(seq. 131)

61 Lect. 5.

fascia tendinosa. This gives firmness to the Mus-
cle & prevents it's being injured where there is frequent Mo-
tion & great Strength required. The Muscles have both an
absolute & relative Force. Muscles take their Names some-
times from their Use, & sometimes from their Situation
^{Muscles are simple and compound} A Muscle is divided into Head, Belly & Tail ^{and into Origin & Insertion}, tho' this does not
seem to answer any End. They are also divided into three
Species viz. Oblong, Hollow, & mixt. The oblong are such, as are
designed to support & move the Parts to which they are fixed
as the Muscles of the Extremities. The Hollow are ^{made up of fibres which have neither Beginning nor End & [?]} to comp-
ress their Contents equally on all Sides; as the Heart. The
mixed are such as not only move the Parts to which they are
fixed, but also Compress their Contents, as the Abdominal.
The Oblong are divided into Rectinial, Penniform, Semi-
penniform, Radiated, & such as have two or more Bellies
joined together by a Tendon in the Middle which acts over
a Pulley. The Rectineal have their Fibres in a strait
Line, & parrallel to each other, in the same direction with
the Axis of the Muscle. The Penniform have their Fibres
in an oblique Direction to a Tendon passing in or near
their Axis or on their outside. When Rectilineal Muscles
contract, their more internal Fibres are compressed by the