ANAPHY 3-E Flashcards
main function of the bony thorax
serve as an expandable,
bellows-like chamber
the interior capacity expands and
contracts during inspiration and expiration, respectively.
Bony Thorax
The bony thorax consists of the
sternum, thoracic vertebrae, and 12 pairs of rib
protects important
organs of the respiratory system and vital structures within the
mediastinum, such as the heart and great vessels.
bony thorax
common site for marrow biopsy
sternum
a thin, narrow, flat bone with three divisions
sternum
It is composed of highly vascular cancellous tissue covered by a
thin layer of compact bone.
sternum
The total length of the adult sternum
is approximately
7 inches (18 cm).
The adult manubrium averages
2 inches,
or 5 cm, in length.
upper part of sternum is called
manubrium
The longest part of the sternum is the
body,
the body of sternum is about
4 inches or 1 cm
The union of the four segments of the body
begins during puberty and may not be complete until about the
age of
25 years
xiphoid process corresponds to the level of
T9-T10.
The most inferior portion of the sternum is th
xiphoid process
xiphoid process does not become totally ossified until about the age of
40 years
The uppermost border of the manubrium is easy to palpate and is
called the
jugular notch/ suprasternal or manubrial notch,
The sternal angle is at
the level of the disk space between
T4 and T5 for
Each clavicle articulates with the
manubrium laterally at the clavicular notch on each side and is called the
sternoclavicular joint
The anterior ribs do not unite directly with the sternum but do
so with a short piece of cartilage termed
costocartilage
The first seven pairs of ribs are considered
true ribs
What do you call to the last five pairs of ribs, numbered 8, 9, 10,
11, and 12.
false rib
The last__pairs of false ribs are unique in that they do not
possess costocartilage.
two
NOTE
Ribs 1 to 7 are termed true ribs and connect directly
to the sternum. The last five pairs of ribs, 8 to 12, are termed
false ribs. The last two pairs of ribs, 11 and 12, which are also
false ribs, are termed floating ribs because they are not connected
anteriorly.
posterior or vertebral end of a typical ris is ___
3-5 inches higher than anteriois or sternal end
This inside margin, which
contains the blood vessels and nerves, is termed the
costal groove.
