lumbosacral trunk


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Related to lumbosacral trunk: lumbosacral plexus, sacral plexus, sciatic nerve

trunk

 [trungk]
1. the part of the body to which the head and limbs are attached; called also torso.
2. a larger structure, such as a vessel or nerve, from which smaller divisions or branches arise, or that is created by their union. adj., adj trun´cal.
brachiocephalic trunk truncus brachiocephalicus.
celiac trunk the arterial trunk arising from the abdominal aorta and giving origin to the left gastric, common hepatic, and splenic arteries.
encephalic trunk brainstem.
lumbosacral trunk a trunk formed by union of the lower part of ventral branch of the fourth lumbar nerve with the ventral branch of the fifth lumbar nerve.
lymphatic t's the lymphatic vessels (right or left lumbar, intestinal, right or left bronchomediastinal, right or left subclavian, and right or left jugular trunks) that drain lymph from various regions of the body into the right lymphatic or thoracic duct.
pulmonary trunk a vessel arising from the conus arteriosus of the right ventricle and bifurcating into the right and left pulmonary arteries.
sympathetic trunk two long ganglionated nerve strands, one on each side of the vertebral column, extending from the base of the skull to the coccyx.

lumbosacral trunk

A short segment of nerve that includes part of the fourth lumbar spinal nerve (L4) and all of the fifth lumbar spinal nerve (L5). The lumbar trunk combines with axons from the first two sacral spinal nerves (S1 and S2) to form the portion of the sciatic nerve that will become the common peroneal (fibular) nerve.
See also: trunk
References in periodicals archive ?
The primary outcome was proportion of subjects with motor blockade of the femoral and obturator nerves as well as the lumbosacral trunk. We hypothesized an increase in the proportion from 75% with ultrasound guidance to 100% with ultrasound/MRI fusion guidance.
The number (proportion) of subjects with motor blockade of the femoral and obturator nerves as well as the lumbosacral trunk was equal (ultrasound/MRI, 23/26 [88%]; ultrasound, 23/26 [88%]; p = 1.00).
There was no evidence for any difference in perineural spread to the anterior rami of spinal nerves L2 (ultrasound/MRI, 14/26 [54%]; ultrasound, 11/26 [42%]; p = 0.58), L3 (ultrasound/MRI, 21/26 [81%]; ultrasound, 21/26 [81%]; p = 1.00), L4 (ultrasound/MRI, 22/26 [85%]; ultrasound, 25/26 [96%]; p = 0.38), L5 (ultrasound/MRI, 10/26 [38%]; ultrasound, 18/26 [69%]; p = 0.057), and S1 (ultrasound/MRI, 5/26 [19%]; ultrasound, 8/26 [31%]; p = 0.55), the femoral (ultrasound/MRI, 16/26 [62%]; ultrasound, 13/26 [50%]; p = 0.61), obturator (ultrasound/MRI, 14/26 [73%]; ultrasound, 11/26 [85%]; p = 0.58), and lateral femoral cutaneous (ultrasound/MRI, 16/26 [62%]; ultrasound, 11/26 [42%]; p = 0.58) nerves, or the lumbosacral trunk (ultrasound/MRI, 10/26 [38%]; ultrasound, 15/26 [58%]; p = 0.58).