structures that may be penetrated by a horizontal stab wound from the anterior midline to the space between the second and third tracheal rings.

Introduction: the structures that may be penetrated  by a horizontal stab wound at the level of
the second and third trachea rings in the anterior midline are the anterior
relations of the trachea.

Anterior relations of the trachea: from superficial deep
are:

1.      
Skin

2.      
Superficial fascia

3.      
Investing fascia

4.      
Sternohyoid

5.      
Sternothyroid

6.      
Pretracheal fascia

7.      
Anterior jugular vein

8.      
Thyroid isthmus

9.      
Trachea.