| small vein | <anatomy, vein> A vein in which the three tunics are poorly defined and thin; longitudinal elastic networks occur and the smooth muscle of the media, which is circularly arranged, may be incomplete or in one or two layers. (05 Mar 2000) |
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| spermatic vein | <anatomy, vein> See: right testicular vein, left testicular vein. (05 Mar 2000) |
| spiral vein of modiolus | The vein running a spiral course in the modiolus of the cochlea; it is tributary to both the labyrinthine vein and the vein of the cochlear canaliculus. Synonym: vena spiralis modioli. (05 Mar 2000) |
| splenic vein | <anatomy, vein> Vein formed by the union (at the hilus of the spleen) of several small veins from the stomach, pancreas, spleen and mesentery. (12 Dec 1998) |
| nasofrontal vein | <anatomy, vein> The vein located in the anterior medial part of the orbit that connects the superior ophthalmic vein with the angular vein. Synonym: vena nasofrontalis. (05 Mar 2000) |
| sternocleidomastoid vein | <anatomy, vein> It arises in the sternocleidomastoid muscle and accompanies the sternocleidomastoid branch of the occipital artery; it drains into the internal jugular or superior thyroid vein. Synonym: vena sternocleidomastoidea. (05 Mar 2000) |
| stylomastoid vein | <anatomy, vein> It drains the tympanic cavity, traverses the facial canal exiting via the stylomastoid foramen, and empties into the retromandibular vein. Synonym: vena stylomastoidea. (05 Mar 2000) |
| subclavian vein | <anatomy, vein> The continuation of the axillary vein which follows the subclavian artery and then joins the internal jugular vein to form the brachiocephalic vein. (12 Dec 1998) |
| sublingual vein | <anatomy, vein> Vein which accompanies the sublingual artery in the floor of the mouth, lateral to the hypoglossal nerve; it may join the deep lingual vein to form the lingual vein, or join the vena comitans nerve hypoglossi. Synonym: vena sublingualis. (05 Mar 2000) |
| submental vein | <anatomy, vein> A vein situated below the chin, anastomosing with the sublingual vein, connecting with the anterior jugular vein, and emptying into the facial vein. Synonym: vena submentalis. (05 Mar 2000) |
| sulcus of umbilical vein | <anatomy, vein> The sulcus on the foetal liver occupied by the umbilical vein. Synonym: sulcus venae umbilicalis. (05 Mar 2000) |
| superficial circumflex iliac vein | <anatomy, vein> Corresponding to the artery of the same name, emptying usually into the great saphenous vein, or sometimes into the femoral vein. Synonym: vena circumflexa iliaca superficialis. (05 Mar 2000) |
| superficial epigastric vein | <anatomy, vein> Drains the lower and medial part of the anterior abdominal wall and empties into the great saphenous vein. Synonym: vena epigastrica superficialis. (05 Mar 2000) |
| superficial middle cerebral vein | <anatomy, vein> A large vein passing along the line of the sylvian fissure to join the cavernous sinus; it communicates with the superior sagittal sinus and transverse sinus via the superior and inferior anastomotic veins, respectively. Synonym: vena cerebri media superficialis. (05 Mar 2000) |
| superficial vein | <anatomy, vein> One of a number of veins that course in the subcutaneous tissue and empty into deep veins; they form prominent systems of vessels in the limbs and are usually not accompanied by arteries. Synonym: vena cutanea, cutaneous vein. (05 Mar 2000) |