skeletal system bones and bone tissue. bone functions 1. support-framework 2. protection-skull,...
TRANSCRIPT
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SKELETAL SYSTEM
Bones and Bone Tissue
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Bone Functions
1. Support-framework 2. Protection-skull,
vertebrae, ribcage 3. Movement-levers for
muscles 4. Storage-Ca, other
minerals, fat 5. Blood cell formation-
marrow
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Bone Classification Bones are classified according to:
Shape Type of osseous tissue they contain
Types of osseous tissue Compact/dense bone Spongy/cancellous bone
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Bone Structure
Shape Flat Bones (sternum, ribs & most of skull)
Thin, flat, usually curved Spongy bone sandwiched between
2 layers of compact bone
Irregular Bones (vertebrae, facial & pelvic
bones Don’t fit into other categories-mostly spongy
bone with a thin layer of compact
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Bone Classification (continued) Shape
Long Bones (arms, legs, hands, feet)
mostly compact bones Short Bones (wrist, ankles)
Mostly spongy bone with thin
covering of compact bone
Sesamoid bones (patella)- specialized
short bones formed within a tendon
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Bone Structure Long Bones
Diaphysis Compact bone Medullary cavity Contains Yellow bone marrow
Epiphysis Ends of long bone Spongy (cancellous) bone with thin layer of compact Epiphyseal plate/line- place where bone gets longer
in children. Closes after puberty and become epiphyseal line in adults
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Bone structure(cont.) Periosteum- Membrane
Covering outside of bone Endosteum- surrounds
medullary cavity. Contains
osteoblasts and osteoclasts
Articular Cartilage- articulation=joint (place where two bones meet). Ends of bones in joints area covered with cartilage
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Bone Structure (continued)
Flat Bone “bone sandwich” Surface covered by
periosteum Internal cavities
lined with endosteum
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periosteum
endosteum
Spongy bone
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Markings on Bones Process--any bump or projection on a
bone Types of processes
Sites of muscle attachment Tuberosity-large rough process Trochanter- very large, rough process at the
femur Crest-prominent ridge (iliac crest)
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Markings on Bones continued
Types of processes(continued) Processes that help make joints
Head-end of epiphysis-with a neck(head of femur)
Condyle-rounded process at a joint(femur or humerus)
Depressions or openings Foramen-round passage for blood
vessels or nerves Sinus –cavity in bone, lined with
mucous membrane, filled with air
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Microscopic Bone Structure Basic unit of compact bone = Osteon
Lamellae (hard bony matrix) Haversian canal (central opening) Osteocytes(bone cells) are in lacunae
(pockets) Osteocytes connect by
canaliculi(little canals)
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Microscopic Bone Structure (continued)
Cancellous (spongy) bone—no osteons Matrix—network (trabeculae) form in
response to stress Woven around
blood vessels
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Bone Development Osteogenesis/Ossification= bone
formation and growth 2 types
Intramembranous ossification-bone forms from fibrous membrane. Less common. Found in flat bone and irregular bone
Endochondral ossification- bone forms from cartilage. Long and Short bones. Most bones form this way.
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Bone Growth Grow in length at epiphyseal plate
Bones stop growing longer at about Age 18 in women Age 21 in men
Bones grow in diameter by appositional growth New osteons form on outer
edge of bone (osteoblasts) Osteoclasts break down bone on the
inner edge
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Bone Growth
Hormones and bone growth Hormones control bone growth during childhood Growth hormone-from pituitary gland
Too much- giantism Too little - dwarfism
Thyroid hormones- work with growth hormone to keep growth at epiphyseal plate normal
Sex hormones at puberty lead to a growth spurt
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Stresses on Bones
Stress on bones creates a tiny electrical charge that attracts osteoblasts to the site of the stress
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Stresses on Bones Because of stresses on bones
Long bones are thickest in middle of shaft Curved bones thickest where they are most
likely to buckle Trabeculae of spongy bone form along
stress lines (for strength) Large processes grow where heavy, active
muscles attach(weightlifters) Unstressed bones shrink-ex: bedridden
paralyzed
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Fractures
Fracture=Broken bone 8 Types
1. Closed/simple-bone is broken but skin is intact
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Fractures
2. Open/compound- broken ends of the bone protrude through the skin. More serious injury. May lead to infection
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Fractures
3. Comminuted- many fragments. More common in the elderly
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Fractures 4. Compression- bone is
crushed. Common in osteoporosis Often in vertebrae
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Fractures
5. Depressed-broken part of bone is pressed in.
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Fractures
6. Impacted-broken bone ends are forced into one another Arms /wrists /shoulders- when one
tries to break a fall with one’s hands Legs/hips- with falls when a person
lands on their feet
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Fractures
7. Spiral- ragged break that happens when excessive twisting is involved
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Fractures
8. Greenstick- bone breaks incompletely (as a green twig) Occurs most often in children because
their bones are more flexible (not completely ossified)
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Fracture Repair Reduction= realignment of broken
bone ends Closed- no surgery, external manipulation Open- requires surgery. Bone ends are
brought together with pins, plates, wires
After reduction a cast or traction are used to immobilize the site
Healing for a simple fracture is 6-8 weeks- longer for larger bones or in elderly
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Fracture Repair
Repair steps Hematoma formation-causes damaged bone
cells to die. The area becomes swollen, reddened and painful
Cartilage callus forms-allows blood vessels to grow, phagocytes clean up dead cells. Fibroblasts and osteoblasts migrate to area to begin reconstruction
Bony callus forms- - spongy/cancellous bone Remodeling –takes months to complete.
