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)

"loo Os the Muscles
all the Proper Muscles seated be-
fore.
Bid. Tab. Intercoftales externi & InternL
26. F. i.
C C A .A
These are placed in the Intervals
of the Ribs as their Names Declare.
Their Number on each side is Twice
Eleven, equal to the Number of the
Jnterjlices in which they are lodged.
Their Originations are differently as-
signed by Anatomists, but we mall
acquiesce in the Opinion of Dr. Mujow
(after Stem) who thinks both {viz.)
Intercofiales Externi, and Interni, do
Arife from the Lower Edge of each
Superior Rib, and are inserted to the
Upper edge of each Inferior one.
These are Thin and Fleshy ; the
Fibres os the External pass from above
Obliquely downwards to the Forepart
oiOssaFubis (38): Those of the Internal, pig. mi.
descend in like manner obliquely to-
wards the Back-part or Os Sacrum (0): Fig.xriil
Their FibresDecuslating each other like
the Letter X.
The Scernum heing raided Ij dividing
its Cartilages on each fide srom the Bony
endings of the Ribs, the following Mufcle
mil appear underneath. Trian-