Dissection of 32 bodies of Macacus cyclopsis was done and the following were obtained for the facial veins.
I. The veins of the face are received by V. facialis and V. retromandibularis.
II. V. facialis passes beneath the pars orbitalis M. orbitalis oculi, M. levator labii superioris alaeque nase, M. malaris and Platysma and runs toward the mandibular angle. It then courses backward between the mandibula and the glandula submandibularis and in most cases enters the V. jugularis externa either directly of after joining with the V. retromandibularis at the height of slightly below the middle of the external side of M. sternocleidomastoideus. The veins received by V. facialis are as follows.
1. Most usually there is one V. supratrochlearis on each side which follow a symmetrical course (87.5%), but there are cases in which there is a single vessel which bifurcates at the root of the nose or cases in which both of the preceeding two forms are present simultaneously while in other cases it is absent.
2. V. supraorbitalis is always present.
3. V. angularis is always present.
4. Vv. nasales externae arise in the venous network on the bridge of the nose. The veins anastomose and form several vessels, two in most cases (53.1%), which. run upward to enter the V. angularis.
5. V. labialis superior which is unaccompanied by an artery consists of two vessels in most cases (70.3%).
6. V. faciei profunda was noted in almost all cases (98.4%) and opens into the V. facialis generally immediately below the point of crossing of the Ductus parotideus and V. facialis (92.2%).
7. V. buccalis was noted in the greater majority of cases (98.4%).
8. Vv. massetericae anterior are always present.
9. Vv. labiales inferiores were always present. In very rare cases, they anastomosed with the V. labialis superior.
10. R. comm. v. temp. med. was present in a l most all cases (96.8%). There were cases in which its presence could not be recognized.
III. V. retromandibularis descends in the substance of the parotid gland to the lower edge of the parotid gland. It enters the V. jugularis externa either directly or after joining with the V. facialis at slightly below the middle of the M. sternocleidomastoideus.
Veins received by the V. retromandibularis are as follows:
1. V. auriculoccipitalis is always found and in the majority of cases it enters the V. retromandibularis in the lower portion of the parotid gland.
2. V v. temporales superficiales become a single vessel and unite with V. temporalis media after which it enters the V. temporalis communis.
3. V. temporalis media is a single vessel and is present in all cases.
4. V. auricularis anterior is always present.
5. V. temporalis communis is always present.
6. V. transversa faciei most frequently enters, so-called, the Conf. v. preaur. (98.4%) and anteriorly usually anastomoses with V. comitantes ductus parotidei (53.8%) or V. facialis (28.6%).
7. Vv. articulares mandibulae are always pres e nt and enter V. transversa faciei.
8. Vv. c omitantes ductus parotidei run backward along the parotid duct and chiefly join V. temporalis communis (98.4%). Anteriorly, they primarily anastomose with V. facialis (53.3%).
9. Vv. massetericae posterior consist of one or two vessels and are present in all cases.
10. Vv. parotideae consist of 3 or 4 vessels and are never absent.
11. A vein corresponding to the Conf. v. preaur. in man (of Mochizuki) is recognized but in Macacns cyclopsis V. facialis do es not contribute to its formation.
IV. The state of union between V. facialis, V. retromandibularis and V. jugularis externa may be classified into 4 types but in the greatest number of cases V. facialis and V. retromandibularis unite and in addition form a large external jugular venous loop (46.9%).
Also, in a small number of cases the anterior and posterior branches of the external jugular venous loop formed further small loops.
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