Bones are made of OSSEOUS TISSUE
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1 SKELETAL SYSTEM
2 Functions of the Skeletal System Bones are made of OSSEOUS TISSUE Support and Protection Body movement Blood cell formation (bone marrow) Storage of inorganic materials (salt, calcium, potassium.)
3 ORGANIZATION About 206 bones 2 Main Divisions Axial & Appendicular
4 Axial Skeleton Head, neck, trunk Skull Hyoid Bone Vertebral Column Thoracic Cage (ribs, 12 pairs) Sternum
5 Hyoid Bone
6 Appendicular Skeleton Limbs & Bones that connect to the o Pectoral Girdle (shoulders) o Pelvic Girdle (hips)
7 BONE STRUCTURE - Long Bone 1.Epiphysis 2.Diaphysis 3.Articular Cartilage 4.Periosteum
8 Inside the Long Bone Medullary Cavity hollow chamber filled with bone marrow Red Marrow (blood) Yellow Marrow (fat) Endosteum lining of the medullary
9 Types of Bone Tissue Compact (wall of the diaphysis) Spongy (cancellous, epiphysis) * Assignment Coloring of a Long Bone *Stanley the Skeleton (next slide)
10
11 Microscopic Structure MATRIX - where the bone cells live OSTEOCYTES - mature bone cells, enclosed in tiny chambers called LACUNAE OSTEOCYTES form rings (LAMELLAE) around a HAVERSIAN CANAL which houses blood vessels Osteocytes are linked by CANALICULI Haversian Canals are linked by VOLKMAN's CANALS
12 Compact Bone BONE COLORING!
13 Structure of a Long Bone Figure 6.3a-c
14 BONE DEVELOPMENT & GROWTH 1.Intramembranous bones flat, skull 2. Endochondral bones all other ALL BONES START AS HYALINE CARTILAGE, areas graduallly turn to bone PRIMARY OSSIFICATION CENTER (shaft) SECONDARY OSSIFICATION CENTER (ends)
15 Bone Development & Growth EPIPHYSEAL DISK (growth plate) is a band of cartilage between the epiphysis and diaphysis These areas increase bone length as the cells ossify Cartilage becomes OSTEOBLASTS become OSTEOCYTES
16 RESORPTION OSTEOCLASTS - dissolve bone tissue to release minerals, process is called RESORPTION
17 Bone Growth
18 Bone Growth * Assignment - Coloring of the Aging Hand
19 Types of Joints (articulations) 1.Synarthrotic (not moveable, aka sutures) 2.Amphiarthrotic (slightly moveable, vertebrae) 3.Diarthrotic (moveable joint, aka synovial joints)
20 Synovial fluid - fluid within the joints that helps to lubricate Types of Joints 1. Ball and Socket 2. Hinge 3. Pivot 4. Saddle
21 BONES OF THE SKULL 1. Frontal - anterior portion above eyes 2. Parietal - one on each side of the skull, just behind frontal bone 3. Occipital - forms the back of the skull and base of the cranium 4. Temporal - forms parts of the sides and base of cranium 5. Sphenoid - wedged between several other bones in anterior portion of the cranium 6. Maxilla - forms upper jaws 7. Mandible - lower jaws, only moveable bone of the skull 8. Zygomatic Bone - cheekbone
22 TOPOGRAPHY OF THE SKULL Foramen - refers to any tiny opening, nerves and blood vessels leave this opening to supply the face Suture - refers to any connection between large bones (in fetal skulls, these are called fontanels) Fissure - any wide gap between bones
23 Sutures 1. Coronal - between frontal and parietal bones 2. Lambdoidal - between occipital and parietal bones 3. Squamosal - between temporal and parietal bones 4. Sagittal - between parietal bones
24 Bones of the Skull & Sutures
25 Foramen Magnum * Assignment: Skull Labeling
26
27 Figure 6.10
28 Figure 6.10
29
30 The Rest of the Bones
31 Thoracic Cage
32 Vertebrae Neck = cervical Middle Back = thoracic Lower Back = lumbar
33 Pectoral Girdle
34 Bones of the Arm Ulna goes to pinky (P-U) Radius goes to thumb
35 Wrist Bones For test Carpels Metacarpals Phalanges *extra credit opportunity
36 Pelvic Girdle
37 Bones of the Leg
38 Bones of the Ankle For Test Calcaneous Tarsals Metatarsals Phalanges Assignment Skeleton Labeling
39
40
41 Broken Bones
42 Upcoming Assignments The Skeleton Mystery - read about a crime scene and reconstruct skeletons to identify the remains Watch a Bones Episode Identify Bones on a real skeleton Lab Practical Test Medical Imaging learn how doctors view bones and diagnose problems
43 TEST INFORMATION Test will cover everything in your notes and on the slides presented in class Visit biologycorner.com for study aids A second test will occur that covers the lab portion
44 Abnormal Bone Conditions BONE SPURS: abnormal growth. Can occur on any bone (e.g. heel). OSTEOPOROSIS: Increased activity of osteoclasts cause a break down bone, and the subsequent fewer minerals in the extracellular matrix make it fragile. The spongy bone especially becomes more porous. Men get it as well as women. What s the best way to prevent osteoporosis? Exercise! What does exercise do? Makes bones bigger. The most common bone used for a bone graft is the iliac bone of the hip.
45 Osteoporosis Figure 6.15
46 ABNORMALITIES OF THE SPINE ABNORMALITIES OF THE SPINE SCOLIOSIS is a lateral curve in the spine KYPHOSIS is a hunchback curve LORDOSIS is a swayback in the lower region. ANKYLOSIS is severe arthritis in the spine and the vertebrae fuse.
47 SCOLIOSIS
48 LORDOSIS
49 ANKYLOSIS
50 FUN FACTS ABOUT BONES Bone is made of the same type of minerals as limestone. Babies are born with 300 bones, but by adulthood we have only 206 in our bodies. The giraffe has the same number of bones in its neck as a human: seven in total. The long horned ram can take a head butt at 25 mph. The human skull will fracture at 5mph.
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