Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyAnimal Tissue3 Marks
Question
mammalian bone.
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Answer
Explain histological structure of mammalian bone.
$a.$ The bone is characterised by hard matrix called ossein which is made up of mineral salt hydroxy apatite $(Ca_{10} (P0_4)_6 (OH)_2).$
$b.$ An outer tough membrane called periosteum encloses the matrix.
$c.$ Blood vessels and nerves pierce through the periosteum.
$d.$ The matrix is arranged in the form of concentric layers called lamellae.
$e.$ Each lamella contains fluid filled cavities called lacunae from which fine canals called canaliculi radiate.
$f.$ The canaliculi of adjacent lamellae connect with each other as they traverse through the matrix.
$g.$ Active bone cells called osteoblasts and inactive bone cells called osteocytes are present in the
lacunae.
$h.$ The mammalian bone shows the peculiar haversian system.
$i.$ The haversian canal encloses an artery, vein and
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