Internal carotid plexus

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Nerve: Internal carotid plexus

Sympathetic connections of the ciliary and superior cervical ganglia. (Carotid plexus visible center top.)

Diagram of the cervical sympathetic. (Carotid plexus visible center top.)
Latin	plexus caroticus internus
Gray's	p.977

Scheme showing sympathetic and parasympathetic innervation of the pupil and sites of lesion in a Horner's syndrome.

The internal carotid plexus (carotid plexus) is situated on the lateral side of the internal carotid artery, and in the plexus there occasionally exists a small gangliform swelling, the carotid ganglion, on the under surface of the artery.

Postganglionic sympathetic fibres ascend from the superior cervical ganglion, along the walls of the internal carotid artery, to enter the internal carotid plexus. These fibres then distribute to deep structures, which include the Superior Tarsal Muscle and pupillary dilator muscles.^[1] Some of the fibres from the internal carotid plexus converge to form the deep petrosal nerve.^[2]

The internal carotid plexus communicates with the trigeminal ganglion, the abducent nerve, and the pterygopalatine ganglion (also named sphenopalatine); it distributes filaments to the wall of the carotid artery, and also communicates with the tympanic branch of the glossopharyngeal nerve.

Additional images

Nerves of the orbit, and the ciliary ganglion. Side view.
Pathways in the Ciliary Ganglion.

This article incorporates text from a public domain edition of Gray's Anatomy.

Nerves – autonomic nervous system (sympathetic nervous system/ganglion/trunks and parasympathetic nervous system/ganglion) (TA A14.3, GA 9.968)

Head/
cranial

Sympathetic	Ciliary ganglion: roots Sensory Sympathetic Short ciliary

Parasympathetic	Ciliary ganglion: roots Sensory Parasympathetic Short ciliary Pterygopalatine ganglion: deep petrosal nerve of pterygoid canal branches of distribution: greater palatine inferior posterior nasal branches lesser palatine nasopalatine medial superior posterior nasal branches pharyngeal Submandibular ganglion Otic ganglion

Neck/
cervical

Sympathetic	paravertebral ganglia: Cervical ganglia Superior Middle Inferior Stellate ganglion prevertebral plexus: Cavernous plexus Internal carotid

Chest/
thorax

Sympathetic	paravertebral ganglia: Thoracic ganglia prevertebral plexus: Cardiac plexus Esophageal plexus Pulmonary plexus Thoracic aortic plexus splanchnic nerves: cardiopulmonary thoracic cardiac nerves: Superior Middle Inferior

Abdomen/
Lumbar

Sympathetic	paravertebral ganglia: Lumbar ganglia prevertebral ganglia: Celiac ganglia Aorticorenal Superior mesenteric ganglion Inferior mesenteric ganglion prevertebral plexus: Celiac plexus Hepatic Splenic Pancreatic aorticorenal Abdominal aortic plexus Renal/Suprarenal Superior mesenteric Gastric Inferior mesenteric Spermatic Ovarian Superior hypogastric hypogastric nerve Superior rectal Inferior hypogastric Vesical Prostatic / Cavernous nerves of penis Uterovaginal Middle rectal splanchnic nerves: Lumbar splanchnic nerves

Enteric	Meissner's plexus Auerbach's plexus

Pelvis/
sacral

Sympathetic	paravertebral ganglia: Sacral ganglia Ganglion impar splanchnic nerves: Sacral splanchnic nerves

Parasympathetic	splanchnic nerves: Pelvic splanchnic nerves

M: PNS

anat (h/r/t/c/b/l/s/a)/phys (r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug (N1B)

References

↑ Hal Blumenfeld, "Neuroanatomy through Clinical Cases", Sinauer Associates, 2002, p543
↑ Richard L. Drake, Wayne Vogel & Adam W M Mitchell, "Gray's Anatomy for Students", Elsevier inc., 2005

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