Basisphenoid


Also found in: Medical.

Ba`si`sphe´noid


a.1.(Anat.) Of or pertaining to that part of the base of the cranium between the basioccipital and the presphenoid, which usually ossifies separately in the embryo or in the young, and becomes a part of the sphenoid in the adult.
n.1.(Anat.) The basisphenoid bone.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
A small part of the anterior end of the basisphenoid and two short fragments of a narrow parasphenoid are visible through the posterior interpterygoid vacuity; their morphology remains unclear (Figure 3B).
(1999): small size (Forearm length: 47.40 - 49.30 mm), brown dorsal pelage, belly paler than the back, tail protruding from the uropatagium at least half of its length, rostrum slightly naked, pointed muzzle, smooth lips without pronounced folds, thick ears, rounded and widely separated in the crown, inner ear keel ends up behind the posterior border of the antitragus, sagittal and lambdoid crest poorly developed, basisphenoid pits moderately deep and rounded.
For example, clival chordomas account for 0.15-1 % of all intracranial tumors (Erdem et al., 2003; Jian et al., 2011), there location varying depending on whether they are at the upper clival (basisphenoid) or lower clival (basiocciput) region (Stippler et al., 2009).
Severe trauma can result in avulsion of the longus capitis muscle from the insertion of the basisphenoid bone and moderate bleeding from the guttural pouch.
The policy said that PBRT may be medically necessary in the basisphenoid region (a bone at the base of the skull) or cervical spine.
Tumour was seen to involve the nasopharynx and sphenoid sinus, eroding the basisphenoid. Optic nerve and carotid artery were not involved.
Computed tomography angiography (CTA) revealed a 4 x 4 cm multiloculated, nasal mass of the sphenoid skull base protruding through a "central corridor" in the sphenoid intersinus septum of the basisphenoid and anterosuperior to the clivus bone (Figures 2(a) and 2(b)).
The gestational exposure to metolachlor increased (p < 0.05) the incidence of fetuses with absent xiphoid process (TA group), incomplete ossification of sternebra (TB and TC groups), increased distance between hamulus and basisphenoid, absent sternebrae and incomplete ossification of xiphoid process (TC group) (Table 2).
In our case, the key imaging feature was the osseous stalk arising from the basisphenoid portion of the clivus, which is considered a morphologic hallmark of EP and is absent in other retroclival lesions, such as dermoids, epidermoids, arachnoid cysts, and neuroenteric cysts.
The basisphenoid begins to ossify in the proximal region of basipterygoid processes and the crista sellaris (Table 2).
macrotis can be distinguished from the other members of the genus primarily by its larger size (see comparison in Kumirai and Jones, 1990), with a forearm length over 55 mm, greatest length of the skull more than 22 mm, braincase breadth usually over 9 mm, maxillary toothrow length usually less than 8.5 mm, and relatively large and deep basisphenoid pits (Kumirai and Jones, 1990; Milner et al., 1990; Eger, 2008).