This diagnostic image is an axial Computed Tomography (CT) scan of the temporal bone, showcasing the detailed anatomy of the human auditory apparatus with color-coded contours. The visual demonstrates the spatial relationships between key middle and inner ear structures. The Eustachian tube (ET) is contoured in pink, positioned anteriorly. The tympanic cavity (TC), representing the air-filled middle ear space, is outlined in white. Posterior to these lies the inner ear complex, including the coiled cochlea (C) in blue and the vestibular apparatus (VS) in light blue. The internal auditory canal (IAC), which transmits the vestibulocochlear and facial nerves, is highlighted in green extending medially. Occupying the posterior and lateral aspect is the mastoid antrum and air cell system (Mastoid), outlined in red. This anatomical diagram serves as an educational tool for identifying critical landmarks in otology and radiology, often utilized for pre-operative planning or assessing radiation dose distribution in oncological treatments involving the head and neck.

This figure provides a comprehensive overview of the right nasal cavity's internal anatomy through a schematic diagram and endoscopic photographs. Image (a) is an anatomical diagram in the sagittal plane, labeling the superior, middle, and inferior turbinates, and the opening of the Eustachian tube. An asterisk identifies the root of the middle turbinate as a site for biopsy. Images (b) and (c) are clinical endoscopic photographs (rhinoscopy) showing the internal mucosal environment. The mucosa appears healthy, erythematous, and moist. Image (b) shows the endoscopic view during the tissue sampling process, with an arrow indicating the middle turbinate. Image (c) shows the same anatomical site one month post-biopsy, demonstrating successful tissue healing and mucosal regeneration at the donor site. These visuals illustrate the clinical approach to obtaining olfactory mucosa samples for research or stem cell isolation while highlighting the anatomical landmarks and the subsequent healing process in otolaryngology.

This anatomical diagram and medical illustration depicts the cartilaginous portion of the human Eustachian tube during a balloon tuboplasty procedure. A metallic, silver-colored cylindrical balloon catheter with a tapered tip and a dark longitudinal marker is shown positioned within the tubular lumen. The surrounding cartilaginous walls are rendered in a deep reddish-brown, appearing dilated to accommodate the inflated device. The image demonstrates the procedural mechanism for treating Eustachian tube dysfunction, where high-pressure inflation (typically 10 bars) is used to mechanically widen the nasopharyngeal orifice and cartilaginous canal. This educational visual is intended for Otolaryngology (ENT) trainees to understand the minimally invasive approach of balloon eustachian tuboplasty (BET) and the spatial relationship between the catheter and the anatomical landmarks of the parapharyngeal space.