From the above data, it appears that explicit memory requires an intact medial temporal lobe. Such simplistic divisions as above will not support all the data that is available. For example, HM learned to perform the Tower of Hanoi puzzle, which is much more complicated than learning to draw a figure 8, and stretches the concept of implicit memory. Nevertheless, this terminology can be useful. Another psychological division of memory is semantic versus episodic.
Semantic memory is general knowledge about the world, unattached to any specific learning event.
Episodic is just the opposite. A little more psychology before we go back to the hippocampus. Short-term memory is generally thought to have a capacity of around 7 chunks of information. So, the area code in a phone number could be one chunk if you use it frequently. Long-term memory is thought to be nearly infinite in capacity.