Infra temporal fossa (ITF) is a difficult area to access both in anatomical dissection and surgery. Thorough knowledge on the anatomy of infra temporal fossa is a prerequisite for maxillofacial, ENT and neurosurgeons since it is in close relation with oral & nasal cavities, maxillary antrum, orbit & pharynx and has direct access to skull base & cranial cavity. Moreover it is a difficult area to describe because of lack of well defined boundary. It contains mandibular nerve (MN), maxillary artery (MA), otic ganglion, chorda tympani nerve and venous plexus apart from pterygoid muscles for mastication. Some variations of the structures in the fossa were noted during routine dissection. This study focuses on such variations of the Inferior Alveolar Nerve and its relation with the maxillary artery in the infra temporal fossa. Present study was done in 60 ITF from 30 cadavers. Variations were observed in 9 specimens – 2 bilaterally, 3 on right side and 2 on left side – in connection with their mode of origin and communication with other nerves. Variations were also observed in their length, thickness and relation with MA. A peculiar branching pattern of MA has been described. Possible embryological basis of such variations has been discussed.

BACKGROUND: Lateral ventricle is the CSF lled cavity inside the cerebrum. Atrium, the meeting point of the body of lateral ventricle, its posterior horn and inferior horn, can be demonstrated radiologically in foetus as early as 12 weeks. Ventriculomegaly is often seen associated with structural anomalies of foetus. It is the earliest ultrasonographic indicator capable of detecting trivial changes in ventricular dilatation in the foetal brain. The study was done in 175 antenatal ultrasound scans of gestational ageMETHOD: ranging between 13 and 40 weeks. The measurements were taken from the axial images directly from the screen by the Sonologist. Atrial width (AW), Cerebro Atrial distance (CAD) and Hemispheric width (HSW) were also measured. Two ratios were calculated AW/CAD & AW/HSW. These values were correlated with Gestational Age (GA), Foetal weight(FW) and Biparietal diameter (BPD) were also evaluated for right left asymmetry. AW was found to be fairly constant throughout intra uterine life, unaffected by GA, FW or BPD. Its mean value was 6.8 ±RESULTS: 1.4mm. No signicant difference between right and left sides was observed. The value that increased across GA was CAD & HSW which indicated the increasing thickness of the cerebral tissue.