The objective of this work was to study the morphology and biometry of the infraorbital foramen (FIO), variations in its shape, size and number as well as to obtain measurements of its location. 60 dry skulls were analyzed. The test of Qui-quadrant and the T Test were used in measurements with a 5% significance. On the right side, the FIO was measured at a distance of 6.49(±1.68) mm from the lower, 39.65(±3) mm from the upper, 17.7(±2.97) mm from the medial and 20.46(±2.9) mm from the lateral margin of the orbit; its pear-shaped opening distance was 13.67(±2.17) mm. On the left side, the distance of the FIO to the lower margin of the orbit was 6.52(±1.82) mm; to the upper margin was 39.9(±2.62) mm and to the lateral and medial margin were 17.93(±2.58) mm and 21.12(±3) mm, respectively; its distance to the pear-shaped opening was 14.26(±1.83) mm. It was found predominately in an oval shape, in 39 (65%) of the skulls, on both sides. Accessory foramens were present in 11 samples on the right and in 15 samples on the left side. The FIO was most frequently found on the side of, or laterally to the sagittal plane that passes through the middle of the supraorbital foramen/ incisures, in 38 skulls (63.3%) on the right side and in 45 skulls (75%) on the left and middle to the zigomatic-maxillary suture, in 41 skulls (68.3%) on right and in 42 skulls (70%) on the left side, besides being most frequently found in a region between the first and second premolars, in 22 skulls (36.7%) on the right side and in 17 skulls (28.3%) on the left.303986992Berge, J.K., Bergman, R.A., Variations in size and in symmetry of foramina of the human skull (2001) Clin. Anat., 6, pp. 406-413Chen, E., (1997) Anatomia topográfica dos pontos de acupuntura., , São Paulo, RocaChonghuo, T., (1993) Tratado de Medicina Chinesa, , São Paulo, RocaChung, M.S., Kim, H.J., Kang, H.S., Chung, I.H., Locational relationship of the supraorbital notch or foramen and infraorbital and mental foramina in Koreans (1995) Acta Anat., 154, pp. 162-166Cutright, B., Quillopa, N., Schubert, W., An anthropometric analysis of the key foramina for maxillofacial surgery (2003) J. Oral Maxillofac. Surg., 61 (3), pp. 354-357Ding, L., (1996) Acupuntura, Teoria do Meridiano e Pontos de Acupuntura, , 1a ed. São Paulo, RoccaElias, M.G., Silva, R.B., Pimentel, M.L., Cardoso, V.T.S., Rivello, T., Babinski, M., Morphometric analysis of the infraorbital foramen and acessories foraminas in Brazilian skulls (2004) Int. J. Morphol., 22 (4), pp. 273-278Esper, R.S., Yamamura, Y., Cricenti, S.V., Novo, N.F., Efeitos da inserçäo perpendicular e oblíqua de agulhas no ponto de acupuntura E-2 (Sibai), no forame infra-orbital (1997) Rev. Paul. Acupunt., 3 (2), pp. 85-88Esper, R.S., Yara, J., Yamamura, Y., Cricenti, S.V., Relações anatômicas do ponto de acupuntura E-2 (Sibai) localizado no forame infra-orbital (1998) Rev. Paul. Acupunt., 4 (1), pp. 19-22Gardner, E., Gray, D.J., O'hailly, R., (1988) Anatomia: Estudo regional do corpo humano., , 4. ed. Rio de Janeiro, Guanabara KooganHindy, A.M., Abdel-Raouf, F., A study of infraorbital foramen, canal and nerve in adult Egyptians (1993) Egypt Dent. J., 39 (4), pp. 573-580Karakas, P., Bozkir, M.G., Oguz, O., Morphometric measurements from various reference points in the orbit of male Caucasians (2002) Surg. Radiol. Anat., 24 (6), pp. 358-362Kazkayasi, M., Ergin, A., Ersoy, M., Bengi, O., Tekdemir, I., Elhan, A., Certain anatomical relations and the precise morphometry of the infraorbital foramen, canal and groove: An anatomical and cephalometric study (2001) Laryngoscope, 111 (4 PART 1), pp. 609-614Lee, U.Y., Nam, S.H., Han, S.H., Choi, K.N., Kim, T.J., Morphological characteristics of the infraorbital foramen and infraorbital canal using three-dimensional models (2006) Surg. Radiol. Anat., 24, pp. 1-6Ming, S.X., Os (1996) Fundamentos da Medicina Chinesa Um Texto Abrangente para Acupunturistas e Fitoterapeutas., , São Paulo, RoccaMonroy, C., Liliana, P., Morales, M., Andrés, C., Jacome, N., Anibal, J., Cassiano, C.G., Características y variaciones anatómicas del surco, canal y foramen infraorbitario en un grupo de población colombiana (2003) Univ. odontol., 23 (52), pp. 60-68Ranali, J., Andrade, E.D., Matos Filho, T.R., Anestesia dos nervos alveolar inferior, lingual e bucal: Análise das técnicas convencionais e a de Gow-Gates (1988) Rev. Paulista de Odontologia., 5, pp. 12-16Sischer, Dubrul, (1991) Anatomia oral., , 8. ed. São Paulo, Artes MédicasSussmann, D.J., (1972) Que é a Acupuntura?, , 2aed. Rio de Janeiro, RecordTeixeira, L.M.S., Reher, P., Reher, V.G.S., (2001) Anatomia aplicada à odontologia., , Rio de Janeiro, Guanabara KooganTestut, L., Latarjet, A., (1954) Tratado de anatomía humana, , Barcelona, Salvat EditoresXinnong, C., (1999) Acupuntura e Moxibustão Chinesa, , São Paulo, Rocca