An early chick embryo as learning model for study of embryology

Background: In medical education, learning happens by variety of perceptions. In basic science Anatomy, visualization of real structures gives rich learning experience. This type seems deficient in human embryology, that too in the early phases. Aim: With the basic concept of'ontogeny repeats phylogeny', for the enrichment of learning early embryology, chick embryos have been used. Materials and methods: 30 commercially available chicken eggs and 30 Gallus domesticus [country chicken] eggs collected from nearby villages were hatched for embryos to whole mount, fix and stain. Results: Successful hatching rates were more in favour of Gallus domesticus eggs [76%] compared to others [26%] Conclusion: This experiment guides the easiest and simplest possible ways to successfully establish the learning module for early embryology in departmental setup using Gallus domesticus eggs. Observation of brain swellings, heart swelling optic vesicle, nasal pit, pharyngeal clefts, neural tube, somites and limb buds, vitelline vessels provide valuable learning experience by direct interaction with the real environment. This bridges the gap of seeing what is not usually observed and strengthens educational embryology

Nasal Tip Dermoid Sinus Cyst Excision by Open Rhinoplasty Technique

Nasal dermoid sinus cysts are uncommon congenital anomalies, presenting either as cysts or sinuses with varied presentation at birth, childhood, or even adulthood. A midline nasal pit, fistula, or infected mass may be located anywhere from the glabella to the nasal columella. Preoperative radiological investigation with CT (computed tomography) and MRI (magnetic resonance imaging) scans is mandatory to rule out intracranial extension. Complete excision of the cyst along with its tract is the only definitive therapeutic modality. We present a case of nasal dermoid sinus cyst in a 3-year-old male child who underwent excision by open rhinoplasty approach.

Quantitative aspects of proliferation in the nasal epithelium of the rhesus monkey embryo

Proliferation was studied in the nasal epithelium of rhesus monkey embryos ranging in age from 26 through 41 days of gestation (stages 13–20). Labeling indices were tabulated 1 h after an intrachorionic injection with [3H]thymidine, and the distribution of labeled cells was determined at intervals ranging from 1 h to 11 h after injection. The labeling index showed a chronological decrease from 69·4% in the nasal placode at stage 13 to 31·6% in the nasal pit at stage 20. The vomeronasal epithelium was distinctive in that the basal cells lost their ability to incorporate [3H]thymidine as early as stage 18. In the remainder of the nasal epithelium, mitotic figures were initially confined to apical regions but later occurred in basal regions as the embryonic pattern of proliferation became converted to the adult type.