For medical, nursing, and physiotherapy undergraduates, and postgraduates

1. DIGASTRIC
TRIANGLE

2. INTRODUCTION
• The Digastric triangle is one of the paired
triangles in the anterior triangle of neck.

5. BOUNDARIES
• Superiorly / Base :
• Lower border of the body of mandible and a
line extending from the angle of mandible to
the mastoid process.
• Postero-inferiorly :
• Posterior belly of the Digastric and Stylohyoid
muscles.

6. BOUNDARIES
• Antero-inferiorly : Anterior belly of Digastric
• Floor : Mylohyoid, Hyoglossus and a part of
middle constrictor

7. BOUNDARIES
• It is covered by :
1. Skin
2. Superficial fascia with Platysma muscle
3. Deep fascia containing branches of Facial
nerve and Transverse Cutaneous Cervical
nerve

11. DIVISIONS
• Its divided into :
• Anterior &
• Posterior parts

12. CONTENTS

13. ANTERIOR PART
1. Superficial part of submandibular gland
2. Facial vein and sub - mandibular lymph nodes
3. Facial artery
4. Mylohyoid vessels and nerve
5. A part of hypoglossal nerve.

15. POSTERIOR PART
1. Lower part of Parotid gland overlapping the
posterior belly of digastric muscle.
2. External carotid artery
3. Carotid sheath containing Internal carotid artery,
internal jugular vein and vagus nerve – pass
more deeply beneath the Parotid gland and
Styloid process.

17. APPLIED ANATOMY
1. Infection in sub-mandibular region is limited
to a triangular region.
2. Ludwig’s angina
3. Trigeminal neuralgia
4. Mandibular nerve injury
5. Bell’s palsy

20. THANK YOU

23. • Ludwig’s angina is a type of severe, diffuse
cellulitis, involving the bilateral tissue spaces
on the floor of the mouth, namely the
submandibular, submental, and sublingual
spaces.
• Trigeminal neuralgia (TN or TGN) is a chronic
pain disorder that affects the trigeminal nerve.
• Bell's palsy is a type of facial paralysis that
results in an inability to control the facial
muscles on the affected side.