![]() ![]() The perpendicular plate of the ethmoid extends inferiorly and forms the superior part of the nasal septum. Fliss, and Ziv Gil Core Messages Tumors of the nasal cavity and paranasal sinuses account for only 3 of all head and neck tumors, and ethmoid tumors are found in 20 to 30 of all paranasal malignancies. The dura mater anchors the brain to the cranial floor at this point of attachment. 15 Ethmoid and Anterior Skull Base Neoplasms Gilad Horowitz, Dan M. The reason behind it is that some students grab the skull by putting fingers in orbits and applying some pressure over. By the way, it is the most fragile bone in our body made almost entirely by thin bony lamellae. The crista galli projects superiorly from the midline of the cribriform plate. An ethmoid bone is a very particular bone localized between eyeballs and making a significant part of the nasal cavity. Thats because the top of this bone has something called cribriform plates that. Note that this plate contains many tiny holes called olfactory foramina through which olfactory nerves pass from smell receptors in the nose to the brain. Ethmoid bone (1) Ethmoid comes from a word that means sieve or strainer. The superior surface of the ethmoid bone forming the roof of the nasal cavity is called the cribriform plate. Immediately anterior to the sphenoid bone is the ethmoid bone, which forms the roof of the nasal cavity and a portion of the partition (nasal septum) dividing the nasal cavity into the right and left sides. The optic nerves from the eyes pass through these foramina. Notice the two optic foramina in the sphenoid bone just anterior to the sella turcica. The frontal bone consists of six main parts: the squamous part, nasal part, two orbital plates and two zygomatic plates. ![]() Lateral to the sella turcica are the butterfly-shaped greater wings of the sphenoid bone. The frontal bone is a shell-shaped, unpaired, flat bone of the skull located in the forehead region. Just superior and anterior to the sella turcica are the lesser wings of the sphenoid. The superior surface of the sphenoid bone contains a saddle-like depression called the sella turcica that encloses the pituitary gland. The sphenoid contains three pairs of processes: the greater wings, lesser wings, and the pterygoid processes. ![]()
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