| plexus iliacus externus | A lymphatic plexus formed by the lymph nodes along the external iliac artery on either side, and their afferent and efferent vessels. Synonym: plexus iliacus externus. (05 Mar 2000) |
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| plexus inguinalis | A lymphatic plexus formed of 10 to 15 lymph nodes with their connecting vessels lying superficially near the termination of the great saphenous vein and more deeply along the femoral artery and vein. See: superficial inguinal lymph nodes. Synonym: plexus inguinalis. (05 Mar 2000) |
| plexus intermesentericus | The part of the aortic plexus lying between the superior and inferior mesenteric plexus's. Synonym: plexus intermesentericus. (05 Mar 2000) |
| plexus intraparotideus | <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) |
| plexus jugularis | A lymphatic plexus which includes the deep cervical group of lymph nodes, with their afferent and efferent vessels, extending along the internal jugular vein. (carotid sheath). Synonym: plexus jugularis. (05 Mar 2000) |
| plexus lienalis | An alternate term for splenic plexus. (05 Mar 2000) |
| plexus lingualis | An autonomic plexus on the artery of this name, derived from the external carotid plexus. Synonym: plexus lingualis. (05 Mar 2000) |
| plexus lumbalis | A nervous plexus, formed by the ventral rami of the first four lumbar nerves; it lies in the substance of the psoas muscle, 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. Synonym: plexus lumbalis. (05 Mar 2000) |
| plexus lumbosacralis | The lumbar and sacral plexuses taken together. The fibres of the lumbosacral plexus originate in the lumbar and upper sacral spinal cord (l1 to s3) and innervate the lower extremities. (12 Dec 1998) |
| plexus lymphaticus | A plexus of lymphatic capillaries, usually without valves, that opens into one or more larger lymphatic vessels. Synonym: plexus lymphaticus. (05 Mar 2000) |
| plexus mammarius | A lymphatic plexus, including the parasternal; (internal thoracic) lymph nodes, with their vessels, situated along the course of the internal thoracic veins. Synonym: mammary plexus, plexus mammarius. (05 Mar 2000) |
| plexus mammarius internus | An autonomic plexus on the internal thoracic artery derived from the subclavian plexus. Synonym: internal mammary plexus, plexus mammarius internus. (05 Mar 2000) |
| plexus maxillaris externus | An autonomic plexus on the facial artery derived from the external carotid plexus; it sends a branch to the submandibular ganglion. Synonym: external maxillary plexus, plexus maxillaris externus. (05 Mar 2000) |
| plexus maxillaris internus | <anatomy, artery> An autonomic plexus on the maxillary artery derived from the external carotid plexus. Synonym: internal maxillary plexus, maxillary plexus, plexus maxillaris internus. (05 Mar 2000) |
| plexus meningeus | A nerve plexus on the cerebral meninges, derived from the external carotid plexus. Synonym: plexus meningeus. (05 Mar 2000) |