What is the anterior posterior diameter?
Distance from the front to the back of the chest (anterior-posterior diameter) less than the size of the chest from side to side (transverse diameter) Normal chest shape, with no visible deformities, such as a barrel chest, kyphosis, or scoliosis.
What is the meaning of AP diameter?
The anteroposterior (AP) diameter of the normal adult male cervical canal has a mean value of 17-18 mm at vertebral levels C3-5. In hyperextension, the cervical cord increases in diameter. Within the canal, the anterior roots are pinched between the annulus margins and spondylitic bony bars.
What is normal AP transverse diameter?
Result: The normal ratio of the anteroposterior and transverse diameter of the chest wall should be in the ratio 5:7 in humans for the proper maintenance of normal respiration.
What is anterior and posterior?
Anterior and Posterior Anterior refers to the ‘front’, and posterior refers to the ‘back’. Putting this in context, the heart is posterior to the sternum because it lies behind it. Equally, the sternum is anterior to the heart because it lies in front of it.
What does AP mean on MRI?
To compare patients body constitutions the anterior-posterior (AP) and the transverse diameters were measured as done previously (Fig.
What is increased anterior posterior diameter?
Barrel chest refers to an increase in the anterior posterior diameter of the chest wall resembling the shape of a barrel, most often associated with emphysema.
Does AP diameter increase with age?
STRUCTURAL CHANGES IN THE LUNG Studies of the aging lung have shown changes in shape, with increase in anteroposterior diameter that lead to a “rounding” shape of the lung.
How do you find the AP diameter?
diameter measurements were taken from the left to right lateral skin surfaces measuring the widest diameter of the slice. AP diameter measure- ments were taken vertically from anterior to pos- terior skin surfaces dividing the section symmetrically into right and left halves (Figure 1).
What is increased AP diameter?
Increased AP diameter occurs with lung hyperinflation from COPD , cystic fibrosis, or with advanced age.
What does AP diameter mean?
AP diameter is the linear distance perpendicular to the long axis of the limb and oriented along the AP axis. The percent growth of AP diameter was +48% in 17-20 wks (p <0.
What is the AP diameter?
The AP diameter of the normal lumbar spinal canal varies widely from 15 to 27 mm. Lumbar stenosis results from an AP spinal canal diameter of less than 12 mm in some patients; a diameter of 10 mm is definitely stenotic and may be a primary source of symptoms.