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Biomedical subjects

K K Bisaria

Publications and source records attributed to K K Bisaria.

At least 19 recordsLinked to original sources
PubMed1993

A variant of the floor of the carotid canal.

325 skulls were investigated in the present study. The absence of the floor of the carotid canal was found in only one skull, a condition which makes the internal carotid artery vulnerable during a surgical approach to this region.

Carotid Artery, Internal↗
PubMed1988

Cavernous portion of the trochlear nerve with special reference to its site of entrance.

In a study of 80 cavernous sinuses in 40 cadavers, the trochlear nerve entered the cavernous sinus in 87.5% of cases before the crossing, in 7.5% at the crossing and in 5.0% after the crossing of the free and the attached margins of the tentorium cerebelli. In 77.5% of specimens the trochlear nerve showed a marked bend with flattening at the site of its entrance into the cavernous sinus. The nerve ran between the superficial and deep layers of dura, partly between them, in the thickness of the deeper layer, or deep to the deep layer but adherent to it. These findings do not conform with the description of its course by other workers in the past. In 72.5% of specimens the size of the trochlear nerve was larger during its course in the cavernous sinuses but in 20.0% of specimens such an increase in thickness was noted even in the posterior cranial fossa. Only in one specimen was the trochlear nerve adherent to the ophthalmic division of the trigeminal nerve. Cases showing the trochlear nerve entering the cavernous sinus after the crossing of the two margins of tentorium cerebelli and the splitting and branching of the trochlear nerve in the cavernous sinus have not hitherto been reported.

Adult↗
PubMed1985

The superficial sylvian vein in humans: with special reference to its termination.

A study of the termination of the superficial middle cerebral vein in 140 human specimens revealed that in 80 cranial cavities (51.1%) the vein drained into both the sphenoparietal sinuses, in nine cranial cavities (6.4%) into the sphenoparietal and cavernous sinuses, and in 19 cranial cavities (13.6%) into the sphenoparietal sinuses and middle meningeal veins. In 20 cranial cavities (14.3%) the vein drained into the cavernous sinuses alone and in eight cranial cavities (5.7%) it drained into the cavernous sinuses and middle meningeal veins. In one cranial cavity (0.71%) it drained into the vein in the foramen lacerum and the sphenoparietal sinus, in one cranial cavity (0.71%) into the sphenoparietal sinus and the superior petrosal sinus, in one cranial cavity (0.71%) into the middle meningeal veins on either side, and in another cranial cavity (0.71%) into the superior sagittal sinus, a finding which has not been reported in the past. The presence of an uncal vein draining the medial surface of the temporal lobe was observed occasionally (5.7%) in this study. A part of the superficial middle cerebral vein and sphenoparietal sinus in the form of a vein running a short course between the two layers of the lateral wall of the cavernous sinus is an observation previously not reported. This should be of value to neurosurgeons in the approach to the internal carotid artery through Parkinson's triangle.

Cerebrovascular Circulation↗
PubMed1985

Anatomic variations of venous sinuses in the region of the torcular Herophili.

In this study of 110 cranial cavities from adult cadavers, the superior sagittal sinus was found to divide into two channels. In most cases, the division was associated with a dural partition. Essentially, the variations as observed in this study could be grouped into three types: Type 1 includes those specimens in which the sagittal sinus drains into one lateral sinus and the straight sinus into the other, with no connection between the two. Type 2 includes those specimens in which the superior sagittal sinuses and the straight sinus fork, and the forks from both sinuses join to form the lateral sinuses. Type 3 includes those specimens in which a confluence of sinuses exists, varying from a common pool to merely a potential confluence, depending upon the presence of pads, incomplete partitions, and complete partitions of dura mater. Rare findings previously not reported consist of double straight sinuses draining into one transverse sinus; the superior sagittal sinus dividing into three channels with two transverse sinuses on one side; a transverse sinus originating from a tentorial vein; and drainage of a tentorial vein into the confluence of sinuses.

Cranial Sinuses↗
PubMed1984

Anomalies of the posterior communicating artery and their potential clinical significance.

This study of the posterior communicating artery (PCoA) in 126 cranial cavities of adult cadavers revealed some hitherto unreported anomalies. These included: the origin of one PCoA from the ophthalmic artery inside the optic canal; the presence of three PCoA's on one side; the occurrence of two posterior cerebral arteries of different origin on one side; and the existence of junctional dilatations at both ends of a PCoA. Junctional dilatation at the commencement of the artery was seen in 6.3% of cases. More common anomalies were a fetal type of posterior cerebral artery in 31.7% and macroaneurysmal dilatation of the PCoA in 39.7% of cases. The presence of multiple arteries makes possible normal circulation in cases involving obstruction to any one of them. The junctional dilatation or dilatation of any other part of the PCoA, if pre-aneurysmal, may leak or rupture to produce subarachnoid hemorrhage. Arteries pressing on the oculomotor nerve may produce diplopia, and those compressing the optic chiasm and tracts may cause visual defects.

Adult↗
PubMed1984

Grooves on the occipital lobe of Indian brains.

The existence of a groove on the occipital lobe formed by the dural venous sinus or ridge has only rarely been described in the past. As observed in this study such grooves are either unilateral or bilateral and their incidence is very high in Indian brains.

Female↗
PubMed1984

Anatomical note. Grooves on the free edge of the dorsum sellae.

The majority of 90 human cadavers exhibited grooves on the free edge of the dorsum sellae formed by the posterior communicating arteries. In a few cases, the grooves were formed by the oculomotor nerves and still more rarely by the internal carotid arteries and the optic tracts. Such an irregular, grooved dorsum sellae may be mistaken for pathological erosion in radiographic examination. These arteries and nerves can be damaged during brainstem or occipital herniation through the foramen magnum and may also be compressed by suprasellar tumours more effectively.

Carotid Artery, Internal↗