DOI Page / Citation link:
https://doi.org/10.11588/diglit.4812#0090
8o OBSERVATIONS ON T H E^
of the foetus to be nouriihed in one way before it gets its heart and vesselsj
but in a different way after it gets them ?
In short, as all the veins, whether lymphatic or red, convey their liquors
dire&ly to the heart, and, by the intervention only of the heart, to the
brain, the existence of the heart mussi precede the growth os the fyrain. I
do not say, on the other hand, that the hearty is formed besore the brain •
because, as these two organs acl: upon each other in a circle, it appears to
me manifest that they must be coeval.
SECT. II.
On the next argument, that paliied limbs shrink, as if the sources os nou-
rishment were intercepted, I would observe, that this shrinking is to be ex-
pected, on the supposition that the arteries convey the nourishment; sor,
jirjt, Nuck found that the inferior maxillary gland did not properly secrete
the saliva when its nerves were cut *. Surely we are not, therefore, to con-
clude that the saliva is derived from the nerves. The proper conclusion is,
that the organs of secretion are not mere sieves, but possess seeling and ac-
tivity, without which they are incapable of performing their proper ossices.
When, therefore, the nerves of a limb are paliied, it shrinks, because the
arteries are deprived of that degree of nervous energy which enables them
to acl: properly in secreting and applying the nourishment.
And to support this way of reasoning, it may be remarked, that where,
in consequence of pain, luxation, fra&ure, laceration of a tendon, or other
accident, a limb is consined long to one posture, it shrinks ; and that, on the
Other hand, exercismg any limb much increases its bulk as well as flrength,
mowing the essect os activity in nutrition.
Next,
*
* Nuck Sialographia 1690, p. 24. ' Si ligatura injiciatur in nervum ad glandulam tendentem, aut
' transversim dissecetur nervus, non tamen ideo secretionem cessare observabimus, sed tardiorem solum-
modo et magis lentam procedere.
of the foetus to be nouriihed in one way before it gets its heart and vesselsj
but in a different way after it gets them ?
In short, as all the veins, whether lymphatic or red, convey their liquors
dire&ly to the heart, and, by the intervention only of the heart, to the
brain, the existence of the heart mussi precede the growth os the fyrain. I
do not say, on the other hand, that the hearty is formed besore the brain •
because, as these two organs acl: upon each other in a circle, it appears to
me manifest that they must be coeval.
SECT. II.
On the next argument, that paliied limbs shrink, as if the sources os nou-
rishment were intercepted, I would observe, that this shrinking is to be ex-
pected, on the supposition that the arteries convey the nourishment; sor,
jirjt, Nuck found that the inferior maxillary gland did not properly secrete
the saliva when its nerves were cut *. Surely we are not, therefore, to con-
clude that the saliva is derived from the nerves. The proper conclusion is,
that the organs of secretion are not mere sieves, but possess seeling and ac-
tivity, without which they are incapable of performing their proper ossices.
When, therefore, the nerves of a limb are paliied, it shrinks, because the
arteries are deprived of that degree of nervous energy which enables them
to acl: properly in secreting and applying the nourishment.
And to support this way of reasoning, it may be remarked, that where,
in consequence of pain, luxation, fra&ure, laceration of a tendon, or other
accident, a limb is consined long to one posture, it shrinks ; and that, on the
Other hand, exercismg any limb much increases its bulk as well as flrength,
mowing the essect os activity in nutrition.
Next,
*
* Nuck Sialographia 1690, p. 24. ' Si ligatura injiciatur in nervum ad glandulam tendentem, aut
' transversim dissecetur nervus, non tamen ideo secretionem cessare observabimus, sed tardiorem solum-
modo et magis lentam procedere.