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anteroposterior diameter

   Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
diameter /di·am·e·ter/ (di-am´ĕ-ter) the length of a straight line passing through the center of a circle and connecting opposite points on its circumference. Symbol d.
anteroposterior diameter  the distance between two points located on the anterior and posterior aspects, respectively, of the structure being measured, such as the true conjugate diameter of the pelvis or occipitofrontal diameter of the skull.
Baudelocque's diameter  external conjugate d.; see pelvic d.
conjugate diameter  see pelvic d.
cranial diameters  distances measured between certain landmarks of the skull, such as biparietal, that between the two parietal eminences; bitemporal, that between the two extremities of the coronal suture; cervicobregmatic, that between the center of the anterior fontanel and the junction of the neck with the floor of the mouth; frontomental, that between the forehead and chin; occipitofrontal, that between the external occipital protuberance and most prominent midpoint of the frontal bone; occipitomental, that between the external occipital protuberance and the most prominent midpoint of the chin; suboccipitobregmatic, that between the lowest posterior point of the occiput and the center of the anterior fontanel.
pelvic diameter  any diameter of the pelvis, such as diagonal conjugate, joining the posterior surface of the pubis to the tip of the sacral promontory; external conjugate, joining the depression under the last lumbar spine to the upper margin of the pubis; true (internal) conjugate, the anteroposterior diameter of the pelvic inlet, measured from the upper margin of the pubic symphysis to the sacrovertebral angle; oblique, joining one sacroiliac articulation to the iliopubic eminence of the other side; transverse (of inlet), joining the two most widely separated points of the pelvic inlet; transverse (of outlet), joining the medial surfaces of the ischial tuberosities.
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Diameters of pelvic inlet (see also pelvic planes ).

anteroposterior diameter
n.
See conjugate.


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? Mentioned in ? References in periodicals archive
 
The mass was approximately 5 cm wide, and its anteroposterior diameter was 2.
[5] As ventilatory demands increase, these muscles contract to lift the sternum and increase the anteroposterior diameter of the upper rib cage during inspiration.
This socket, as suggested by its name, is four-sided with an increased mediolateral diameter and decreased anteroposterior diameter.
 
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