Drawing definition
A drawing is a visual representation made by marking lines, shapes, or tones on a surface (paper, canvas, digital screen, etc.) using tools such as pencils, pens, charcoal, ink, or styluses.
Core Definitions
As a noun:
A drawing is a work of art or a diagram produced by drawing lines and marks on a surface, typically to represent objects, figures, scenes, or abstract ideas.
As a verb (to draw):
To draw is to produce such marks deliberately on a surface, using hand-held tools or digital means.
Types of Drawing
| Type | Description |
|---|---|
| Freehand drawing | Drawn without mechanical aids; relies on hand and eye coordination |
| Technical drawing | Precise, scaled diagrams used in engineering, architecture, and design |
| Life drawing | Drawing from a live subject, often the human figure |
| Gesture drawing | Quick sketches capturing movement and posture |
| Contour drawing | Focuses on the outline or edges of a subject |
| Illustration | Drawing made to accompany or explain a text |
| Caricature | Exaggerated drawing of a person for comic or satirical effect |
Drawing in Different Contexts
- Art: A foundational discipline; drawing is considered the basis of all visual arts.
- Engineering/Architecture: Technical drawings (blueprints, CAD diagrams) communicate precise measurements and specifications.
- Law/Finance: A "drawing" can also refer to withdrawing funds from an account (e.g., a bank drawing or bill of exchange).
- Lottery: A "drawing" refers to the random selection of a winner.
Etymology: From Old English dragan - "to drag or pull," which evolved to mean pulling a pen/pencil across a surface to create lines.
Define drowning..diff between dry and wet drowning..fmt mbbs
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drowning dry wet classification mechanism
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DROWNING
Definition
Drowning is a form of asphyxia due to aspiration of fluid into the air-passages, caused by submersion in water or other fluid. It is a non-violent form of mechanical asphyxia. Complete submersion is not necessary - submersion of the nose and mouth alone for a sufficient period can cause death.
- The Essentials of Forensic Medicine and Toxicology, 36th ed. (2026)
Stages / Mechanism of Drowning
| Stage | Event |
|---|---|
| 1. Surprise/Panic | Person falls in water; initial panic, voluntary breath-holding |
| 2. Breath Holding | CO2 accumulates in blood until respiratory centre is stimulated |
| 3. Water Inhalation | Inevitable inhalation of large volumes of water; coughing expels remaining air |
| 4. Convulsions | Hypoxic convulsions; loss of consciousness |
| 5. Death | Cerebral hypoxia leads to death - usually in 4-5 min (fresh water) or 8-10 min (sea water) |
Types of Drowning
1. Wet Drowning (Typical / Primary Drowning) - ~80%
- Water is actively inhaled into the lungs
- Also called "typical drowning"
- Death occurs within minutes secondary to cardiac arrest or ventricular fibrillation
- Victim has severe chest pain
- Hyperkalemia is a relatively minor contributing factor
2. Dry Drowning - 10-20%
- No water enters the lungs
- Death results from immediate sustained laryngeal spasm triggered by the rush of water into the nasopharynx or larynx
- Thick mucus, foam, and froth may develop, forming a plug
- More common in:
- Children
- Adults under alcohol or sedative-hypnotic influence
- Resuscitated victims report panoramic views of past life and pleasant dreams without distress
3. Secondary Drowning (Post-Immersion Syndrome / Near Drowning)
- Victim is resuscitated and survives for >24 hours after submersion
- Complications include:
- Hypoxemia and brain damage
- Pulmonary oedema, ARDS
- Metabolic acidosis
- Electrolyte disturbances (hyponatremia, hyperkalemia)
- Hemoglobinuria, chemical pneumonitis, cardiac arrhythmias
- Death occurs in ~20% of cases from half to several hours after resuscitation
- 5-10% of survivors develop serious neurologic damage
