The Skeleton 206 bones - FisiokinesiterapiaFacial bones Maxillae: upper jaw, 2 bones fused medially...
Transcript of The Skeleton 206 bones - FisiokinesiterapiaFacial bones Maxillae: upper jaw, 2 bones fused medially...
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The Skeleton206 bones
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What makes up the skeleton?
• Cartilage• Bone
– In embryos the skeleton is mainly hyaline cartilage that eventually is replaced by bone, in adults
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Function of the skeletal system
• Support• Protect• Lipid & mineral storage• Site for blood cell formation ( in marrow
cavities)
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2 divisions of the skeletal system:
1. Axial• Skull, vertebral column,
thorax, sternum
2. Appendicular• Pelvis, upper & lower
extremities, scapula, clavicles
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Bone Markings
• Projections/Processes– Sites for muscle attachment/formation of joints
• Depressions/cavities– Passageway for Nerves/Blood Vessels
* Pg 51 table 7.1
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Classification of bone according to texture:
• Compact– Dense, smooth
• Spongy– Made up of
trabeculae…lots of open space
* Pg 52 fig 7.2
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Classification of bone continued…
• Long• Short• Flat• Irregular
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Long Bones
–Longer than they are wide, has shaft w/ head on each end, mostly compact Ex: femur
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Short Bones
–Cube shaped, more spongy bone ex: tarsals
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Flat Bones
Very thin, spongy bone sandwiched between compact bone ex: skull
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Irregular Bones
–Anything else ex: vertebrae
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Parts of the Long Bone/ pg. 52
• Diaphysis: smooth shaft, compact bone
• Periostium: fibrous membrane covers surface
• Epiphysis: end of bone, compact Bone enclosing spongy Bone
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Long bones
• Articular cartilage: made up of hyaline cartilage to prevent friction of joints: replaces periostium at epiphysis
• Ephiphyseal plate: growth plate, hyaline cartilage that is replace by bone….epiphyseal lines
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Long bones
• Medullary cavity: central canal• Yellow marrow: fatty tissue found in
meduallry cavity• Red marrow: forms RBC’s in infant and is
found in medullary cavity…in adults red marrow is in the interior epiphyses
• Endosteum: lines the medullary cavity
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Bone under the microscope
• Centeral/Haversion Canal: verticle• Lacunae: chambers• Osteocytes: mature bone cells• Lamellae: circular arrangement • Osteon/Haversion system: central canal & all
lamellae surrounding it• Caniliculi: tiny canals running from central canal
to lacunae of first lamellae than lam. to lam.• Perforating/Volkman’s Canals: horozontal
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The Axial Skeleton
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The Skull
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Frontal bone
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Parietal Bone
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Sphenoid Bone• Greater wings • Lesser wings• Foramen ovale: CNV• Sella turcica
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Temporal Bone
• Zygomatic process• Mastoid process• EAM• Styloid process• Jugular foramen
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Occipital Bone
• Foramen Magnum
• Occipital condyle
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Ethmoid bone
• Crista gali• Cribiform
plates
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Facial bones
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Facial bones
Maxillae: upper jaw, 2 bones fused medially all bones join it, except mandible
*palatine process: anterior hard palateLacrimal bones: forming medial orbit, w/ opening
for tears, between ethmoid & maxillaNasal bones: small, rectangular, form bridge of
nosePalantine bones: posterior to palantine process,
form posterior hard palate and part of orbit
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Maxillae
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Lacrimal bones
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Palantine Bones
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Facial bones
Mandible: single bone, lower jaw, only freely movable joint of skull (w/ temporal)ramus: verticle extensions of bodybody: chinalveolar margin: superior margin, contains teeth sockets
Zygomatic bones: cheek bones/lateral orbitVomer: single bone, forms nasal septum, blade
shaped in median plane
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Mandible
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Zygomatic bones
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Vomer
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Vertebral Column
24 single & 2 fused bones
5 parts:1. Cervical: 72. Thoracic:123. Lumbar: 54. Sacral: 5 fused5. Coccyx: 3-5 fused
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Common features on Vertebrae
• Spinous process: posterior spike• Body: faces anterior• Vertebral foramen: spinal cord
passageway• Transverse process: project laterally off
body• Transverse foramen: only in cervical,
passageway for vertebral arteries
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Vertebrae
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Cervical
• 7• Smallest• Bifid SP’s• Transverse foramens: vertebral arteries• V. Foramen triangular• Atlas(C1) no body AO joint ; flex/extnsion• Axis(C2) odontoid process/den; rotation• C7: not bifid, vertebral prominens
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Cervical X-ray
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Atlas & Axis
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Thoracic xray
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Thoracic Vertebrae
• 12• Medium• Heart shaped body• costal demifacets• Vertebral foramen round• Sp’s long w/ inferior angle
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Lumbar Vertebrae5
• Largest• Sp’s:Short thickpoint posterior
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Sacrum
• 5 fused vertebrae• Median sacral crest: sp’ REMNANTS• Ala: wings• Sacral canal: A CONTINUATION OF THE
VERTEBRAL CANAL
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Coccyx
• 3-5 fused• tailbone
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Intervertebral Discs (IVD)
• Shock absorber fibrocartilge pads between vertebrae
• Gel like center Nucleus pulposis
• Outer rings of collagen fibers known as annulus fibrosis
• Give us height
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Ribs
12 pair articulate the vertebral column posterior an first 7 articulate anterior w/ sternum
• True ribs: first 7 attach to sternum by their costal cartilage
• False ribs: 8-12..8- 10 indirect c.c. attachment
• Floating ribs: (11/12) last 2 ribs, no sternalattachment
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Rib Cage
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Sternum
• Flat bone• Made from fusion of :
– body – manubrium(knot), – xiphoid process( level
w/ 5th intercostalspace)