_ Q. Why hath a man shoulders and arms? A. To lift and carry burdens.
       Q. Why are the arms round? A. For the swifter and speedier work.
       Q. Why are the arms thick? A. That they may be strong to lift and bear burdens, and thrust and give a strong blow; so their bones are thick, because they contain much marrow, or they would be easily corrupted and injured.
       Q. Why do the arms become small and slender in some diseases, as in mad men, and such as are sick of the dropsy? A. Because all the parts of the body do suffer the one with the other; and therefore one member being in grief, all the humours do concur and run thicker to give succour and help to the aforesaid grief.
       Q. Why have brute beasts no arms? A. Their fore feet are instead of arms, and in their place. _

Aristotle's Book...Concerning The State Of Man's Body
Of The Head
Of The Eyes
Of The Nose
Of The Ears
Of The Mouth
Of The Teeth
Of The Tongue
Of The Roof Of The Mouth
Of The Neck
Of The Shoulders And Arms
Of The Hands
Of The Nails
Of The Paps And Dugs
Of The Back
Of The Heart
Of The Stomach
Of The Blood
Of The Urine
Of The Gall And Spleen
Of Carnal Copulation
Of The Seed Of Man And Beasts
Of Hermaphrodites
Of Monsters
Of The Child In The Womb
Of Abortion And Untimely Birth
Of Divers Matters
The Problems Of Marcus Antoninus Sanctipertias
The Problems Of Alexander Aphrodiseus