Osteon Haversian Canal Lamella Osteocyte canaliculi Microscopic Anatomy of the Bone The Structural Unit of Compact Bone is called Osteon or Haversian System Functional unit of the team ID: 914369
Download Presentation The PPT/PDF document "As soon as you come in! Define these wor..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
As soon as you come in!Define these words
Osteon
Haversian
Canal
Lamella
Osteocyte
canaliculi
Slide2Microscopic Anatomy of the Bone
The Structural Unit of Compact Bone is called
Osteon
or
Haversian System
Functional unit of the team
Slide3Has concentric tubes of bone matrix called
lamellae
surrounding a
central canal that serves as a passageway for blood vessels and
nerves.
Slide4Volkmann’s (perforating) canals lie at right angles to long axis
connect the blood and nerve supply of the
periosteum
to these central canals
and medullary cavity.
Slide5Mr. Verdi’s baby’s head
Slide6Osteocyctes occupy lacunae at the
junction
of lamellae.
Slide7Circumferential lamellae = just beneath the
periosteum
around the entire circumference of bone.
Interstitial Lamellae = lie between intact
osteons
filling the space in between
Slide8Spongy bones lacks
osteons
, but has
trabeculae that align
along lines of stress.
Slide9Slide10Slide11Slide12Slide13Bone Composition
Organic:
A. osteogenic, osteoblasts, osteocytes, osteoblast -- all cell types
B. Osteoid -- ~1/3 of matrix including ground substance and collagen fibers
Resilent and great tensile strength “sacrificial bonds” dissipate energy thus preventing fractures
Slide14Inorganic: ~65% by mass of inorganic salts. Mainly calcium phosphate crystals. This accounts for the hardness of bones which resists compression. Drink your milk!!
Slide15This mix of collagen, proteins, and minerals makes bone durable and strong.
½ as strong as steel at resisting compression and just as strong as resisting tension.
And obviously bones remain long after death, leaving remains that allow us to study humans from the past