INTRODUCTION TO ANATOMY
Anatomy is a science that deals with the structures of the body and the relationship of various parts to each other. Knowledge of these structures is necessary to understand their functions.
The subject matter of Anatomy includes:
1. Cytology – Study of cells
2. Histology – Study of tissues also called as Microscopic anatomy
3. Osteology – Study of bones
4. Myology – Study of muscles
5. Arthrology – Study of joints
6. Splanchnology – Study of organs
7. Neurology – Study of the nervous system
8. Angiology – Study of blood vessels
Descriptive terms used in Anatomy:
The arrangement of various parts of the body may be:
1. Symmetric e.g. limbs, eyes, ears, and lungs. Their arrangement on the right side and left side are similar or mirror images of each other.
2. Asymmetric e.g. spleen, heart and liver. The spleen lies entirely in the left side. Liver lies mostly on the right side.
The study of human body is done in anatomical position. In this position, the body
is erect, the head facing forwards, arms by the sides and palms of the hand facing forward.
The following are a few important terms, which are used to describe the human body.
1. Median line (mid sagittal plane): The central plane, which divides the body into two halves i.e., right, and left.
2. Medial: Nearer to the median line
3. Lateral: Away from the median line
4. Superior: Nearer to the head
5. Inferior: Nearer to the foot
6. Anterior: Nearer to the front surface of the body also called as ventral
7. Posterior: Nearer to the back surface of the body also called as dorsal
8. Proximal: Nearer to the origin of the structure
9. Distal: Away from the origin of the structure
10. Superficial: Nearer to the skin surface
11. Deep: Deeper from the skin surface
Movements at joints:
The following are a few descriptive terms used to convey the movements, which occur at various joint:
1. Flexion: A movement where similar surfaces come nearer to each other. This reduces the angle between two bones e.g. bending the forearm at the elbow.
2. Extension: Movement where similar surfaces go apart. Here, the angle between two bones is increased. It is the opposite of flexion e.g. straightening of the bent forearm.
3. Adduction: A movement, which brings the limb towards midline.
4. Abduction: It is opposite of adduction where the limb is drawn away from the midline.
5. Rotation: A movement around a central axis involving 360°.
6. Medial rotation: A rotation towards medial direction.
7. Lateral rotation: A rotation towards lateral direction.
8. Circumduction: A movement involving flexion, abduction, extension and adduction, which occur in a sequence. This movement occurs in shoulder, hip etc.
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