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Hyoid bone-- 1, Malleus--2, Incus--2, Stapes--2.


There are 3 pairs of small bones in the middle ear cavity. Three bones in each side, i. e. 6 bones. These bones are called Malleus, Incus and Stapes. www.buzzle.com

The position of the middle ear bones are shown in following diagram, here we can see these bones are not directly connected to the skeletal system.


There is a bone in neck region, called Hyoid bone, which is not directly connected to the skeletal system.


The one bone in neck (Hyoid) and 6 bones in two ears (Malleus, Incus and Stapes) make seven bones, which are not connected to the skeletal system.


Receives deoxygenated (impure) blood from the body via the superior and posterior vena cava to then pumps it to the right ventricle , where from it is sent to the lungs for purification.


De-oxygenated blood entering the heart through veins (from the tissues of the body) enters the heart through the right atrium before being pumped into the right ventricle.

The right atrium is one of the two atria of the heart, which function as receiving chambers for blood entering the heart.

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Right atrium also receives deoxygenated blood from wall of heart itself through coronary sinus.



First thing first: There are genes on chromosomes and the genes are expressed. All genes on a chromosome are not expressed at one go.



  • The X chromosome has hundreds of genes on it and many of these are controlling characters related to organs other than the reproductive system.
  • For example, gene for colourblindness present on X, is responsible for maintenance of photoreceptors in healthy cone cells of retina.
  • Then there are genes on X chromosome which allow hepatic cells to produce clotting factors ; hence mutation in such X linked genes cause hemophilia.
  • So, It can not be said that genes on X chromosome are expressed only in cells associated with reproductive system; some of these genes are actually expressed in various somatic tissues of both sexes through entire life.
  • That is not entirely true for genes present on Y chromosome, because Y chromosome is present only in males: i.e. Y linked genes are absent in all female cells .
  • There is one AMELY gene on Y, that codes for extracellular enamel protein amelogenin which expresses during development of tooth enamel, a nonreproductive tissue but this is rather an exception.
  • Most of the Y-linked genes are expressed in organs of male reproductive system such as testes, prostate gland, etc.
  • Expression of SRY gene of Y chromosome initiates sex differentiation very early in embryonic life.
  • So, expression of genes on Y chromosome are restricted in male reproductive organs only, and some of these genes express for only a brief period of embryonic life.


At least 2-3 days after a woman's menstrual cycle.


Try to get in the habit of doing a breast self-examination once a month to familiarize yourself with how your breasts normally look and feel.

Examine yourself 2-3 days after your period ends, when the breasts are least likely to be swollen and tender. If you are no longer having periods, choose a day that's easy to remember, such as the first or last day of the month.

Source: http://www.breastcancer.org/symptoms/testing/types/self_exam




Capillaries are hollow tubular microscopic blood vessels 5 to 10 micrometres (µm) in diameter and having a wall one cell thick.

They are the smallest blood vessels in the human body. They form a network between the arterioles and venules, as seen below.



Gigantism. Condition is generally caused by a tumour in pituitary gland; affected individuals grow 7 to 9 feet tall.


It's a condition caused by over-production of growth hormone i.e Somatotrophin #(STH)# from anterior pituiatry during early stages of life(during childhood).

It causes abnormal increase in height and sometimes abnormal growth of different parts of body i.e hands, feet, jaws etc...

enter image source here


Hope it helps...

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