Types of bone, Biology

TYPES OF BONE -

On the basis of its texture, a bone is of two types -

  1. Spongy or cancellous or tubercular bone and
  2. Compact or periosteal or dense bone.

213_difference between bones.png

2330_difference between bone and cartilage.png

Ossification (Bone formation)

The skeleton is formed entirely of cartilage in an early embryo.

The process of bone formation is called ossification or osteogenesis.

Bones are of the following types according to their source of formation -

1.      Cartilaginous or Replacing Bones -

  1. These bones develop from the pre-existing cartilage and practically replace the cartilage.
  2. They are also called endochondrial bones. Examples: humerus, femur.

2.      Investing or Dermal or Membrane Bones -

  1. These bones develop in the dermis of the skin as thin plates and sink to get attached over the original cartilaginous endoskeleton.
  2. In fact these bones become invested upon original cartilages hence their name.
  3. Examples: frontal, nasals, vomers and parietals of the skull.

3.      Sesamoid Bones -

  • These bones are formed in the tendons at the joints. Example: patella (knee-cap).

4.      Visceral Bones -

  1. These are formed in the soft organs (= viscera).
  2. Examples:

os cordis in the heart of some ruminants (e.g., deer),

os penis in the penis of most bats, insectivores, rodents (e.g., rats), carnivores (e.g., dog,walrus), whales, some primates (not man),

os clitoris in the clitoris of many carnivores, and

os palpebrae in the eyelids of crocodiles.

  • A small bone also develops in the crest of a bird and snout of a hog.

OSTEOCLASTS -

  1. These cells are derived from osteoblasts and osteocytes, rich in acid phosphatase and contain slightly basophilic cytoplasm and are lysosome-rich, multinucleate cells which destroy bone matrix.
  2. They are also called bone destroying cells.

OSTEOMYELITIS -

  • Inflammation of the bone marrow and adjacent bone and epiphysial cartilage.

PAGET'S DISEASE-

  • Irregular thickening and softening of bones. A bone kept in KOH remains unaffected

OSTEOMYELODYSPLASIA

  1. Enlargement of the bone marrow cavities, thinning of the osseous tissue, thinning of osseous tissue, large thin- walled vascular spaces, leukopenia (fall in WBC count) and irregular fever.
  2. When required, calcium and phosphate are released from the bone into the blood under the influence of the hormones, parathormone from the parathyroid glands and calcitonin from the thyroid gland.
Posted Date: 10/1/2012 3:15:49 AM | Location : United States







Related Discussions:- Types of bone, Assignment Help, Ask Question on Types of bone, Get Answer, Expert's Help, Types of bone Discussions

Write discussion on Types of bone
Your posts are moderated
Related Questions
a) In humans, is it the sperm or the ovum which verifies the sex of the offspring? b) Give a reason for your answer.   (a) The sperm verifies the sex of the off

In an adult male, which of the following is true? A. The plasma membranes of Leydig cells contain LH receptors. B. The plasma membranes of Sertoli cells contain FSH receptor

Q. Explain Shear Pin Model? Shear Pin Model: In this type, a shearing force is applied using a pin to shear the food Product. We are rupturing the element of the food product b

In a test cross: A.alleles of two genes is always involved. B.One parent must be homozygous recessive C.the physical manifestation of a trait can be deterimined. D.both A and C are

What is the concept of Lophophore? A unique double ring of hollow ciliated tentacles that surround the oral opening in some animal phyla. There is some debate as to whether the

How will you evaluate periimplant marginal tissues? Evaluation of the perimplant Marginal tissues can be done by using following parameters: i) Assessing the marginal mucos

Linkage of Health With Development Health, in its comprehensive or holistic sense, refers to the state of completephysical, mental, social and spiritual well being of a person.

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Describe the main cycle in metabolism of cornea. Main Cycle: Glycolysis is represented by the central chain and involves the anaerobic conversion of glucose into pyruvic

How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous. I