DOI Page / Citation link:
https://doi.org/10.11588/diglit.6271#0072
( *6 )
f srt of the first vertebra is entirely cartilage. The
second vertebra often consists of five and six portions.
The spinous processes are all cartilage.
When aneurism of the aorta is very large, the bodies of
the vertebrae are occasionally absorbed, but the inter-
vertebral substance remains entire. This is a singular
fact, that bone should be sooner absorbed than carti-
lage. The same phenomenon takes place in caries from
other causes. The spinal marrow is always defended
in these cases by a deposit of coagulable lymph.
The spine is subject to caries, distortion, and spina bifida,
called also hydrorachitis. The latter consists of a tu-
mour rilled with water, which makes its way betwee*
the processes of a vertebra, and divides it into two.
THORAX.
The thorax, or chest, forms the upper part of the trunk.
It resembles an arched bony cavity, narrow above, broad
below, flat anteriorly, hollow posteriorly, and convex late-
rally. The bones which compose the thorax, are the twelv*
dorsal vertebra5, already described, the sternum, and twenty-
four ribs.
COSTjE.
The ribs are twenty-four semicircular bones, situated
twelve on each side of the chest, and extending obliquely from
the dorsal vertebra? round towards the sternum, to which
they are connected by strong cartilages. They are distin-
guished into seven true ribs on each side, or those whose car-
tilaginous extremities are affixed to the sternum ; and fiv«
spurious or false on each side, whose extremities do not reach
the breast-bone. Each rib may be divided into a body, or
middle part, two extremities, two margins, and two surfaces.
The first rib is far the shortest, and is the most curved ; it
is broader than the other ribs, and placed in a transverse «h-
f srt of the first vertebra is entirely cartilage. The
second vertebra often consists of five and six portions.
The spinous processes are all cartilage.
When aneurism of the aorta is very large, the bodies of
the vertebrae are occasionally absorbed, but the inter-
vertebral substance remains entire. This is a singular
fact, that bone should be sooner absorbed than carti-
lage. The same phenomenon takes place in caries from
other causes. The spinal marrow is always defended
in these cases by a deposit of coagulable lymph.
The spine is subject to caries, distortion, and spina bifida,
called also hydrorachitis. The latter consists of a tu-
mour rilled with water, which makes its way betwee*
the processes of a vertebra, and divides it into two.
THORAX.
The thorax, or chest, forms the upper part of the trunk.
It resembles an arched bony cavity, narrow above, broad
below, flat anteriorly, hollow posteriorly, and convex late-
rally. The bones which compose the thorax, are the twelv*
dorsal vertebra5, already described, the sternum, and twenty-
four ribs.
COSTjE.
The ribs are twenty-four semicircular bones, situated
twelve on each side of the chest, and extending obliquely from
the dorsal vertebra? round towards the sternum, to which
they are connected by strong cartilages. They are distin-
guished into seven true ribs on each side, or those whose car-
tilaginous extremities are affixed to the sternum ; and fiv«
spurious or false on each side, whose extremities do not reach
the breast-bone. Each rib may be divided into a body, or
middle part, two extremities, two margins, and two surfaces.
The first rib is far the shortest, and is the most curved ; it
is broader than the other ribs, and placed in a transverse «h-