Forensic Med Lecture 7 (Chapter 7 Firearm & Explosion).pptx

: What are the two types of firearm weapons?

1. Rifled weapons: Includes short weapons (handguns) and long weapons (rifles). 2. Non-rifled weapons: Includes sporting guns, military shotguns, and homemade country shotguns.

Injuries related to special types of projectiles

1. Rubber and Plastic Bullets: 2. Country made shotgun missiles: 3. Blank Shells:

: What are the types of firearm injuries?

: Injuries caused by firearm projectiles can be homicidal, suicidal, or accidental and depend on the weapon type, firing distance, and direction.

What are explosion injuries?

: Injuries caused by the ignition or detonation of explosives, releasing energy and dispersing fragments at high speed.

What injuries are caused by rubber and plastic bullets?

: Non-lethal injuries such as lacerations, fractures, and sometimes soft tissue penetrations.

Q: What is a firearm weapon?

A: An instrument that discharges a missile by the force of gases produced by the combustion of a propellant in a closed space.

Q: What are the three principal parts of a firearm?

A: Barrel, Action, and Grip.

What marks can be found around inlet wounds in firearm injuries?

Burning Blackening (soot) Tattooing (reddish-brown punctate lesions)

Q: How do inlet wounds vary with firing distance?

Close firing: Circular wound with powder marks. Medium distance: Powder marks reduced. Long distance: Only bullet entry marks are visible.

What is the medico-legal importance of powder marks?

Diagnosing firearm injuries Estimating firing distance Identifying type of powder used Differentiation between inlet and exit Determination of the direction of firing

Medico Legal Importance of Wads:

Diagnosis of firearm injury Diagnosis of firearm weapon type Differentiation between inlet and exit wounds Estimation of distance of firing Determination of the weapon bore

What is the doctor's duty in firearm injuries?

Emergency treatment and life-saving measures Antibiotic administration Reporting to police Documenting injuries (photographs and reports)

What is rifling in firearms?

Grooves and ridges spiraling along the barrel's inner surface that stabilize the bullet, increasing range, velocity, and penetration power.

General Characters of Firearm Injuries

Loss of Substance: Presence of two wounds inlet and exit. Presence of Powder marks

What are the types of explosion injuries?

Primary: Blast wave injuries (e.g., eardrum rupture, blast lung). Secondary: From flying missiles or fragments. Tertiary: From blast wind throwing debris. Quaternary: From heat and fumes causing burns and tattooing.

MLI of Rifling:

Rifling marks help in the identification of the used weapon.

What are the types of projectiles used in firearms

Shots (disperse with distance). Wads (internal and external). Bullets (cause non-dispersed wounds).

What are the medico-legal duties of a doctor in explosion injuries?

Treat victims, notify authorities, document injuries, and perform imaging.