Digastric Triangle: Submandibular Salivary Gland

Question 1

Parts

Answer 1

1. Superficial
2. Deep

Question 2

Superficial

Answer 2

1. Main part
2. Superficial to mylohyoid

Question 3

Superficial: position

Answer 3

Submandibular fossa of mandible, wedged between it and mylohyoid extending:
1. Above: to mylohyoid line
2. Below: to intermediate tendon digastric
3. In front: to mental foramen
4. Behind: to mandible angle

Question 4

Superficial: surfaces

Answer 4

1. Inferolateral: superficial below mandible
2. Lateral: deep, in contact with mandible body
3. Medial

Question 5

Inferoateral surface relations

Answer 5

1. Skin
2. Superficial fascia: contains Platysma
3. Deep fascia
4. Submandibular lymph nodes
5. Anterior facial vein
6. Cervical branch facial nerve

Question 6

Lateral surface relations

Answer 6

1. Submandibular fossa
2. Medial pterygoid (insertion)
3. Facial artery (between gland and medial pterygoid)

Question 7

Medial surface relations

Answer 7

1. Anterior: mylohyoid with nerve to mylohyoid and submental artery
2. Intermediate: hypoglossus with 6 structures on its lateral surface
3. Posterior:
   - styloglossus
   - Stylohyoid ligament
   - Glossopharyngeal nerve

Question 8

Deep part of gland and its duct project from

Answer 8

Medial surface of superficial part

Question 9

Deep

Answer 9

Thin flat tongue like process deep to mylohyoid

Question 10

Deep position

Answer 10

On Hyoglossus lateral surface with lingual nerve above and hypoglossal nerve below
Submandibular duct extends along it

Question 11

Site of continuation of superficial and deep parts

Answer 11

Around mylohyoid posterior border

Question 12

Submandibular duct site

Answer 12

5 cm long arising from medial surface of superficial part running forwards along deep part between:
1. Mylohyoid (superficial)
2. Hyoglossus (deep)
3. Lingual nerve (above)
4. Hypoglossal nerve (below)
At anterior border Hyoglossus, lingual nerve hooks around (double crosses) the duct then continues forwards between:
1. Sublingual (superficial)
2. Genioglossus (deep)
To open in mouth flor in sublingual papilla summit on each side of tongue frenulum

Question 13

Why is the chances of having a stone in the submandibular duct 50 times higher than the chance of having them on the parotid duct?

Answer 13

1. Secretion is thick and viscid
2. Ducts drains against gravity
3. Ducts opens in mouth floor, food particles may enter forming stone nucleus
4. Patients complains of:
   - submandibular swelling
   - increasing in size during meals
   - returns to normal size in between

Question 14

Atrial supply

Answer 14

Glandular branches of facial artery

Question 15

Nerve supply

Answer 15

Passing through submandibular ganglion:
1. Sensory: lingual nerve
2. Sympathetic: plexus around facial artery
3. Parasympathetic: chorda tympani