![]() ![]() nasal septum the Crista Galli project superiorly from the ethmoid bone and serves as the. Unpaired bones – Frontal, vomer, and sphenoid bones. This video shows the many different parts of the human skull.Paired bones – Inferior nasal conchae, maxillae, lacrimal, palatine, and nasal bones. ![]() The ethmoid bone articulates with 5 paired and 3 unpaired bones: Muscle AttachmentĪs ethmoid bone forms a part of the orbit, it is associated with the following seven extraocular muscles: This lamina connects with the frontal bone, palatine bone, lacrimal bone, and sphenoid bone, forming the major portion of the inside wall of the eye cavity. The external edges of these labyrinths are referred to as the orbital lamina or lamina papyracea. On the other hand, the medial sheet makes up the upper lateral wall of the nasal cavity, from which the superior and middle nasal conchae descend into the nasal cavity. The orbital plate is the lateral sheet of bone that forms the orbit’s medial wall. These labyrinths also form a part of the superior and middle nasal concha.Įach labyrinth is composed of two sheets of bone – an orbital plate and a medial sheet. The number of these cells increases with age. They are made up of multiple thin-walled compartments known as ethmoidal cells, which comprise the ethmoidal sinus. The ethmoid labyrinths are large masses located on both sides of the perpendicular plate. It is a thin lamina descending from the cribriform plate, inferiorly attaching to the septal cartilage to form the superior two-thirds of the nasal septum. The plate also features a small, vertical bony projection called crista galli, where the falx cerebri (a crescent-shaped sheet of dura mater that separates the two cerebral hemispheres) is attached. It allows passage to the olfactory fibers to reach the anterior cranial fossa from the nasal cavity. ![]() The structure has derived its name from the Latin’ cribriform’, meaning ‘perforated’, as this plate has several perforations, giving it a sieve-like appearance. The ethmoid is difficult to observe since it attaches the cranium to the. It forms the roof and lateral walls of the upper nasal cavity, the upper portion. This part of the ethmoid bone lies within the frontal bone’s ethmoidal notch, forming the nasal cavity roof. In humans, the sphenoid and ethmoid bones contribute to the floor of the braincase. The ethmoid bone is located between the two orbits and at the roof of the nose. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |