Suprahyoid region - submandibular fossa and submandibular gland (dave's notes)

Question 1

What are the limits of the submandibular fossa?

Answer 1

The submandibular fossa is deep to the investing fascia and the inferior border of the mandible, extending to mylohyoid muscle

Question 2

What is infection in the submandibular fossa called?

Answer 2

Ludwig’s angina

Question 3

Describe the submandibular gland

Answer 3

A mixed mucous and serous gland with a large superficial part and a small deep part

Question 4

Where is the superficial part of the submandibular gland found?

Answer 4

The superficial part fills the space between the mandible, mylohyoid and investing layer

Question 5

What are they three surfaces of the submandibular gland?

Answer 5

Lateral, inferior and medial

Question 6

What does the lateral surface of the submandibular gland lie against?

Answer 6

The submandibular fossa, overlapping the medial peterygoid. It is deeply grooved posteriorly by the facial artery

Question 7

What does the inferior surface of the submandibular gland lie against?

Answer 7

Skin, platysma, and investing fascia crossed by the facial vein and cervical branch of the facial nerve

Question 8

What does the medial surface of the submandibular gland lie against?

Answer 8

They mylohyoid and its vessels, posteriorly overlapping the hypoglossal nerve and deep lingual vein

Question 9

Where are the submandibular lymph nodes found?

Answer 9

On and within the gland

Question 10

What are the limits of the deep part of the submandibular gland?

Answer 10

The deep part extends forwards between mylohyoid and hypoglossal, with lingual nerve above, duct and hypoglossal nerve below.

Question 11

How long is the submandibular duct? Where does it run from/to?

Answer 11

5cm.
Emerges from the superficial part near the posterior border and runs between myelohyoid and hypoglossal, then between the sublingual gland and geniohyoid to open in the floor of the mouth.

Question 12

What is the blood supply ad venous drainage of the submandibular gland?

Answer 12

The facial artery. Venous drainage to the facial vein.

Question 13

Where does sumbandibular lymph drain to?

Answer 13

The submandibular lymph nodes

Question 14

What is the nerve supply to the submandibular gland?

Answer 14

Secretomotor from the submandibular ganglion (parasympathetic).
Preganglionic fibres pass from the SSN (pons) ??? via the nervous intermedius, chorda tympani, and lingual nerve
Sympathetic (vasoconstrictor) come from the facial artery plexus.

Question 15

Describe the development of the submandibular gland

Answer 15

Develops from a groove in the floor of the mouth whose blind end proliferates (ectodermal)