In the "flat back"1 postural alignment, the cervical spine is slightly extended, the upper thoracic spine is in flexion, the lower thoracic straight, the lumber straight (flexed) and the pelvis is posteriorly tilted. Bibliography item kendall not found. See Muscles: Testing and Function, with Posture and Pain by Kendall, et al.
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In this postural alignment the neck is slightly extended, the upper back is in slight flexion, and the lower back is in slight extension.
What follows is a brief over-view of normal or "ideal" postural alignment. It should not be considered to encompass all the structural variations that can exist, but may still be considered normal and having not arisen from aquired postural distortions.
The slightly extended inward curve of the neck (cervical spine) and lower back (lumbar spine) is referred to as lordotic.
In this way a normal slightly arched position of the neck and lumbar in a position of lordosis.
However, this term is generally meant to mean a hyper-extended or over-arched position.
Continue Reading » Ideal Postural Alignment (Normal Posture)