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SKELETAL SYSTEM. Functions of the Skeletal System. Bones are made of OSSEOUS TISSUE Support and Protection Body movement Blood cell formation (bone marrow) - hematopoeisis Storage of inorganic materials (salt, calcium, potassium….). ORGANIZATION. About 206 bones - PowerPoint PPT Presentation
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SKELETAL SYSTEM
Functions of the Skeletal System
•Bones are made of OSSEOUS TISSUE
•Support and Protection
•Body movement
•Blood cell formation (bone marrow) - hematopoeisis
•Storage of inorganic materials (salt, calcium, potassium….)
ORGANIZATION
•About 206 bones
•2 Main Divisions – Axial & Appendicular
Axial Skeleton
•Head, neck, trunk
•Skull
•Hyoid Bone
•Vertebral Column
•Thoracic Cage (ribs, 12 pairs)
•Sternum
Hyoid Bone
Appendicular Skeleton
•Limbs & Bones that connect to theoPectoral Girdle (shoulders)oPelvic Girdle (hips)
BONE STRUCTURE - Long Bone
1.Epiphysis2.Diaphysis3.Articular Cartilage4.Periosteum
Chondrocytes – cartilage cells
Inside the Long Bone
Medullary Cavity – hollow chamber filled with bone marrow-Red Marrow (blood)-Yellow Marrow (fat)Endosteum– lining of the medullary
Types of Bone Tissue
Compact (wall of the diaphysis)Spongy (cancellous, epiphysis) - red marrow
Structure of a Long Bone
Figure 6.3a-c
* Assignment – Coloring of a Long Bone
Review the Structure of a Long Bone
Matching quiz at http://www.mhhe.com/biosci/ap/holehaap/student/olc2/chap07matching01.html
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
Compact Bone
BONE COLORING!
Test Yourself
Find the...
Haversian CanalVolkman's Canal
Lamellae
Spongy BoneCompact Bone
BONE DEVELOPMENT & GROWTH
1.Intramembranous bones – flat, skull2. Endochondral bones – all other ALL BONES START AS HYALINE CARTILAGE, areas graduallly turn to bone PRIMARY OSSIFICATION CENTER (shaft) SECONDARY OSSIFICATION CENTER (ends)
Bone Development & GrowthEPIPHYSEAL 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
RESORPTION
OSTEOCLASTS - dissolve bone tissue to release minerals, process is called RESORPTION
Bone Growth
Bone Growth
* Assignment - Coloring of the Aging Hand
Bones of the Hand
Label the bones of the hand
Types of Joints (articulations)
1.Synarthrotic (not moveable, aka sutures)
2.Amphiarthrotic (slightly moveable, vertebrae)
3.Diarthrotic (moveable joint, aka synovial joints)
Synovial fluid - fluid within the joints that helps to lubricate
Types of Joints
1. Ball and Socket2. Hinge3. Pivot4. Saddle
BONES OF THE SKULL
1. Frontal -2. Parietal - 3. Occipital -4. Temporal - 5. Sphenoid - 6. Maxilla - 7. Mandible - 8. Zygomatic -
TOPOGRAPHY OF THE SKULL
Foramen - refers to any tiny opening, nerves and blood vessels leave this opening to supply the face
Mental Foramen
Suture - refers to any connection between large bones (in fetal skulls, these are called fontanels)
Fissure - any wide gap between bones
Sutures
1. Coronal - between frontal and parietal bones2. Lambdoidal - between occipital and parietal bones3. Squamosal - between temporal and parietal bones4. Sagittal - between parietal bones
Bones of the Skull & Sutures
Foramen Magnum
* Assignment: Skull Labeling
Figure 6.10
Figure 6.10
The Rest of the Bones
VertebraeNeck = cervical
Middle Back = thoracic
Lower Back = lumbar
Thoracic Cage
Pectoral Girdle
Bones of the Arm
Ulna goes to pinky (P-U)
Radius goes to thumb
Wrist Bones
Carpels
Metacarpals
Phalanges
Name the carpals for extra credit on test.
Pelvic Girdle
Bones of the Leg
Bones of the Ankle
Assignment – Skeleton Labeling
Calcaneous
Tarsals
Metatarsals
Phalanges
Broken Bones
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
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
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.
Osteoporosis
Figure 6.15
Rheumatoid arthritis is an autoimmune disease which causes joint stiffness and bone deformity
Source: http://www.thetimes.co.uk/tto/public/article3233439.ece
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.
SCOLIOSIS
LORDOSIS
ANKYLOSIS
FUN FACTS ABOUT BONESBone 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.