Excess bone tissue is removed by osteoclasts
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Bone Disorders
Osteomalacia- soft bones. Bones are not adequately mineralized. Bones bend and deform causing a lot of pain Linked to Vit. D deficiency Rickets- Vit. D deficiency in
children- bow legs Head rib cage and pelvis often
deformed
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Bone Disorders Osteoporosis-bone mass decreases
More porous and lighter Compression of the spine are not uncommon Fractures at the neck of femur common (hip
fractures) Highest risk- women over 50 (after Menopause)
Estrogen deficiency Diet Decreased activity
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Bone Disorders Paget’s Disease- excessive and
abnormal bone formation and breakdown Bones get soft and thick leading to
increased deformities and irregular thickening
Seen in those over 40 Affects spine,femur,
pelvis and skull
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Bone Development
At birth most long bones are ossified By age 25 almost all bones are
completely ossified Bone formation vs. Bone breakdown Bone mass differences by race Preventing bone loss with age
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Axial Skeleton 206 bones in entire
skeleton Axial skeleton—80 bones
(skull, vertebral column, ribcage)
Axial skeleton functions1. Framework to protect &
support organs2. Attachments for muscles
that move head, neck, and torso
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Appendicular Skeleton
How many bones are there in the entire skeleton?
How many bones in the axial skeleton?
How many does that leave in the appendicular skeleton?
What is the appendicular skeleton?
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Parietal bone
Occipital bone
Frontal bone
Nasal bone
Maxilla
Mandible
Zygomatic bone
Sphenoid bone
Temporal boneMastoid process
Styloid Process
External Auditory Meatus
Occipital bone
Temporal bone
Foramen magnum
Occipital condyles
Styloid process
Zygomatic arch
Frontal bone
Supra-orbital ridge
Zygomatic bone
Maxilla
Mandible
Alveolar process
OrbitTemporal bone
Zygomatic boneMaxilla
Parietal bone
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Sinuses Hollow places in skull
Lined with mucous membrane Filled with air
Functions: 1. Make skull lighter 2. Lined with mucous membrane
Mucous functions: 1. warms, adds moisture to incoming air 2. traps particles so they are swallowed
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AtlasAxis
Cervical Vertebrae C1-7
Thoracic Vertebrae T1-12
Lumbar Vertebrae L1-5
Sacrum
Coccyx
True Ribs (1-7)
False Ribs (8-12)
Floating Ribs (11, 12)
Abnormal Spinal Curvatures
Scoliosis
Lordosis
Kyphosis
sternum
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Parietal Frontal
Occipital MaxillaMandible
Clavicle Scapula Sternum
Acromion Process
RibcageHumerus
Vertebral Column
Coxa IliumPubisIschium
RadiusSacrumUlna
CarpalsMetacarpals
Phalanges
Iliac Crest
Ischial tuberosity
Symphysis Pubis
Trochanter
Key:
Black = Axial Skeleton
Red = Pectoral Girdle
Blue = Pelvic Girdle
Femur
Patella
Tibia
Fibula
Talus TarsalsMetatarsals Phalanges
Coccyx
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Skeletal Development At 4 weeks after conception, limb buds
form At 5 weeks cartilage appears around
neural tube At 8 weeks ossification begins At birth—significant cartilage at both ends
of long bones and in the pelvis At birth—bones of skull are not fused
Fontanelles, sutures
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Individual Variations
Skeletal remains can often be identified because of variations among races and between sexes
There are racial differences in the skull and pelvis
Muscle development can be determined by bone mass and the size of processes
Age can be determined by epiphyseal plates (closed in adults)
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Skeletal Differences by Sex
Male Generally heavier,
rougher bones Sloping forehead Larger skull &
mandible Larger teeth Pelvis—narrow, heavy,
heartshaped, angle below symphysis < 90o
Female Lighter, smoother
bones More vertical forehead
Pelvis—broad, light, oval, angle below symphysis >100o
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ARTICULATIONS
Articulation= the point at which 2 bones meet
Articulation functions Hold bones together Allow movement
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TYPES OF ARTICULATIONS
1. Synarthroses Examples: sutures in skull, gomphosis
2. Amphiarthroses Examples: joints between ribs 2-10 and
sternum, symphysis 3. Diarthroses
Examples: joints of limbs
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DIARTHROSES
Synovial joints Articular capsule Synovial fluid
The more movable a joint is, the weaker and less stable it is.
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MOVEMENTS ALLOWED BY ARTICULATIONS Gliding Flexion/Extension
Dorsiflexion Plantar flexion Hyperextension
Abduction/Adduction Circumduction Rotation Supination/Pronation Inversion/Eversion Protraction/Retraction Elevation/Depression
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INJURIES/DISORDERS
Sprain-ligaments around joint are stretched or torn
Cartilage injuries-fall or twisting with high pressure
Dislocation- bones forced out of normal position in a joint
Arthritis Osteoarthritis Rheumatoid arthritis
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TYPES OF DIARTHROSES
Hinge-allows flexion and extension Pivot-allows rotation Saddle joint- allows broad range of
movement Ball and socket- allows broad range of
movement
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