The anterior triangles refer to bilateral anatomic subdivisions of the neck comprising the anterior surface of the neck, deep to the superficial cervical fascia and platysma muscle. Laterally, the anterior triangle is bounded by the anterior border of the sternocleidomastoid muscle

1. Anterior triangle of neck
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2. Contents
• Introduction
• Boundaries of anterior triangle
• Sub-divisions
• Clinical
• Summary
• MCQs
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3. Introduction
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4. Boundaries of anterior triangle
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5. Sub-divisions
Subdivided by digastric muscle and superior belly of
omohyoid muscle in 3½ triangles.
1. Submental (half only).
2. Digastric (Submandibular).
3. Carotid triangle.
4. Muscular triangle.
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7. 1. Submental
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8. 2. Digastric (Submandibular).
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9. Contents:
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10. 3. Carotid triangle
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11. Boundaries:
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13. 4. Muscular Triangle
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14. Clinical
• Infections of floor of mouth, tip of tongue, and incisor teeth
cause painful enlargement of submental lymph.
• Submandibular triangle is common site of swellings.
• Carotid tubercle of 6th cervical vertebra is about 4 cm above
the sternoclavicular joint.
• Carotid sinus syndrome: hypersensitive carotid sinuses often
had sudden attacks of syncope on rotation of head.
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15. Summary
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16. MCQs
1.) Digastric or submandibular triangle is having
submandibular gland which is the content of anterior part
of this triangle. Structure which divides digastric triangle
into anterior and posterior is:
A. Stylohyoid muscle
B. Stylohyoid ligament
C. Stylomandibular muscle
D. Stylomandibular ligament
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17. 2.) Infections of floor of mouth, tip of tongue, and incisor
teeth cause painful enlargement of submental lymph
nodes which are present is same name triangle.
Structure which make floor of this triangle is:
A. Stylohyoid muscle
B. Mylohyoid muscle
C. Digastric muscle
D. Omohyoid muscle
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18. 3.) Carotid arteries, carotid body and carotid sinus are
contents of carotid triangle which is limited by anterior
border of sternocleidomustiod muscle posteriorly.
Structure which make anteroinferior boundary is:
A. Anterior belly of digastric
B. Posterior belly of digastric
C. Superior belly of omohyoid
D. Inferior belly of omohyoid
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19. Clinical Vignette
1.) 14 year old boy came to your clinical having swelling
under chin. He felt pain when he touch that area.
Physician found infection in incisor teeth. Possible cause
of swelling under chin is:
A. Enlargement of deep cervical lymph nodes.
B. Enlargement of submental lymph nodes.
C. Enlargement of carotid artery
D. Enlargement of jugular vein
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20. 2.) 26 year old man felt sudden attacks of syncope on
rotation of head during wearing a shirt with tight collar or
a tie with tight knot. Possible clinical condition with this
man could be:
A. Hypersensitive carotid sinuses
B. Enlargement of carotid body
C. Hypersensitive of carotid body
D. Enlargement of carotid artery
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21. Thank You
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