(seq. 49)

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21 Lect. 2

the Center of the Body, & run nearly in the Center of each
Limb, giving a Branch to every Part. In the Limbs, they
lie, as near the Bones, as can be, & thus generally lie in an
hollow Part, so as not to be much stretched or compressed, & comm-
only in the Bend of any Part. Mr. John Hunter observed, that
Branches near the Heart, go off at right Angles, which in some
Measure to lessen the Impetus of the Blood's Motion; & at a Dis-
tance at Acute Angles, to quicken in some Measure the Velocity.
Arteries in their March, in some places run serpentine or
are convoluted, as in the Uterus, because of the greater Dis-
tension at different Times of Gestation according to Dr. Friends
Observations. But Dr. Hunter thinks, that is not the Reason, for
in the greatest Distintion the Artery is still more convoluted,
which therfore is to answer some other Purpose.

There are Valves in the Arteries, but it is only from their
Beginning, viz. in the Aorta & pulmonary Artery, which
prevents the Return of the Blood back to the Heart. The Valves
are generally made up of three folds or Membranes, but there
are Instances only of two End of Lecture 4 [?] Lect 5 Feb 23 Anatomists have been accustomed
to divide the Substance of the Body into different Layers, the
Coats of the Arteries are said by some Authors to be stiffly partly muscular
but they are manifestly not so in Colour, but they are made up of an elastic Liga-
mentous Substance of a particular Texture resembling white
Leather, that is elastic both in longitudinal & Transverse

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