Far more than 5, or even the 7 I had once thought of. The original 5 can be an obvious class of their own: We have many, many senses. If you're a splitter, you might come up with 29 or more (though the expert splitters still only have 21). Here's a quick, organized, look at them:
External Senses, or sensing incoming information from the environment. These are what we traditionally think of when we think of senses. Aristotle still missed one.
Sight Suite
Color
Brightness
Taste Suite
Sweet
Salty
Sour
Bitter
Umami (sensing the amino acid glutamate)
Touch Suite
Pressure
Itch
Thermoception (hot / cold)
Nociception (pain)
Cutaneous (skin)
Hearing (I have not seen this broken into loudness and pitch, et cetera)
Smell (combines with taste to produce array of flavors)
Magnetoception (sense of direction using the earth's magnetic field)
Boundary Senses. I couldn't decide if these were external or internal. In a way, they are both: keeping track of the body in relation to the environment or itself. they are more than just internal monitors.
Proprioception (sense of where your body is)
Equilibrioception (balance, acceleration, directional changes, gravity; also known as the "Vestibular labyrinthine system")
Chronoception (sense of time. This one is under debate - there is no understood mechanism, but we have a demonstrated accurate sense of it)
Muscle tension
Internal Senses, or senses of the body. These are your status managers, making sure that everything is running fine.
Hunger
Thirst
"Stretch"
Full lungs (breathe out)
Full bladder (go pee!)
Full stomach (stop eating)
Full colon (go poo)
Blood vessels (this sense is implicated in headaches)
Chemoreception (detects blood-born hormones and drugs, oxygen levles... and triggers vomiting)
Thermoception (Internal body temperature)
Nociception (pain)
Somatic (bones / joints)
Visceral (organs)
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