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Human skeleton Model

Human skeleton Model

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Key Structural Specifications

  • Total Bones (Adult): 206.
  • Total Bones (Infant): Approximately 270, which fuse later.
  • Bone Mass: Approximately 14% of total body weight (\(\approx 10\text{--}11 \text{ kg}\) for an average person).
  • Types of Bones: Long bones (femur), short bones (carpals), flat bones (sternum), and irregular bones (vertebrae).
  • Connective Tissues: Ligaments connect bone-to-bone; cartilage covers joint surfaces; tendons connect muscle-to-bone.
  • Peak Mass: Reaches maximum density between 25 and 30 years old
Component SubdivisionQuantityKey Features/Functions
Vertebral ColumnCervical (Neck)7Supports skull, allows movement.


Thoracic (Chest)12Attaches to ribs; rigid to protect heart/lungs.


Lumbar (Lower Back)5Supports weight of the torso.


Sacrum1 (5 fused)Connects spine to pelvic girdle.


Coccyx (Tailbone)1 (4-5 fused)Vestigial remnant.
Thoracic CageRibs24 (12 pairs)Protects thoracic cavity. Pairs 1-7 are true, 8-12 are false/floating.


Sternum (Breastbone)1Flat bone in the center of the chest.
Associated PartsScapula (Shoulder)2Shoulder blade; anchors arms to trunk.


Pelvis (Hip Girdle)2 (Innominate)Supports lower body and connects to spine.


$ 0.00 $ 0.00

 

Component/Feature         Specification
Size/Scale Diameter6 inches (150 mm) or 7 inches (175 mm/178 mm)
Vernier Reading1 minute of arc (30 seconds also common)
Main Scale0-360° with divisions of (0.5  circ ) (150 mm or 175 mm circle)
Vernier ScaleDouble ended vernier separated by (180 circ )
Collimator LensAchromatic, 178 mm focus, 32 mm clear aperture
Telescope LensAchromatic, 178 mm focus, 32 mm clear aperture
EyepieceRamsden Type ((10 times ) or (15 times ) with cross-line graticule
SlitUnilaterally adjustable, 6mm long
Fine AdjustmentProvided for both telescope and collimator (laterally and vertically)
Prism TableMarked with lines; leveling screws & interchangeable clamp
Main StructureHeavy cast metal with bright plated fittings (sometimes stainless steel scale)
AccessoriesPrism holder, Grating holder, Watchmaker’s eyeglass, L-key, Hardwood case



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