plexus

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Related to cystic plexus: Choroid plexus papilloma

plexus

 [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.

plex·us

, pl.

plex·us

,

plex·us·es

(plek'sŭs, -sŭs-ez), [TA] Avoid the incorrect plural plexi.
A network or interjoining, often complex, of nerves, blood vessels, or lymphatic vessels.
[L. a braid]

plexus

/plex·us/ (plek´sus) pl. plex´us, plexuses   [L.] a network or tangle, chiefly of vessels or nerves.plex´al
aortic plexus, abdominal  one composed of fibers that arise from the celiac and superior mesenteric plexuses and descend along the aorta. Receiving branches from the lumbar splanchnic nerves, it becomes the superior hypogastric plexus below the bifurcation of the aorta. Branches are distributed along the adjacent branches of the aorta.
aortic plexus, thoracic  one around the thoracic aorta formed by filaments from the sympathetic trunks and vagus nerves, and from which fine twigs accompany branches of the aorta; continuous below with the celiac plexus and the abdominal aortic plexus.
autonomic plexus  any of the extensive networks of nerve fibers and cell bodies associated with the autonomic nervous system; found particularly in the thorax, abdomen, and pelvis, and containing sympathetic, parasympathetic, and visceral afferent fibers.
Batson's plexus  the vertebral plexus (1) considered as a whole system.
brachial plexus  a nerve plexus originating from the anterior branches of the last four cervical and the first thoracic spinal nerves, giving off many of the principal nerves of the shoulder, chest, and arms.
Enlarge picture
Brachial plexus. Anterior view, showing the most major branches.
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.
carotid plexus  any of three nerve plexuses surrounding the common, external, and internal carotid arteries, particularly the last.
cavernous plexus  a plexus of sympathetic nerve fibers related to the cavernous sinus of the dura mater.
celiac plexus 
1. a network of ganglia and nerves lying in front of the aorta behind the stomach, supplying the abdominal viscera.
2. a network of lymphatic vessels, the superior mesenteric lymph nodes, and the celiac lymph nodes.
cervical plexus  a nerve plexus formed by the anterior branches of the first four cervical nerves, supplying structures in the neck region.
choroid plexuses  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 anterior branches of the coccygeal and fifth sacral nerves and by a communication from the fourth sacral nerve, giving off the anococcygeal nerve.
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.
enteric plexus  a plexus of autonomic nerve fibers within the wall of the digestive tube, made up of the submucosal, myenteric, and subserosal plexuses.
esophageal plexus  a plexus surrounding the esophagus, formed by branches of the left and right vagi and sympathetic trunks and containing also visceral afferent fibers from the esophagus.
Exner's plexus  superficial tangential fibers in the molecular layer of the cerebral cortex.
gastric plexuses  subdivisions of the celiac portions of the prevertebral plexuses, accompanying the gastric arteries and branches and supplying nerve fibers to the stomach.
Heller's plexus  an arterial network in the submucosa of the intestine.
hemorrhoidal plexus  rectal p.
hypogastric plexus, inferior  the plexus formed on each side anterior to the lower part of the sacrum, formed by the junction of the hypogastric and pelvic splanchnic nerves; branches are given off to the pelvic organs.
hypogastric plexus, superior  the downward continuation of the abdominal aortic plexus; it lies in front of the upper part of the sacrum, just below the bifurcation of the aorta, receives fibers from the lower lumbar splanchnic nerves, and divides into right and left hypogastric nerves.
lumbar plexus 
1. one formed by the anterior branches of the second to fifth lumbar nerves in the psoas major muscle (the branches of the first lumbar nerve often are included).
2. a lymphatic plexus in the lumbar region.
Enlarge picture
Lumbar plexus, in yellow, in anterior (A) and lateral (B) views, with the divisions forming the lumbosacral trunk shown in white, as is the sacral plexus.
lumbosacral plexus  the lumbar and sacral plexuses considered together, because of their continuous nature.
Meissner's plexus  submucosal p.
mesenteric plexus, inferior  a subdivision of the abdominal aortic plexus accompanying the inferior mesenteric artery.
mesenteric plexus, superior  a subdivision of the celiac plexus accompanying the superior mesenteric artery.
myenteric plexus  that part of the enteric plexus within the tunica muscularis.
pampiniform plexus 
1. a plexus of veins from the testicle and epididymis, constituting part of the spermatic cord.
