What are the boundaries of orbit?
The superior orbital fissure is bounded by the lesser and greater wings of the sphenoid. The greater wing of the sphenoid, the maxilla, and the palatine bones of the orbit form the boundaries of the inferior orbital fissure. The optic canal is at the apex of the orbit and lies within the sphenoid bone.
What is the structure of the orbit?
The orbits are symmetrical paired structures separated by the nasal cavity and paranasal sinuses. Seven bones form each orbit: frontal, sphenoid, maxillary, zygomatic, palatine, ethmoid, and lacrimal. The orbital roof is formed by the lesser wing of the sphenoid bone and the frontal bone.
What shape are the bones of the orbit?
The orbit is a pear shape, with the optic nerve at the stem, and holds approximately 30 cc volume. The entrance to the globe anteriorly is approximately 35 mm high and 45 mm wide. The depth from orbital rim to the orbital apex measures 40 to 45 mm in adults.
What is the orbit of the eye?
The orbit is the bony cavity in the skull that houses the globe of the eye (eyeball), the muscles that move the eye (the extraocular muscles), the lacrimal gland, and the blood vessels and nerves required to supply these structures.
What are the shapes of the orbitals in chemistry?
Of the four, s and p orbitals are considered because these orbitals are of most common in organic and biological chemistry. An s-orbital is spherical with the nucleus at its centre, a p-orbitals is dumbbell-shaped and four of the five d orbitals are cloverleaf shaped. The fifth d orbital is shaped like an elongated dumbbell with a doughnut
What is the function of the base of the orbit?
The base of the orbit is called the orbital margin or orbital rim. Its function is to protect the contents of the orbit and to provide an attachment site for the orbital septum. The margin has a quadrangular shape, with the following borders: Supra-orbital margin – the frontal bone
What do the orbits of the planets look like?
For the planets, the orbits are almost circular. The orbits of comets have a different shape. They are highly eccentric or “squashed.” They look more like thin ellipses than circles.
Is the orbit of the Planet Circular or elliptical?
The orbits of the planets look spectacularly circular, and they are, more or less. But they’re not. So, this brings us to the point where we re-examine some things that we once learned. The orbits of planets are, strictly speaking, ellipses. This is a transcript from the video series Understanding the Misconceptions of Science.
