(a) T.S.of Bone
(i) Lamellae
(ii) Lacunae
(iii) Central (Haversian canal)
(b) The matrix of the bone is rich is calcium salts and collagen fibres which gives the bone its strength.
(c) c - Haversian canal
They surround the blood vessels and nerve cells throughout the bone and communicate with bone cells in the bone matrix through connections called canaliculi

Permanent tissues:
(i) Permanent tissues are those in which, growth has stopped either completely or for the time being. At times, they become meristematic partially or wholly.
(ii) Permanent tissues are of two types namely (a) simple tissue and (b) complex Simple tissue: Simple tissue are homogeneous - composed of structurally and functionally similar cells. Eg: Parenchyma, collenchyma and sclerenchyma.
Parenchyma
(i) Parenchyma are simple permanent tissues composed of living cells.
(ii) Parenchyma cells are thin walled, oval, rounded or polygonal in shape with well developed spaces among them.
(iii) In aquatic plants, parenchyma possesses intercellular air spaces, and is named as aerenchyma.
(iv) When exposed to light, parenchyma cells may develop chloroplasts and are known as chlorenchyma.
Functions:
Parenchyma may store water in many succulent and xerophytic plants. It also serves the functions of storage of food reserves, absorption, buoyancy, secretion etc

Collenchyma :
(i) Collenchyma is a living tissue found beneath the epidermis.
(ii) Cells are elongated with unevenly thickened non-lignified walls. Cells have rectangular oblique or tapering ends and persistent protoplast.
(iii) They possess thick primary non-lignified walls.
Functions:
They provide mechanical support for growing organs.

Sclerenchyma :
(i) Sclerenchyma consists of thick walled cells which are often lignified,
(ii) Sclerenchyma cells are dead and do not possess living protoplasts at maturity. Sclerenchyma cells are grouped into (i) fibres and (ii) sclereids.
(iii) Fibres are elongated sclerenchymatous cells, usually with pointed ends. Their walls are lignified. Fibres are abundantly found in many plants. Eg., Jute.
Sclereids:
(i) Sclereids are widely distributed in plant body. They are usually broad, may occur in single or in groups.
(ii) Sclereids are isodiametric, with lignified walls. Pits are prominent and seen along the walls.
(iii) Lumen is filled with wall materials. Sclereids are also common in fruits and seeds.

They contain a respiratory pigment called haemoglobin which is involved in the transport of oxygen to tissues