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(spi'na) plural.spinae [L. spina, thorn]
1. Any spinelike protuberance.
2. The spine.

spina bifida

Spina bifida cystica.

spina bifida cystica

A congenital defect in the walls of the spinal canal caused by a lack of union between the laminae of the vertebrae during embryonic development. The lumbar portion is the section chiefly affected. It is found in approx. 18 of every 100,000 births. Like other neural tube defects, it can be prevented with folic acid supplementation (800 mg daily) taken by women before and during pregnancy. The consequences of this defect may include urinary incontinence, saddle or limb anesthesia, gait disturbances, and structural changes in the pelvis. Synonym: rachischisis

spina bifida occulta

A failure of the vertebrae to close without hernial protrusion.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Bilateral continuous erector spinae plane block contributes to effective postoperative analgesia after major open abdominal surgery: a case report.
Erector spinae plane block provides effective pain management during pneumothorax surgery.
Local anesthetic spread during erector spinae plane block.
The transition from a lordotic lumbar posture to a fully flexed lumbar spine alters the geometry of the upper erector spinae and lumbar erector spinae, potentially reducing their ability to generate extensor torque and resist anterior shear (Figure 2).
Although increased lumbar flexion alters the geometry of the erector spinae in a way that can potentially compromise its ability to generate an extension moment and resist anterior shear, authors who have investigated back extensor torque in static lumbar postures have found increases in torque as the spine becomes more flexed.
This ability to produce considerably greater torque in a flexed lumbar posture has been attributed to increase in the length of the erector spinae (Raschke and Chaffin 1996).
The length-tension relationship of the erector spinae seems to be supported by studies that have investigated the effect of lumbar posture on the ratio of extensor torque production to levels of erector spinae muscle activation (neuromuscular efficiency ratio) (Roy et al 2003, Tan et al 1993).
The influence of lumbar posture on erector spinae muscle activation and lumbar spine kinematics during dynamic lifting and lowering
An important aspect of transitioning clients into manual handling activities is understanding the relationships between levels of erector spinae muscle activation and lumbar kinematics.
Figure 3A shows an example of a person initiating a lift with a lordotic posture (40% of maximal flexion) and the rate of change in lumbosacral angle (angular velocity) and the extent of erector spinae muscle activation.
When using a flexed lifting posture the upper erector spinae and lumbar erector spinae display quite different activation patterns.
Whilst a number of studies have focused on lumbar posture during lifting, few have investigated the effects that lumbar posture has on bending moments and erector spinae muscle activation during lowering.