Anatomical structures involving muscles and nerves in the gluteal region are important as any variations of Sciatic nerve (SN) and its surrounding muscles like piriformis muscle (PM) can lead to entrapment or compression of this nerve causing sciatica and piriformis syndrome. To find out variations in the gluteal region related to piriformis muscle and the nerves surrounding it. The study was done on 20 embalmed cadavers (total 40 gluteal regions) during routine cadaveric dissection. The anatomical relations of the piriformis and surrounding nerves i.e. sciatic nerve, its divisions and gluteal nerves were studied. The dissection was done on 40 gluteal regions. In 36 gluteal regions (90%) the sciatic nerve emerged below the piriformis as a single trunk. While in 4 gluteal regions (10%) there was a higher division of sciatic nerve. In one cadaver we observed an accessory piriformis muscle just inferior to the main piriformis muscle. The sciatic nerve was also dividing higher up into common peroneal nerve and tibial nerve in the gluteal region. The common peroneal nerve (CPN) was observed emerging between the main and the accessory piriformis muscle. Along with it the inferior gluteal nerves were also seen traversing between the main and the accessory piriformis muscle.Knowledge of anatomical variations in the gluteal region is important to explain the myalgia and neuropathies in this region. This knowledge is also important in performing hip surgeries and giving intramuscular injections in the gluteal region.
Introduction: The creation and maintenance of uninterrupted Haemodialysis (HD) is dependent on the quality and reliability of vascular access. The native Radio-cephalic Arteriovenous Fistula (RCAVF) is the vascular access of choice for HD in patients with end stage renal diseases. A thorough understanding of the vascular anatomy is critical in selecting the site for the RCAVF that provides the flow rates necessary for the development of an optimal outflow vein. The widespread use of the doppler ultrasound has facilitated the identification of vessels that are suitable for fistula construction. Aim: To analyse the surgical anatomy of radial artery and cephalic vein in the front of forearm and dorsum of hand, pertinent to RCAVF planning. Materials and Methods: A cross-sectional cadaveric of 30 formalin preserved upper limbs specimens of adult human cadavers was done in the Department of Anatomy, Hamdard Institute of Medical Sciences, New Delhi, India, (n=22 limbs) from August 2016 to April 2018 and Government Institute of Medical Sciences, Greater Noida, Uttar Pradesh, India (n=8 limbs) from November 2018 to November 2019. The external diameter of radial artery, cephalic vein and distance between radial artery and cephalic vein were measured at mid forearm, front of wrist and Anatomical Snuff Box (ASB). Measurements were taken with sliding vernier caliper to an accuracy of 0.01 mm. All the measurements were tabulated separately for right and left-side. The data was analysed using Microsoft excel. Descriptive statistics like mean, standard deviation (SD) and range were evaluated for all the parameters collected. The paired t-test was applied to compare the right and left-side measurements. Results: Amongst 30 formalin preserved specimens of upper limbs of human cadavers analysed, the diameter of radial artery was 3±0.26 mm on the right-side and 2.87±0.24 mm on the left- side and of cephalic vein was 2.5±0.59 mm on the right-side and 2.9±0.33 mm in ASB. The distance between radial artery and cephalic vein were 2.5 ±0.59 mm on the right-side and 2.9±0.33 mm on the left-side which was minimum in ASB. The distance between radial artery and cephalic vein was maximum at wrist (4.02±0.76 mm and 4.2±0.71 mm on the right and left hand). Conclusion: The fistula formation in ASB may give better results as the radial artery and cephalic vein are closer as compared to wrist and midforearm with reasonable diameter. Additionally, it would also provide long segment of vein for arterialization.
: The placenta is a chorioallantoic, deciduate, haemochorial and villous organ. It is a vital organ which transfers vital nutrients from the mother to the foetus and removes waste products from the foetus to the mother. There has been paucity of literature regarding the morphometric study of human placenta and its vascular pattern (magisterial or dispersed) by corrosion cast technique. Therefore, the present study was conducted on morphometry and vascular pattern of the human placentae.: To do the morphological and morphometric study of placenta and to study the vascular pattern of placenta by corrosion cast technique. Study was done on 43 placentae and its morphometric study and vascular pattern were studied by corrosion cast technique.: Oval was the most common shape of placenta observed in the present study. Out of 43 placentae, 22(51.16%) had oval, 16(37.20%) placentae had round shape followed by triangular in 3(6.97%) placentae. Only 1 (2.32%) placenta each found to be irregular and multilobed. Most common shape recorded in complicated pregnancy was oval followed by round. Magisterial pattern was found in 13.95% of placenta and was associated with oval shape constituting 25.58% of placentae. Mixed pattern was seen in 18.60% placentae and was associated with oval placentae(23.25%). The disperse pattern was seen in 4.65% and was associated with oval and irregular placentae each constituting(2.32%).: The vascular cast preparation of placentae in our study will further help in contribution towards the understanding of the placental vasculature. An effort should be made for performing more studies on placentae of complicated pregnancies eg: hypertension and diabetes etc.
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