Posteromedial to the foramen lacerum is the carotid canal which can be seen extending further laterally. There are numerous foramina and fissures in the central skull base and a detailed understanding of their relationships as well as the important adjacent intracranial and extracranial soft-tissue structures is crucial for skull base imaging (Figs 30.1 and 30.3). The optic canals are situated above and are separated from the superomedial margin of the superior orbital fissure by the optic strut, a bridge of bone that extends from the lower margin of the base of the anterior clinoid process to the body of the sphenoid.

It leads down into the foramen magnum and demarcates the separation of the two sides of the cerebellum.

The sphenoid forms much of the base of the central skull (see Figure 6) and also extends laterally to contribute to the sides of the skull (see Figure 3). The sphenoid bone is located in the center of the cranial base (Figures 10-3 and 10-5).3,4,5 The intimate contact of the body of the sphenoid bone with the nasal cavity below and the pituitary gland above has led to the transsphenoidal route being the operative approach of choice for most sellar tumors.

Identification of the opposite optic nerve allows identification of the optic chiasm. We are pleased to provide you with the picture named Sphenoid Bone Anatomy Superior View And Posterior View. The latter four nerves travel through the common tendon of the extraocular muscles, which extends from the optic canal across the inferior aspect of the superior orbital fissure (Fig.

We use cookies to help provide and enhance our service and tailor content and ads. 42.8. The optic canal is formed by the lesser wing of the sphenoid and transmits cranial nerve II (the optic nerve) and the ophthalmic artery. Exocranial view of the skull base. ETHMOIDAL SPINE ©www.rotelearnit.com2012. The dorsum sellae is continuous with the clivus. 2nd ed. A burr hole placed over the pterion will be located at the lateral end of the sphenoid ridge.

13-8B). Required fields are marked *. It allows the internal carotid artery to enter the skull and supply the anterior component of the circle of Willis. The optic nerve and ophthalmic artery pass through this space surrounded by a connective tissue netting. En masse lesions of the pterional third of the sphenoid ridge can be associated with relatively localized head pain and bulging of the frontal and temporal bones. Click on the tags below to find other quizzes on the same subject. We hope this picture Sphenoid Bone Anatomy Superior View And Posterior View can help you study and research. According to Magoun (1976), non-union of the presphenoid and postsphenoid will produce a slant to the eyes. From: Clinical Anatomy and Physiology of the Visual System (Third Edition), 2012. Reviewer: Group E: Most laterally placed and usually referred to as pterional meningiomas.

In this view, the foramen rotundum can be seen. The zygoma and maxilla form the anterior aspect. Sellar length, defined as the greatest anteroposterior diameter of the pituitary fossa, may occur at the level of the tuberculum sellae or below.

Primary extradural and ectopic meningiomas make up 2% of all cases.

16.8). The anterior clinoid processes are located at the medial end of the lesser wings, the middle clinoid processes are lateral to the tuberculum sellae, and the posterior clinoid processes are situated at the superolateral margin of the dorsum sellae. Sphenoid Bone.

It allows the hypoglossal nerve to leave the skull.

We hope you will use this picture in the study and helping your research. 31.25). Intraosseous strains involving the lesser wing and body may affect these structures. Sphenoid Bone. En plaque tumors are characterized by hyperostosis of the sphenoid bone and carpet-like diffuse tumor invasion (Figure 42.8A,B).

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The SOF transmits cranial nerves III, IV, V1, and VI (oculomotor, trochlear, ophthalmic, and abducens nerves), as well as the superior and inferior ophthalmic veins.

By continuing you agree to the use of cookies. Its name is from the ‘Turkish saddle’ which was used by soldiers during the times of the Ottoman Empire and was famous for having four corners. 12th ed. This is formed by the orbital surface of the frontal bone and part of the lesser wing of the sphenoid bone. Anterior to the greater wing of the sphenoid is the lesser wing of the sphenoid bone.

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