Anatomical terms of bone The lesser wings of the sphenoid or orbito-sphenoids are two thin triangular plates, which arise from the upper and anterior parts of the body, and, projecting lateralward, end in sharp points [Fig. 1]. In some animals they remain as separate bones called orbitosphenoids.
What is the literal meaning of wings?
1 : one of the paired movable feathered or membranous parts with which a bird, bat, or insect flies. 2 : something like a wing in appearance, use, or motion the wings of an airplane. 3 : a part (as of a building) that sticks out from the main part.
Where is the lesser wing in the skull?
sphenoid bone
The lesser wing of the sphenoid bone, or orbito-sphenoid, is a sharp, pointed triangular plate arising laterally from the upper anterior portion of the sphenoid body.
What does the inferior surface of the lesser wings forms?
The inferior surface of the lesser wing forms the posterior part of the roof of each orbit and the exposed surface of the greater wing forms a large part of the lateral wall of the orbit, the floor of the middle fossa, and the roof of the infratemporal fossa.
What are the greater and lesser wings of the sphenoid bone?
This view presents the midline body and paired greater and lesser wings of the sphenoid. The body and lesser wings form the anterior boundary of the middle cranial fossa, while the greater wings and squamous portions of the temporal bones form the lateral margins.
What is hypophyseal fossa?
The pituitary fossa (hypophyseal fossa) is an indentation in the roof of the body of the sphenoid bone in the middle cranial fossa.
What is aerodynamic wing?
A wing is a type of fin that produces lift while moving through air or some other fluid. Accordingly, wings have streamlined cross-sections that are subject to aerodynamic forces and act as airfoils. A wing’s aerodynamic efficiency is expressed as its lift-to-drag ratio.
What is Aircraft wing?
wing, in aeronautics, an airfoil that helps lift a heavier-than-air craft. When positioned above the fuselage (high wings), wings provide an unrestricted view below and good lateral stability. Placed below the fuselage, low wings reduce the height of the undercarriage and simplify engine maintenance.
What is the function of the lesser wing of the sphenoid bone?
Rising from the front of the body of the sphenoid bone and moving off to the sides, the two paired lesser wings are triangular in shape. Their lower borders help make up part of the orbits (which house the eyes), while the upper surface makes up a portion of the cranial cavity, which houses parts of the brain.
What is ethmoid bone?
The ethmoid bone is an unpaired cranial bone that is a significant component of the upper nasal cavity and the nasal septum. The ethmoid bone also constitutes the medial orbit wall.
Which foramen is found in lesser wing of sphenoid bone?
The optic foramen perforates the base of the lesser wing at its attachment to the body of the sphenoid. This transmits the optic nerve and ophthalmic artery, which traverse the lesser wing through the optic canal.
What is the greater wing of sphenoid bone?
alisphenoid
The greater wing of the sphenoid bone, or alisphenoid, is a bony process of the sphenoid bone; there is one on each side, extending from the side of the body of the sphenoid and curving upward, laterally, and backward.
What is the difference between lesser wings and superior wings?
The lesser wings arise superolaterally from the sphenoid body where they form the optic canal (→ optic nerve, ophthalmic artery). The inferior surface participates in the lateral margin of the orbit while the superior surface forms part of the cranial cavity.
Where do the lesser wings of the eye come from?
Lesser wings. The lesser wings arise superolaterally from the sphenoid body where they form the optic canal (→ optic nerve, ophthalmic artery). The inferior surface participates in the lateral margin of the orbit while the superior surface forms part of the cranial cavity.
What is the medial end of the lesser wing called?
The medial end of the lesser wing attaches to the body by means of two pedicles, thus forming the optic canal. The wing itself forms the superior margin of the supraorbital fissure. Synonym (s): ala minor ossis sphenoidalis [TA] . Giovanni F., Italian anatomist, 1510-1580.
What are the lesser wings of the sphenoid?
The lesser wings of the sphenoid or orbito-sphenoids are two thin triangular plates, which arise from the upper and anterior parts of the body, and, projecting lateralward, end in sharp points [Fig. 1].
