[Go] difference between 'anatomical structure' terms?

[Maria Costanzo]

Hi all,

This might be a naive question from someone who's just starting to  
annotate an organism that actually has anatomy... I'm planning to  
request some terms for formation of anatomical structures in  
Aspergillus, and am considering these two terms for their parent:

GO:0010926 anatomical structure formation
Definition
     The process pertaining to the initial formation of an anatomical  
structure from unspecified parts. This process begins with the  
specific processes that contribute to the appearance of the discrete  
structure and ends when the structure is recognizable. An anatomical  
structure is any biological entity that occupies space and is  
distinguished from its surroundings. Anatomical structures can be  
macroscopic such as a carpel, or microscopic such as an acrosome.  
[source: GOC:dph, GOC:tb]

or its child term
GO:0048646 anatomical structure formation involved in morphogenesis
Definition
     The developmental process pertaining to the initial formation of  
an anatomical structure from unspecified parts. This process begins  
with the specific processes that contribute to the appearance of the  
discrete structure and ends when the structural rudiment is  
recognizable. An anatomical structure is any biological entity that  
occupies space and is distinguished from its surroundings. Anatomical  
structures can be macroscopic such as a carpel, or microscopic such as  
an acrosome. [source: GOC:dph, GOC:jic, GOC:tb]

Could someone please explain the difference between these terms?

Thanks,
Maria