| internal thoracic plexus | An autonomic plexus on the internal thoracic artery derived from the subclavian plexus. Synonym: internal mammary plexus, plexus mammarius internus. (05 Mar 2000) |
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| intracavernous plexus | <anatomy> The portion of the internal carotid plexus in the cavernous sinus. Synonym: plexus cavernosus, Walther's plexus. (05 Mar 2000) |
| intraparotid plexus of facial nerve | <anatomy, nerve> The diverging branches of the facial nerve passing through the substance of the parotid gland, connected by numerous looped anastomoses. Synonym: plexus intraparotideus, pes anserinus. (05 Mar 2000) |
| ischiadic plexus | Formed by the fourth and fifth lumbar (lumbosacral trunk) and first, second, and third sacral nerves; it lies on the inner surface of the posterior wall of the pelvis usually embedded in the piriformis muscle; its nerves supply the lower limbs, its major product being the sciatic nerve. Synonym: plexus sacralis, ischiadic plexus, sciatic plexus. (05 Mar 2000) |
| occipital plexus | An autonomic plexus on the occipital artery derived from the external carotid plexus. Synonym: plexus occipitalis. (05 Mar 2000) |
| oesophageal plexus | One of two nervous plexus's, posterior and anterior on the walls of the oesophagus; the first is formed by branches from the right vagus and left recurrent, the second by the anastomosing trunks of the vagus after leaving the pulmonary plexus's; branches supply the mucous and muscular coats of the oesophagus. Synonym: plexus oesophageus, plexus gulae. (05 Mar 2000) |
| ophthalmic plexus | An autonomic plexus, entering the orbit in company with the ophthalmic artery, derived from the internal carotid plexus. Synonym: plexus ophthalmicus. (05 Mar 2000) |
| ovarian plexus | An autonomic plexus derived from the aortic plexus and accompanying the ovarian artery to the ovary, broad ligament, and uterine tube. Synonym: plexus ovaricus. (05 Mar 2000) |
| testicular plexus | The autonomic plexus derived from the aortic plexus and accompanying the testicular artery. Synonym: plexus testicularis, spermatic plexus. (05 Mar 2000) |
| thoracic aortic plexus | An autonomic plexus surrounding the thoracic aorta and passing with it through the aortic opening in the diaphragm, to become continuous with the abdominal aortic plexus. Synonym: plexus aorticus thoracicus. (05 Mar 2000) |
| enteric plexus | The autonomic plexus in the wall of the intestine; it consists of three parts, submucosal, myenteric, and subserosal; ganglionic cells are scattered through the myenteric and submucosal plexus. Synonym: plexus entericus. (05 Mar 2000) |
| trunci plexus brachialis | The superior, middle, and inferior trunks; they divide distally to form the cords (fasciculi) of the plexus. Synonym: trunci plexus brachialis. (05 Mar 2000) |
| truncus inferior plexus brachialis | The nerve bundle formed by the union of the ventral rami of the eighth cervical and first thoracic nerves; it provides fibres to the posterior and medial cords (fasciculi) of the brachial plexus. Synonym: truncus inferior plexus brachialis. (05 Mar 2000) |
| truncus medius plexus brachialis | The continuation of the ventral ramus of the seventh cervical nerve; it contributes fibres to the posterior and lateral cords (fasciculi) of the brachial plexus. Synonym: truncus medius plexus brachialis. (05 Mar 2000) |
| trunks of brachial plexus | The superior, middle, and inferior trunks; they divide distally to form the cords (fasciculi) of the plexus. Synonym: trunci plexus brachialis. (05 Mar 2000) |