4.2 The Thorax Flashcards
is a cage composed of bones and cartilages, which affords protection of several very vital organs, the heart with its trunk vessels and the respiratory organs
The thorax, the upper part of the trunk
breast bone
Sternum
no. of bones Ribs or costae
12 pairs
no. of bones Costa cartilages
12 pairs
between a rib and the body of a vertebra
Costovertebral
between a rib and a transverse process of a vertebra
Costotrasverse
between a rib cartilage and the sternum
Sternocostal or costosternal
between a rib and its costal cartilage
Costochondral
between the adjacent anterior margins of costal cartilages of 6th to 10th ribs
Interchondral
between the sternum and the clavicle
Sternoclavicular
between the manubrium and the body of the sternum
Manubriosternal
between the body of the sternum and its xiphoid process
Xiphisternal
flat bone
Sternum
Sternum parts
- Manubrium
- Body or gladiolus
- Xiphoid process
- Jugular notch (suprasternal notch)
- Clavicular notches
- Costal notches – 1 and 1/2
Manubrium
Costal notches – 4 and half notches
Body or gladiolus
one-half notch
Xiphoid process
other name for ribs
costae
- Dorsal extremity or vertebral extremity (end)
- Body or shaft with an angle
- Ventral extremity or sternal extremity
Ribs (costae) – 12 pairs
is a long bone that lies vertically in the midline of the anterior chest wall
Sternum
the upper part and represents the handle of the sword
Manubrium
depression on the upper surface of the manubrium
Clavicular notches
extends from the manubrium to the xiphoid process and is the largest part of the sternum
The body or gladiolus
Sternal angle other name
angle of Louis or Ludwig
is marked by a prominent transverse ridge at the junction of the manubrium and the body of sternum
Sternal angle (angle of Louis or Ludwig)
inferior part of the sternum
Xiphoid process
are niches on the lateral margins of the sternum
Costal notches
long, curved, flat bones that from the posterior wall, lateral walls and part of the anterior wall of the thorax
Ribs
slightly expanded posterior end
Head (Dorsal extremity of Tubercle)
slightly constricted part connecting the head to the body
Neck (Dorsal extremity of Tubercle)
small prominence on the dorsal surface at the junction of the neck and body
Tubercle (Dorsal extremity of Tubercle)
long flat, curved part that extends from the neck around the chest wall
Body of the ribs
At its lower margin there is a groove- the costal groove- from an intercostal artery, vein and nerve
Body of the ribs
is a prominence in front of the neck where the rib becomes bent anteriorly
Angle of a rib
anterior end that articulates with its costal cartilage
ventral or sternal extremity
has 2 grooves running transversely on its upper anterior surface for the subclavian artery and vein
The first rib
have a single articular surface on the head, not two
1st, 10th, 11th and 12th ribs
have no tubercles
11th and 12th ribs
articulating with the sternum separately
Seven upper ribs
join cartilage of rib above
8th, 9th and 10th ribs
have free anterior ends so are floating
11th and 12th ribs
upper seven pairs ribs
True ribs
lower five pairs
False ribs
upper seven pairs
Vertebrosternal
8th, 9th, and 10th pairs
Vertebrochondral
11th and 12th pairs
Vertebral ribs
flat plates of cartilages similar in shape to the adjacent similar in shape to the adjacent rib
Costal cartilages
curved formed by the anterior margins of the 7th, 8th, 9th and 10th costal cartilages on each side and the rounded tip of the xiphoid process
Costal arch
joints of head of ribs and vertebral bodies
Costovertebral joints – synovial joints
except for 11th and 12th rib
Costotransverse joints – synovial joints
The movements of the ____ increase the anteroposterior and lateral diameters of chest at inspiration, while the _____ increases the vertical diameter
ribs,
descent of the diaphragm
located at the anterior, or sternal, end of a rib and the adjacent costal cartilage
Costochondral joints
type of joints Sternocostal or costosternal joints
sliding synovial joints (except the 1st which is cartilaginous)
Formed by the sternal (anterior) end of a costal cartilage articulating with a costal notch on the lateral margin of the sternum (upper 7)
Sternocostal or costosternal joints – sliding synovial joints (except the 1st which is cartilaginous)
located between adjacent anterior margins of the 7th, 8th, 9th and 10th costal cartilages and the rib cartilage above each one
Interchondral joints
Between the sternal end of the clavicle and clavicular notch of the sternum
Sternoclavicular joints – gliding joints
Between the inferior margin of the manubrium and the upper margin of the body of the sternum, at the sternal angle
Manubriosternal joint – cartilaginous joint
Located between the inferior end of the body of the sternum and the xiphoid process of the sternum
Xiphesternal or xiphosternal joint – cartilaginous joint
an extra rib may be present on one or both sides above the first rib
Cervical ribs
short extra rib that may be present below the 12th rib
Lumbar ribs
one or more ribs may be absent on one or both sides
Absence of ribs
the anterior or sternal end of a rib may divide into two parts
Forked ribs
the sternum may be depressed so that it lies closer to the thoracic vertebrae than usual
Pectus excavatum
prominent sternum may be present
Pigeon chest