4. Immersion Syndrome (Hydrocution / Submersion Inhibition) - 1-2%
- Death from cardiac arrest due to vagal inhibition - no true drowning
- Triggers:
- Cold water stimulating skin nerve endings
- Water striking the epigastrium
- Cold water entering ear drums, nasal passages, pharynx/larynx
- Seen in emotionally tense individuals (e.g., intending suicides)
Dry vs. Wet Drowning - Key Differences
| Feature | Dry Drowning | Wet Drowning |
|---|---|---|
| Water in lungs | Absent | Present (large amounts) |
| Mechanism | Laryngeal spasm | Aspiration of water |
| Incidence | 10-20% | ~80% |
| Lungs at autopsy | No water; may be pale/collapsed | Ballooned, waterlogged, emphysema aquosum |
| Froth at mouth | Absent or minimal | Characteristic fine white lathery froth |
| Chest pain | Absent | Present (severe) |
| Common in | Children, alcoholics, sedated adults | General drowning victims |
| Cause of death | Asphyxia from laryngospasm | Asphyxia + VF (fresh water) / asphyxia (salt water) |
| Paltauf's hemorrhages | Absent | Present (~50% cases) |
| Diatoms in organs | Absent | Present |
Pathophysiology: Fresh Water vs. Salt Water Drowning
| Parameter | Fresh Water | Salt Water |
|---|---|---|
| Osmolarity | Hypotonic (0.05% NaCl) | Hypertonic (3.5% NaCl) |
| Fluid shift | Water absorbed into blood (hypervolemia) | Fluid drawn from blood into alveoli (hypovolemia) |
| Blood volume | Increases up to 50% | Decreases (haemoconcentration) |
| Electrolytes | Hyponatremia, ↑K+, ↓Ca²+ | Hypernatremia, haemoconcentration |
| RBCs | Lysed (haemolysis) | Crenated |
| Surfactant | Denatured/destroyed | Diluted/washed away |
| Cause of death | Ventricular fibrillation (3-5 min) | Asphyxia, heart failure from ↑viscosity (8-10 min) |
| Treatment | Defibrillator + electrolyte correction | Oxygen + hypotonic fluid infusion |
Post-Mortem Findings in Drowning
External
| Sign | Description |
|---|---|
| Froth at mouth/nostrils | Fine, white, lathery; doesn't collapse easily; most characteristic sign |
| Cutis anserina (Gooseflesh) | Erector pilae spasm; seen on thighs; rare in India (warm water) |
| Cadaveric spasm | Hands may tightly grip weeds, gravel - proves person was alive when entering water |
| Washerwoman's hands | Wrinkling/maceration of hands and feet |
| Scraping/abrasions | From contact with bed/rocks |
Internal
| Sign | Description |
|---|---|
| Emphysema aquosum | Overinflated, ballooned lungs; fluid penetrates alveolar walls; present in ~80% |
| Oedema aquosum | Flooding of lungs with water (in unconscious at time of drowning) |
| Rib impressions | Grooves on lateral lung surfaces from overinflation pressing against ribs |
| Paltauf's hemorrhages | Pale pink/bluish-red sub-pleural hemorrhages; 3-5 cm; in ~50% cases, lower lobes |
| Water in stomach | Swallowed water; 150-200 mL |
| Petechiae | Absent (vessels compressed by fluid in alveoli - distinguishes from strangulation) |
| Diatoms | In lung, bone marrow (femur/sternum), liver, kidney, brain - strongest evidence of antemortem drowning |
Diatoms - Medico-Legal Importance
- Microscopic algae with silica shells; found in fresh and salt water
- In a live victim, circulation transports diatoms from ruptured alveoli to bone marrow, brain, liver, kidney
- Positive diatoms in bone marrow = person was alive when submerged (antemortem drowning)
- Best sample: Bone marrow of long bones (femur, tibia, humerus) or sternum
- If body is found in water after death, diatoms will NOT reach distant organs
Medico-Legal Aspects
| Manner | Key Features |
|---|---|
| Accidental | Most common; epileptics, alcoholics, infants in shallow water |
| Suicidal | Intending suicides; immersion syndrome more common; weighted objects tied to body |
| Homicidal | Rare; usually in young children, unconscious, or intoxicated persons; may show pre-mortem injuries |
Sources: The Essentials of Forensic Medicine and Toxicology, 36th ed. (2026); P.C. Dikshit Textbook of Forensic Medicine and Toxicology
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