lumbar plexus

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Related to lumbar plexus: sciatic nerve, lumbar plexus block


 [plek´sus] (pl. plex´us, plexuses) (L.)
a network or tangle, chiefly of veins or nerves; see also rete. adj., adj plex´al.
plexus basila´ris a venous plexus of the dura mater located over the basilar part of the occipital bone and the posterior part of the body of the sphenoid bone, extending from the cavernous sinus to the foramen magnum.
brachial plexus see brachial plexus.
cardiac plexus the plexus around the base of the heart, chiefly in the epicardium, formed by cardiac branches from the vagus nerves and the sympathetic trunks and ganglia, and made up of sympathetic, parasympathetic, and visceral afferent fibers that innervate the heart.
carotid p's nerve plexuses surrounding the common, external, and internal carotid arteries.
celiac plexus solar plexus.
cervical plexus a nerve plexus formed by the ventral branches of the first four cervical spinal nerves and supplying the structures in the region of the neck. One important branch is the phrenic nerve, which supplies the diaphragm.
choroid plexus infoldings of blood vessels of the pia mater covered by a thin coat of ependymal cells that form tufted projections into the third, fourth, and lateral ventricles of the brain; they secrete the cerebrospinal fluid.
coccygeal plexus a nerve plexus formed by the ventral branches of the coccygeal and fifth sacral nerve and by a communication from the fourth sacral nerve, giving off the anococcygeal nerves.
cystic plexus a nerve plexus near the gallbladder.
dental plexus either of two plexuses (inferior and superior) of nerve fibers, one from the inferior alveolar nerve, situated around the roots of the lower teeth, and the other from the superior alveolar nerve, situated around the roots of the upper teeth.
lumbar plexus one formed by the ventral branches of the second to fifth lumbar nerves in the psoas major muscle (the branches of the first lumbar nerve often are included).
lumbosacral plexus the lumbar and sacral plexuses considered together, because of their continuous nature.
lymphatic plexus an interconnecting network of lymph vessels that provides drainage of lymph in a one-way flow. An example is the lymphocapillary vessels, collecting vessels, and trunks.
myenteric plexus a nerve plexus situated in the muscular layers of the intestines.
nerve plexus a plexus composed of intermingled nerve fibers.
pampiniform plexus
1. in the male, a plexus of veins from the testis and the epididymis, constituting part of the spermatic cord.
2. in the female, a plexus of ovarian veins draining the ovary.
sacral plexus a plexus arising from the ventral branches of the last two lumbar and first four sacral spinal nerves.
solar plexus see solar plexus.
tympanic plexus a network of nerve fibers supplying the mucous lining of the tympanum, mastoid air cells, and pharyngotympanic tube.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lum·bar plex·us

(lŭm'bahr plek'sŭs)
1. A nervous plexus, formed by the ventral rami of the first four lumbar nerves; it lies in the substance of the psoas muscle.
2. A lymphatic plexus formed of about twenty lymph nodes and connecting vessels situated along the lower portion of the aorta and the common iliac vessels.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In a landmark study, Winnie AP, Ramamurthy S, Durrani [5] described the anatomy of the lumbar plexus. They found that the lumbar plexus is sandwiched between the psoas major muscle and the ilacus muscles.
Merman, "Quadratus lumborum block as an alternative to lumbar plexus block for hip surgery: a report of 2 cases," A&A Case Reports, vol.
No dose-finding studies have been conducted for the SSPS technique, but the minimal effective anesthetic volume of 0.5% ropivacaine to accomplish a successful Shamrock lumbar plexus blockade in 95% of patients (ED95) is 36.0 mL (95% CI 19.7 to 52.2) [36].
Opioid-free analgesia following total knee arthroplasty--a multimodal approach using continuous lumbar plexus (psoas compartment) block, acetaminophen, and ketorolac.
Posterior lumbar plexus block, anatomy, approach and techniques, Reg Anaesth Pain Med 2005; 30: 143-9.
Marino et al (23) divided 225 patients undergoing total hip arthroplasty into three groups: continuous FNB, lumbar plexus nerve block and systemic opioid.
The femoral nerve is the largest branch of the lumbar plexus. It is formed within the psoas major muscle, descends posterolaterally through the pelvis lateral to the femoral artery and vein, and then branches into terminal nerves that supply musculoskeletal structures that allow for thigh flexion, abduction, and lateral rotation from the hip joint.
Regional anaesthesia is usually divided into either central (epidural, spinal and caudal anaesthesia), or peripheral nerve blocks (lumbar plexus, brachial, intercostal nerve).
(24,25) The presence of a CDP indicates conduction of sensory nerve action potentials through the brachial or lumbar plexus to the spinal cord.
Brachial plexitis and myelitis and herpes-zoster lumbar plexus disorder in patient treated with infliximab.
It must be ensured that psoas was parted between the middle and anterior third of the muscle, guaranteeing that lumbar plexus was posteriorly located and outside operative corridor.