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The ethmoid bone (/ ˈ ɛ θ m ɔɪ d /; [1] [2] from Ancient Greek: ἡθμός, romanized: hēthmós, lit. 'sieve') is an unpaired bone in the skull that separates the nasal cavity from the brain. It is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction.
Middle cranial fossa. Interpeduncular fossa; Posterior cranial fossa; Hypophyseal fossa; Temporal bone fossa Mandibular fossa; Jugular fossa; Infratemporal fossa; Pterygopalatine fossa; Pterygoid fossa; Lacrimal fossa. Fossa for lacrimal gland; Fossa for lacrimal sac; Scaphoid fossa; Condyloid fossa; Rhomboid fossa; In the mandible: Retromolar ...
A fossa (from the Latin "fossa", ditch or trench) is a depression or hollow, usually in a bone, such as the hypophyseal fossa, the depression in the sphenoid bone. [15] A meatus is a short canal that opens to another part of the body. [16] An example is the external auditory meatus. A fovea (Latin: pit) is a small pit, usually on the head of a ...
A cat's skin has the same color as the fur, but the color of the nose leather is probably dictated by a dedicated gene. Cats with white fur have skin susceptible to damage by ultraviolet light, which may cause cancer. Extra care is required when outside in the hot sun. [8]
A cranial fossa is formed by the floor of the cranial cavity. There are three distinct cranial fossae: [1] Anterior cranial fossa (fossa cranii anterior), housing the projecting frontal lobes of the brain [2] Middle cranial fossa (fossa cranii media), separated from the posterior fossa by the clivus and the petrous crest housing the temporal ...
Anatomical terms of bone [ edit on Wikidata ] The chiasmatic groove ( chiasmatic sulcus , optic groove , prechiasmatic sulcus ) is a transverse [ 1 ] groove upon the superior aspect of the body of sphenoid bone [ 1 ] [ 2 ] : 509 within the middle cranial fossa .
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The superior surface of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove), above and behind which lies the optic chiasma; the groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery (with accompanying ...