Investment banking services?

The Motley Fool has recently released a report on the income and revenues of the investment bank JP Morgan. They break the earnings down into separate categories within the company, which I am trying to understand if someone can please help. Here are the categories I am trying to understand the subtle differences between:
Retail Financial Services
Commercial Banking
Treasury and Securities Services
Asset Management
Corporate/Private Equity

Some of these categories look very similar to me. Thanks very much for any help.
http://www.fool.com/investing/general/20…

retail financial services - when an investment advisor deals with an individual investor one to one and takes orders from the client. Revenue comes from the commissions.

commercial banking - when the bank gives loans to a company and revenue comes from the interest spread.

treasury and securities - this sounds like bond deals, I am not too sure. It could be the prop trading of the bank itself.

Asset Management - when portfolio managers manage funds either in a pool (mutual funds) or for individual or institutional investors. This is discretionary, meaning manager decides on what he/she buys. They charge a certain management fee.

Corporate/Private Equity - Helping companies issuing debt or equity and selling them to individual and/or institutional investors. Percentage commission.

Hope it helps :)