2. a plexus of ovarian veins in the broad ligament.
pelvic plexus  inferior hypogastric p.
pharyngeal plexus 
1. a venous plexus posterolateral to the pharynx, formed by the pharyngeal veins, communicating with the pterygoid venous plexus, and draining into the internal jugular vein.
2. one formed chiefly by fibers from branches of the vagus nerves, but also by fibers from the glossopharyngeal nerves and sympathetic trunks, and supplying most of the muscles and mucosa of the pharynx and soft palate.
phrenic plexus  a nerve plexus accompanying the inferior phrenic artery to the diaphragm and adrenal glands.
prevertebral plexuses  autonomic nerve plexuses situated in the thorax, abdomen, and pelvis, anterior to the vertebral column; they consist of visceral afferent fibers, preganglionic parasympathetic fibers, preganglionic and postganglionic sympathetic fibers, and ganglia containing sympathetic ganglion cells, and they give rise to postganglionic fibers.
prostatic plexus 
1. a subdivision of the inferior hypogastric plexus that supplies nerve fibers to the prostate and adjacent organs.
2. a venous plexus around the prostate gland, receiving the deep dorsal vein of the penis and draining through the vesical plexus and the prostatic veins.
pterygoid plexus  a network of veins corresponding to the second and third parts of the maxillary artery; situated on the medial and lateral pterygoid muscles and draining into the facial vein.
pulmonary plexus  one formed by several strong trunks of the vagus nerve that are joined at the root of the lung by branches from the sympathetic trunk and cardiac plexus; it is often divided into anterior and posterior parts.
rectal plexus 
1. a venous plexus that surrounds the lower part of the rectum and drains into the rectal veins.
2. any of the rectal nerve plexuses (inferior, middle, or superior).
rectal plexus, external  inferior rectal p. (1).
rectal plexus, inferior 
1. the subcutaneous portion of the rectal venous plexus, below the pectinate line.
2. a nerve plexus accompanying the inferior rectal artery, derived chiefly from the inferior rectal nerve.
rectal plexus, internal  superior rectal p. (1).
rectal plexus, middle  a subdivision of the inferior hypogastric plexus, in proximity with and supplying nerve fibers to the rectum.
rectal plexus, superior 
1. the submucosal portion of the rectal venous plexus, above the pectinate line.
2. a nerve plexus accompanying the superior rectal artery to the rectum, derived from the inferior mesenteric and hypogastric plexuses.
sacral plexus 
1. one arising from the anterior branches of the last two lumbar and the first four sacral nerves.
Enlarge picture
Plexus sacralis (sacral plexus), in yellow, in anterior (A) and lateral (B) views. The lumbar plexus is shown in white.
2. a venous plexus on the pelvic surface of the sacrum, receiving the sacral intervertebral veins.
solar plexus  celiac p. (1).
submucosal plexus  the part of the enteric plexus that is situated in the submucosa.
subserosal plexus  the part of the enteric plexus situated deep to the serosal surface of the tunica serosa.
tympanic plexus  a network of nerve fibers supplying the mucous lining of the tympanum, mastoid air cells, and pharyngotympanic tube.
uterine plexus 
1. the part of the uterovaginal plexus that supplies nerve fibers to the cervix and lower part of the uterus.
2. the venous plexus around the uterus, draining into the internal iliac veins by way of the uterine veins.
uterovaginal plexus 
1. the subdivision of the inferior hypogastric plexus that supplies nerve fibers to the uterus, ovary, vagina, urethra, and erectile tissue of the vestibule.
2. the uterine and vaginal venous plexuses considered together.
vaginal plexus 
1. the part of the uterovaginal plexus that supplies nerve fibers to the walls of the vagina.
2. a venous plexus in the walls of the vagina, which drains into the internal iliac veins by way of the internal pudendal veins.
vascular plexus 
1. a network of intercommunicating blood vessels.
2. a plexus of peripheral nerves through which blood vessels receive innervation.
venous plexus  a network of interconnecting veins.
vertebral plexus 
1. a plexus of veins related to the vertebral column.
2. a nerve plexus accompanying the vertebral artery, carrying sympathetic fibers to the posterior cranial fossa via cranial nerves.
vesical plexus 
1. the subdivision of the inferior hypogastric plexus that supplies sympathetic nerve fibers to the urinary bladder and parts of the ureter, ductus deferens, and seminal vesicle.
2. a venous plexus surrounding the upper part of the urethra and the neck of the bladder, communicating with the vaginal plexus in the female and with the prostatic plexus in the male.

