Cowper, William: Myotomia Reformata: Or A New Administration Of All The Muscles Of Humane Bodies: Wherein The true Uses of the Muscles are Explained, the Errors of former Anatomists concerning them Confuted, and several Muscles not hitherto taken notice of Described ; T whick are subjoin'd, A Graphical Description of teh Bones, And other Anatomical Observations (London, 1694)

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Os the Muscles

CHAP. XXIX.
Of the Muscles os the Thumb.
AUthors disagree concerning the
Number, Rise and Insertions of
thefe Muscles, which may partly
Proceed from that great Variety
which may be so frequently obferved
in divers Subjects: As they have moll
commonly appeared to me, I lliali
endeavour to Demonstrate; first of
the Benders of the Thumb.
Bid. t. Flexor tertii Internodii seu JLongifsimm
68-L- Pollicts.

This we have frequently observed
to have a Twofold Beginning; the
first. and superior of which Ariseth
Acutely from the Internal Extuberance
of the Os Humeri (zz) between the Fig. xvii.
Perforates and Performs, becoming a
Flcssiy Belly and then Tendinous joins
with the Middle Tendon of its other
Larger Head : The second or Inferior
Origin of this Muscle (is that part of
it which is commonly Dcscribcd ) A-
nsing: