IV – Oblique Head

Publisher Summary This chapter illustrates the anatomic section of oblique head. The zygomatico-orbital canal transmits a branch of the zygomatic nerve from the orbit to the malar eminence. The infraorbital canal has been seen. The incisive canal has been seen. The incisive foramen is formed by the conjunction of the incisive canals. The incisive foramen is the lower aperture of the two incisive canals. The incisive canals arise on each side of the nasal septum at the junction of the premaxilla and postmaxilla. The incisive canals and incisive foramen transmit the terminations of the sphenopalatine arteries, which anastomose with the terminal branches of the greater palatine artery. The infraorbital artery arises from the internal maxillary artery and passes through the pterygopalatine fossa and then forward along with the infraorbital nerve to the infraorbital groove and canal. The inferior alveolar nerve, a sensory branch of the mandibular nerve, supplies sensory innervation to the lower teeth and gums. The inferior alveolar artery arises from the internal maxillary artery medial to the neck of the mandibular condyle. The inferior orbital fissure separates the floor of the orbit from the lateral wall of the orbit in its posterior two-thirds. This is the widest section of the inferior orbital fissure. The inferior orbital fissure is much wider on its anterior end than it is on its middle or posterior end; the center is its narrowest portion. The inferior orbital fissure is bounded by the greater wing of the sphenoid laterally and by the orbital plate of the maxilla medially.