plexus

(plĕk′səs)
n. pl. plexus or plex·uses
1. A structure in the form of a network, especially of nerves, blood vessels, or lymphatics: the cardiac plexus; the pelvic plexus.
2. A combination of interlaced parts; a network.

plexus

[plek′səs] pl. plexuses
Etymology: L, braided
a network of intersecting nerves and blood vessels or of lymphatic vessels. The body contains many plexuses, such as the brachial plexus, the cardiac plexus, the cervical plexus, and the solar plexus.

plexus

A network of interlaced nerves or vessels. See Brachial plexus, Cervical plexus, Hemorrhoidal plexus, Lumbar plexus, Myenteric plexus, Sacral plexus, Submucous plexus.

plex·us

, pl. plexus (plek'sŭs) [TA]
A network or interjoining of nerves and blood vessels or of lymphatic vessels.
[L. a braid]

plexus

Any interlacing network, as of nerves, blood or lymph vessels. The solar plexus is a network of AUTONOMIC nerve fibres lying on the abdominal AORTA.

plexus

a network of interlaced blood vessels or nerves.

plexus 

A network of interweaving nerves, blood vessels or lymphatic vessels.
cavernous plexus A network of nerve fibres derived from the internal carotid nerve and located on the inferomedial aspect of the internal carotid artery in the cavernous sinus. It supplies sympathetic innervation via the ciliary and gasserian ganglia to almost all of the orbit, including fibres to the dilator pupillae muscle, Müller's superior palpebral muscle, the ciliary muscle and vasoconstrictor fibres for the blood vessels of the eye. See Horner's syndrome.
ciliary venous plexus A network of vessels situated in the outer portion of the ciliary body. It receives blood from the ciliary muscle and drains into anterior ciliary vein. It also communicates with the intrascleral venous plexus. Syn. ciliary plexus.
deep episcleral plexus See pericorneal plexus.
episcleral venous plexus A network of vessels near the limbus which receives blood from the intrascleral plexus and canal of Schlemm via collector channels and drains into the anterior ciliary veins. It also receives blood from the conjunctival veins and drains the perilimbal conjunctiva.
internal carotid plexus A network of nerve fibres derived from the internal carotid nerve and located on the lateral side of the internal carotid artery near the apex of the petrous bone. It sends sympathetic axons to the abducens, ophthalmic and nasociliary nerves, the deep petrosal nerve, the caroticotympanic nerve and the ophthalmic and lacrimal arteries. See superior cervical ganglion.
intrascleral venous plexus A network of vessels situated in the deep layers of the sclera near the limbus. It is made up of the deep and mid scleral plexuses. It receives aqueous humour from the canal of Schlemm via collector channels, as well as blood from the ciliary venous plexus. It drains into the anterior ciliary veins.
pericorneal plexus A network of vessels situated around the limbus and formed by the anastomosing of the episcleral arteries (branches of the anterior ciliary arteries) and the conjunctival arteries. It forms a series of arcades parallel to the corneal margin. This plexus is arranged in two layers: (1) a superficial conjunctival pericorneal plexus liable to injection in inflammation of the superficial cornea or conjunctiva (conjunctival injection) (2) a deep episcleral plexus liable to injection in diseases of the iris, ciliary body or deep portion of the cornea, or angle-closure glaucoma (ciliary injection). See ciliary arteries; anterior ciliary vein.

plex·us

, pl. plexus (plek'sŭs) [TA]
A network or interjoining of nerves and blood vessels or of lymphatic vessels.
[L. a braid]

plexus (plek´sus),

n a network or tangle, especially of nerves, lymphatics, or veins.
plexus, Haller's,
n.pr a nerve plexus of sympathetic filaments and branches of the external laryngeal nerve on the surface of the inferior constrictor muscle of the larynx.
plexus, intermediate,
n a middle zone of the periodontal ligament situated between the cemental group of fibers attached to the root of the tooth and the alveolar group of fibers attached to the alveolar bone (Sharpey's fibers). The three groups of fibers are woven together by small, thick strands of collagen fibers. The interweaving of fiber bundles of the intermediate plexus allows for tooth eruption and tooth movement between the cemental and alveolar periodontal fibers.

plexus

pl. plexus, plexuses [L.] a network or tangle, chiefly of veins or nerves.

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
a plexus of autonomic fibers and sympathetic nerve ganglia which surround the origin of the celiac artery, and supply the abdominal viscera.
celiacomesenteric plexus
a plexus of autonomic nerve fibers and sympathetic ganglia around the origin of the celiac and cranial mesenteric arteries; called also solar plexus.
cervical plexus
a network of nerve fibers formed by the first four cervical nerves and supplying the structures in the region of the neck.
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 last sacral nerves.
coronary plexus
a venous plexus within the coronet of the hoof.
cutaneous p's
superficial, middle and deep, inter-communicating plexuses of blood vessels are identified as supplying blood to haired skin.
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.
gonadal plexus
the collection of parasympathetic and sympathetic nerves to the gonads.
hoof plexus
plexus of veins draining the hoof region in the horse.
lumbar plexus
see lumbar plexus.
lumbosacral plexus
see lumbosacral plexus.
mesenteric plexus
parasympathetic and sympathetic nerve supply to the abdominal organs.
myenteric plexus
nerve plexus
a plexus composed of intermingled nerve fibers.
pampiniform plexus
1. a plexus of veins from the testis and the epididymis, constituting part of the spermatic cord.
2. a plexus of ovarian veins in the broad ligament of the uterus.
parametrial plexus
the venous plexus within the broad ligament providing venous drainage to the uterus and vagina.
plexus papilloma
see plexus papilloma.
pulmonary plexus
the array of autonomic nerves which supply the lungs.
renal plexus
autonomic nerve supply to the kidney.
sacral plexus
a plexus arising from the ventral branches of the last few lumbar and first few sacral spinal nerves.
solar plexus
see celiacomesenteric plexus (above).
tympanic plexus
a network of nerve fibers supplying the mucous lining of the tympanum and auditory tube.