--- title: "Triangles in Thyroid Surgery" description: "ENT notes on key anatomical triangles in thyroid surgery - boundaries, contents, and clinical significance." source: "The ENT Resident" author: "Dr. Mausumi Das" canonical_url: "https://www.theentresident.com/ent-notes-lectures/triangles-in-thyroid-surgery" categories: ["Thyroid", "Mnemonics in ENT"] video: "https://www.youtube.com/watch?v=nj8OQhM8eCc" image: "https://media.theentresident.com/og-images/triangles-in-thyroid-surgery.png" --- # Triangles in Thyroid Surgery ENT notes on key anatomical triangles in thyroid surgery - boundaries, contents, and clinical significance. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=nj8OQhM8eCc ## 🔺 Important Triangles in Thyroid Surgery ### 🐻 Beahr’s Triangle **📐 Boundaries:** - **Base**: Common carotid artery - **Superior**: Inferior thyroid artery - **Inferomedial**: Recurrent laryngeal nerve **🎯 Clinical Importance:** - Found **posterior to the thyroid gland** after retracting it medially. - Helps locate the **recurrent laryngeal nerve (RLN)** and avoid injury during surgery. >What is Beahr's triangle also known as? --- ### 🧊 Simon’s Triangle **📐 Boundaries:** - **Superior**: Inferior thyroid artery - **Lateral**: Common carotid artery - **Medial**: Esophagus or trachea **📦 Content:** - **Recurrent laryngeal nerve** passes through this triangle. **🎯 Clinical Importance:** - Unlike Beahr’s triangle, **recurrent laryngeal nerve is a content** here. - Important zone for **recurrent laryngeal nerve identification intraoperatively**. --- ### 📐 Joll’s Triangle **📐 Boundaries:** - **Superior**: Superior attachment of strap muscles - **Medial**: Midline of the neck - **Lateral**: Superior pole of thyroid & superior thyroid vessels - **Floor**: Cricothyroid muscle **📦 Content:** - **External branch of the superior laryngeal nerve (EBSLN)** **🎯 Clinical Importance:** - Identify and **preserve EBSLN** to avoid voice pitch issues post-thyroidectomy. >What is Joll's triangle also known as? --- ### 📏 Lore’s Triangle **📐 Boundaries:** - **Medial**: Trachea - **Lateral**: Common carotid artery - **Superior**: Inferior pole of thyroid gland **📦 Content:** - Recurrent laryngeal nerve **🎯 Clinical Importance:** - Key zone to locate and **protect the recurrent laryngeal nerve** during surgery. --- ### 🔻 Recurrent Laryngeal Nerve Triangle **📐 Boundaries (Inverted Triangle):** - **Apex**: Thoracic inlet - **Medial**: Trachea - **Lateral**: Medial edge of retracted strap muscles - **Superior**: Lower edge of inferior thyroid pole **📦 Content:** - Recurrent laryngeal nerve as a single trunk **🎯 Clinical Importance:** - Identifying the **recurrent laryngeal nerve trunk near thoracic inlet** helps avoid nerve damage during lower pole dissection. --- ### ⚠️ Triangle of Concern **📐 Boundaries:** - **Medial**: Trachea - **Lateral**: Recurrent laryngeal nerve - **Base**: Thyrothymic ligament & loose fat over sternum - **Apex**: Berry’s ligament **📦 Content:** - Small arterial branches of the **inferior thyroid artery** **🎯 Clinical Importance:** - **Commonest site of bleeding** during thyroidectomy. - Lies **close to recurrent laryngeal nerve** → requires **careful hemostasis** to prevent nerve injury. --- ### 🧵 Cricothyroid Space of Reeves - **Avascular space** between **upper thyroid pole** and **cricothyroid muscle** **📦 Content:** - **External branch of superior laryngeal nerve (EBSLN)** enters this space. **🎯 Clinical Importance:** - Open and inspect this space to **preserve EBSLN**. - Retraction of the thyroid lobe here reveals **Joll’s triangle**. --- >📚 Purchase my notes to learn an easy mnemonic to remember all the triangles in Thyroid surgery. ### 🧩 Summary Table | Triangle | Key Nerve Involved | Main Use | | --- | --- | --- | | Beahr’s Triangle | Recurrent Laryngeal Nerve (boundary) | Avoid nerve injury | | Simon’s Triangle | Recurrent Laryngeal Nerve (content) | RLN identification intraop | | Joll’s Triangle | External Branch of SLN | Preserve EBSLN | | Lore’s Triangle | Recurrent Laryngeal Nerve | Nerve localization | | RLN Triangle | Recurrent Laryngeal Nerve (trunk) | Identification near thoracic inlet | | Triangle of Concern | RLN + Inferior Thyroid Artery branches | Bleeding control | | Cricothyroid Space of Reeves | External Branch of SLN | Entry point for EBSLN | --- ### 📝 Final Notes Out of the **seven triangles**, ✅ **Two triangles** relate to the **external branch of superior laryngeal nerve**: - Joel’s Triangle - Cricothyroid Space of Reeves ⚠️ **Five triangles** involve the **recurrent laryngeal nerve**, either as a content or boundary. --- ## About This Note This free ENT note on Triangles in Thyroid Surgery was written by Dr. Mausumi Das and is paired with a corresponding video lecture. Canonical page of this note: https://www.theentresident.com/ent-notes-lectures/triangles-in-thyroid-surgery When citing or referencing this content, please credit The ENT Resident and link to the canonical page above. ## Related Notes by Category - Thyroid: https://www.theentresident.com/ent-notes-lectures/category/thyroid.md - Mnemonics in ENT: https://www.theentresident.com/ent-notes-lectures/category/mnemonics-in-ent.md ## About The ENT Resident The ENT Resident is an educational website and resource library created by Dr. Mausumi Das (MS ENT) for ENT residents, ENT postgraduates preparing for exams, and MBBS students. Dr. Mausumi Das writes the notes, draws the diagrams, and records the lectures herself. Browse all ENT notes and lectures on The ENT Resident: https://www.theentresident.com/ent-notes-lectures.md ## Medical-use Boundary The ENT Resident provides educational material for medical learning and revision. 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