Full Ball & Socket Joint Description. [Continued from above] . . . In the shoulder joint, the spherical head of the humerus (upper arm bone) fits into the glenoid cavity of the scapula (shoulder blade). The glenoid cavity is a small and shallow cavity that permits the shoulder joint the greatest range of motion in the human body.
Lumbar lordosis refers to the inward curvature of the spine just above the buttocks. The National Institutes of Health reports that lordosis is caused by spondylolisthesis. Spondylolisthesis is a condition in which a spinal bone slips out of its normal space and onto the bone below it.
Straightening of the normal cervical lordosis; Loss of cervical lordosis; Straightening of the cervical lordosis; Your neck, upper back, and low back all have counterbalanced curves. One goes one way, and the adjoining curve goes the opposite way. When the curve points toward the front, itâs called a lordosis and toward the back, itâs called a kyphosis.