column Vertebrae separated by intervertebral discs The spine has a normal curvature Each vertebrae is given a name according to its location Dr. Naim Kittana, PhD 29

30 Structure of a Typical Vertebrae Dr. Naim Kittana, PhD 30

31 rib vertebrae joint Dr. Naim Kittana, PhD 31

32 Regional Characteristics of Vertebrae 32

33 Regional Characteristics of Vertebrae Dr. Naim Kittana, PhD 33

34 Regional Characteristics of Vertebrae 34

35 The Bony Thorax 35

36 The Appendicular Skeleton Limbs (appendages) Pectoral girdle Pelvic girdle Dr. Naim Kittana, PhD 36

37 The Pectoral (Shoulder) Girdle 37

38 The humerus of the right arm 38

39 Bones of the Upper Limb 39

40 Bones of the Upper Limb 40

41 Bones of the Pelvic Girdle Dr. Naim Kittana, PhD 41

42 Bones of the Pelvic Girdle 42

43 Gender Differences of the Pelvis 43

44 Gender Differences of the Pelvis 44

45 Bones of the Lower Limbs The thigh has one bone: femur thigh bone 45

46 Bones of the Lower Limbs The leg has two bones: Tibia Fibula The tibia and fibula of the right leg 46

47 Bones of the right foot The foot: 1. Tarsus ankle 2. Metatarsals sole 3. Phalanges toes Dr. Naim Kittana, PhD 47

48 Bones of the right foot 48

49 Arches of the Foot Together, the arches of the foot form a half dome that distributes about half of a person s standing and walking weight to the heel bones and half to the heads of the metatarsals. 49

50 Joints Articulations of bones Functions of joints: Hold bones together Allow for mobility Ways joints are classified: Functionally Structurally Dr. Naim Kittana, PhD 50

51 Classifications of Joints Functional Classification of Joints: 1. Immovable joints 2. Slightly moveable joints 3. Freely moveable joints Structural Classification of Joints: 1. Fibrous joints: Generally immovable 2. Cartilaginous joints: Immovable or slightly moveable 3. Synovial joints: Freely moveable Dr. Naim Kittana, PhD 51

52 Fibrous Joints 52

53 Cartilaginous Joints 53

54 Synovial Joints 54

55 The General Structure of Synovial Joint 55

56 Summary of joint classes Dr. Naim Kittana, PhD 56

57 Types of movements allowed by Synovial Joints Gliding occurs when one flat, or nearly flat, bone surface glides or slips over another (back-and-forth and side-to-side) Angular movements increase or decrease the angle between two bones. These movements may occur in any plane of the body and include flexion extension hyperextension abduction adduction circumduction Dr. Naim Kittana, PhD 57

58 Types of movements allowed by Synovial Joints Flexion: bending movement, usually along the sagittal plane, that decreases the angle of the joint and brings the articulating bones closer together Extension: is the reverse of flexion and occurs at the same joints Hyperextension: Continuing such movements beyond the anatomical position is called Dr. Naim Kittana, PhD 58

59 Types of movements allowed by Synovial Joints 59

60 Types of movements allowed by Synovial Joints 60

61 Types of movements allowed by Synovial Joints Abduction ( moving away ): is movement of a limb away from the midline or median plane of the body, along the frontal plane Adduction ( moving toward ): is the opposite of abduction, so it is the movement of a limb toward the body midline or, in the case of the digits, toward the midline of the hand or foot Circumduction: is moving a limb so that it describes a cone in space. The distal end of the limb moves in a circle, while the point of the cone (the shoulder or hip joint) is more or less stationary. Rotation: is the turning of a bone around its own long axis Dr. Naim Kittana, PhD 61

62 Types of movements allowed by Synovial Joints 62

63 Types of Synovial Joints Based on Shape 63

64 Synovial joints 1- Plane joints Permit gliding or sliding movements in the plane of the articular surfaces. The opposed surfaces of the bones are flat or almost flat, with movement limited by their tight joint capsules. Plane joints are numerous and are nearly always small. An example is the acromioclavicular joint between the acromion of the scapula and the clavicle. Dr. Naim Kittana, PhD 64

65 Synovial joints 2- Hinge joints Permit flexion and extension only Movements occur in one plane (sagittal) around a single axis that runs transverse uniaxial joints The joint capsule of these joints is thin and lax anteriorly and posteriorly where movement occurs The bones are joined by strong, laterally placed collateral ligaments. The elbow joint is a hinge joint Dr. Naim Kittana, PhD 65

66 Synovial joints 3- Pivot joints Permit rotation around a central axis; thus they are uniaxial. In these joints, a rounded process of bone rotates within a sleeve or ring. The median atlantoaxial joint is a pivot joint in which the atlas (C1 vertebra) rotates around a finger-like process, the dens of the axis (C2 vertebra), during rotation of the head. Dr. Naim Kittana, PhD 66

67 Pivot joints Dr. Naim Kittana, PhD 67

68 Types of Synovial Joints Based on Shape 68

69 Synovial joints 4- Condyloid joints Permit flexion and extension as well as abduction and adduction; thus condyloid joints are also biaxial Movement in one plane (sagittal) is usually greater (freer) than in the other. Circumduction, more restricted than that of saddle joints, is also possible The metacarpophalangeal joints (knuckle joints) are condyloid joints Dr. Naim Kittana, PhD 69

70 Types of Synovial Joints Based on Shape 70

71 5- Saddle joints Synovial joints Permit abduction and adduction as well as flexion and extension. Movements occurring around two axes at right angles to each other; thus saddle joints are biaxial joints that allow movement in two planes, sagittal and frontal. The performance of these movements in a circular sequence (circumduction) is also possible. The opposing articular surfaces are shaped like a saddle (i.e., they are reciprocally concave and convex). The carpometacarpal joint at the base of the 1st digit (thumb) is a saddle joint. Dr. Naim Kittana, PhD 71

72 Synovial joints 6- Ball and socket joints Allow movement in multiple axes and planes: Flexion and extension, abduction and adduction, medial and lateral rotation, and circumduction; thus ball and socket joints are multi-axial joints. In these highly mobile joints, the spheroidal surface of one bone moves within the socket of another. The hip joint is a ball and socket joint in which the spherical head of the femur rotates within the socket formed by the acetabulum of the hip bone. Dr. Naim Kittana, PhD 72

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