Cell walls in lath martensite - Meaning What does cell walls mean in the context of lath martensite? Are they grain boundaries?

Quote (page 66 Structure and properties of engineering alloys - Smith): In the lath martensite of low-carbon steels, there is a high density of individual dislocations and many cell walls.

Sorry for the stupid question, I don't find any image to understand it.

Thank you for your time.
According to this Wikipedia page:  


  Martensite, named after the German metallurgist Adolf Martens
  (1850–1914), most commonly refers to a very hard form of steel
  crystalline structure, but it can also refer to any crystal structure
  that is formed by diffusionless transformation.1 It includes a class
  of hard minerals occurring as lath- [emphasis mine] or
  plate-shaped crystal grains.


Lath basically means the shape of a woven screen when viewed close up, or like a grid of alternating appearance.