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Natural head position is a reproducible position of a head when it is in an upright position, with eyes looking straight at a mark. [1] The concept was introduced into the field of orthodontics in the late 1950s by Moorrees and Kean. [2]
Registration of the head in its natural position while obtaining a cephalogram has the advantage that an extracranial line (the true vertical or a line perpendicular to that) can be used as a reference line for cephalometric analysis, thus bypassing the difficulties imposed by the biologic variation of intracranial reference lines.
Supine position: lying on the back with the face up; Prone position: lying on the chest with the face down ("lying down" or "going prone") Lying on either side, with the body straight or bent/curled forward or backward; Fetal position: is lying or sitting curled, with limbs close to the torso and the head close to the knees
This position is convenient for the caregiver because it permits them more access to the perineum. The position has been largely popular in the US and other Western countries over the last two centuries, though cross-culturally and historically, it is very rare (about 18%) for people to assume a prone or dorsal position during childbirth.
The standard anatomical position, or standard anatomical model, is the scientifically agreed upon reference position for anatomical location terms. Standard anatomical positions are used to standardise the position of appendages of animals with respect to the main body of the organism. In medical disciplines, all references to a location on or ...
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In obstetrics, a cephalic presentation or head presentation or head-first presentation is a situation at childbirth where the fetus is in a longitudinal lie and the head enters the pelvis first; the most common form of cephalic presentation is the vertex presentation, where the occiput is the leading part (the part that first enters the birth canal). [1]
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