An intraoperative clinical photograph documenting an anatomical variation of the recurrent laryngeal nerve (RLN) during a thyroid surgery. The image shows the surgical field with the following landmarks labeled: the thyroid gland (T) medially retracted, the thyroid cartilage (TC) in the superior-lateral aspect, and the point of typical nerve entry (N). The recurrent laryngeal nerve (RLN) is visualized following an atypical trajectory, ascending along the medial margin of the superior thyroid pole and terminating beneath the superior cornu of the thyroid cartilage. This clinical case illustrates an anatomical variant that can lead to surgical complications if not properly identified. The surgical site displays typical tissue characteristics including erythematous vascularized structures and surgical retraction tools. This image serves as an educational resource for endocrine surgeons and medical students to understand neurovascular anatomy and the importance of intraoperative nerve monitoring in preventing iatrogenic vocal cord paralysis.

An intraoperative clinical photograph depicting the surgical anatomy of the left central neck compartment during thyroid surgery. The image highlights the anatomical relationship between the left inferior laryngeal nerve (ILN), also known as the recurrent laryngeal nerve, and the inferior thyroid artery (ITA). The photograph demonstrates a Type 4 variation, where the terminal division of the ILN into anterior (*) and posterior (**) branches occurs at the pre-arterial segment, proximal to its crossing with the ITA. The left lobe of the thyroid gland is visible in the upper portion of the surgical field. This visual is significant for endocrine surgery, illustrating extralaryngeal terminal bifurcation of the ILN, which is a critical landmark to identify to prevent iatrogenic nerve injury during thyroidectomy or parathyroidectomy. The image provides educational value regarding neurovascular variations and surgical risk regions in the cervical course of the laryngeal nerves.

This magnified clinical operative photograph demonstrates the surgical anatomy of the left central neck compartment during thyroid surgery. The image highlights the variations in the course of the left recurrent laryngeal nerve (RLN) and its neurovascular relationships. The main trunk of the left RLN is visible in the lower quadrant, ascending and bifurcating into distinct anterior and posterior terminal branches. Medial to these branches, the inferior thyroid artery is identified, crossing the nerve path. A significant anatomical variation shown is the SILAB (Supra-Arterial Inferior Laryngeal Anastomotic Branch), a horizontal nerve anastomosis connecting the posterior branch of the RLN to adjacent neural structures near the laryngeal entry point. This photograph serves as an educational resource for identifying vulnerable neural structures during thyroidectomy and parathyroidectomy, emphasizing the clinical importance of meticulous dissection at the neurovascular crossing point to avoid iatrogenic nerve injury.

This diagnostic ultrasound image presents two side-by-side transverse views of the larynx at the level of the thyroid cartilage, demonstrating the functional anatomy of the vocal cords. The left frame illustrates vocal cord abduction, while the right frame shows vocal cord adduction. Key anatomical structures are labeled: the superficially located sternocleidomastoid muscles (Sm), the arch of the thyroid cartilage (Tc), the hypoechoic vocalis muscle (Vm), the hyperechoic vocalis ligament (VL), and the posteriorly situated arytenoid cartilages (Ac). In the abduction view, the arytenoid cartilages and vocal folds are positioned apart, creating an open glottic space. In the adduction view, the arytenoid cartilages move medially, bringing the hyperechoic vocal ligaments together at the midline. Small clinical inset photographs show the transverse transducer placement on the anterior neck over the thyroid cartilage. This comparison is used in clinical education to teach airway ultrasonography, specifically for assessing vocal cord mobility and verifying Laryngeal Mask Airway (LMA) or endotracheal tube positioning.

Side-by-side diagnostic ultrasound images demonstrating the laryngeal anatomy using a lateral vertical procedure. The images specifically focus on the visualization of the muscular process (MP) of the arytenoid cartilage to assess vocal cord dynamics. Panel (a) shows the larynx during abduction; at the white arrow, the muscular process is not visible as it has rotated out of the imaging plane. Panel (b) shows the larynx during adduction; the white arrow points to a distinct, hyperechoic structure representing the visible muscular process of the arytenoid cartilage. Surrounding soft tissue structures include the thyroarytenoid and lateral cricoarytenoid muscles. This imaging technique is utilized in otolaryngology to evaluate vocal cord movement and diagnose conditions such as vocal cord paresis or paralysis by observing the presence or absence of rhythmic arytenoid cartilage displacement. The lateral approach bypasses laryngeal air interference and thyroid cartilage calcification common in traditional transverse views.