Triangle of the Neck....... FROM ANATOMY

Anatomy study

1. Triangle of the Neck Dr. Partha S arathi Singha Lecturer (Anatomy)

2. ANTERIOR TRIANGLE OF THE NECK Boundaries Anterior: Anterior median line of the neck Posterior: Anterior border of the sternocleidomastoid muscle. Base: Lower border of the body of mandible and a line extending from the angle of mandible to the mastoid process.

3. Apex: M eeting point between anterior border of sternocleidomastoid and anterior median line. Roof: Investing layer of deep cervical fascia.

4. Sub division of Ant. T riangle 1. Submental triangle (half only). 2. Digastric (submandibular) triangle. 3. Carotid triangle. 4. Muscular triangle.

5. Submental Triangle On each side: Anterior belly of digastric muscle Base: Body of hyoid bone. Apex: Chin or symphysis menti Floor: mylohyoid muscles Roof: Investing layer of deep cervical fascia

6. Contents Submental lymph nodes (3 or 4 in number). Efferents from these nodes pass to the submandibular lymph nodes. Submental veins and commencement of anterior jugular veins.

7. Digastric (Submandibular) Triangle 1 . Submandibular salivary gland. 2. Submandibular lymph nodes. 3. Hypoglossal nerve. 4. Facial vein (lies superficial to the gland). 5. Facial artery (lies deep to the gland). 6. Submental artery. 7. Mylohyoid nerve and vessels. 8 . External carotid artery. 9. Carotid sheath and its contents. 10. Structures passing between the external and internal carotid arteries.

8. Carotid Triangle Superiorly: Posterior belly of digastric supplemented by stylohyoid Anteroinferiorly : Superior belly of omohyoid . Posteriorly: Anterior border of sternocleidomastoid Roof: deep cervical fascia.

9. Floor: Thyrohyoid , Hyoglossus , Middle con strictor , Inferior constrictor

10. Contents Carotid arteries Carotid sinus and carotid body Internal jugular vein Last three cranial nerves: Vagus nerve, Spinal accessory nerve, Hypoglossal nerve . Carotid sheath Ansa cervicalis Cervical part of the sympathetic chain Deep cervical lymph nodes.

11. Muscular Triangle

12. Contents Infrahyoid muscles: sternothyroid , sternohyoid , thyrohyoid .

13. Thank You