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In anatomy, the round window and oval window are also known as the fenestra rotunda and the fenestra ovalis. [3] In microanatomy, fenestrae are found in endothelium of fenestrated capillaries, enabling the rapid exchange of molecules between the blood and surrounding tissue. [4] The elastic layer of the tunica intima is a fenestrated membrane.
The infratemporal fenestra, also called the lateral temporal fenestra or lower temporal fenestra, is the lower of the two and is exposed primarily in lateral (side) view. Temporal fenestrae in relation to the other skull openings in the dinosaur Massospondylus , a type of diapsid .
The antorbital fenestra in relation to the other skull openings in the dinosaur Massospondylus. An antorbital fenestra (plural: fenestrae) is an opening in the skull that is in front of the eye sockets. This skull character is largely associated with archosauriforms, first appearing during the Triassic Period.
The round window is situated below (inferior to) and a little behind (posterior to) the oval window, from which it is separated by a rounded elevation, the promontory.. It is located at the bottom of a funnel-shaped depression (the round window niche) and, in the macerated bone, opens into the cochlea of the internal ear; in the fresh state it is closed by a membrane, the secondary tympanic ...
The oval window (or fenestra vestibuli or fenestra ovalis) is a connective tissue membrane-covered opening from the middle ear to the cochlea of the inner ear.. Vibrations that contact the tympanic membrane travel through the three ossicles and into the inner ear.
This schematic shows the skull viewed from the left side. The middle opening is the orbit of the eye; the opening to the right of it is the temporal fenestra. Synapsids evolved a temporal fenestra behind each eye orbit on the lateral surface of the skull. It may have provided new attachment sites for jaw muscles.
The antorbital fenestra lies within a larger depression, the antorbital fossa. This fossa can contain additional, smaller openings, namely the maxillary fenestra (also: accessory antorbital fenestra) and the promaxillary fenestra. [1] articular The articular is the hindmost bone of the lower jaw.
In some rodents, the subsquamosal fenestra is an opening between two parts of the squamosal bone, at the back of the skull. It can be seen in lateral view. It can be seen in lateral view. Most Oryzomyini have the fenestra, but some species, including those in the genera Nectomys , Sigmodontomys , and Melanomys among others, lack it.