Digastric Triangle: Suprahyoid Muscles

Question 1

Digastric triangle

Answer 1

Submandibular region

Question 2

Auprahyoid msucles

Answer 2

1. Geniohyoid
2. Digastric
3. Mylohyoid
4. Stylohyoid

Question 3

Geniohyoid origin

Answer 3

Lower genial tubercle mandible

Question 4

Geniohyoid insertion

Answer 4

Anterior surface hyoid body

Question 5

Geniohyoid nerve supply

Answer 5

C1 via hypoglossal nerve

Question 6

Geniohyoid action

Answer 6

1. Elevation of hyoid in swallowing (if mandible is fixed)
2. Depression of mandible (if hyoid is fixed)

Question 7

Digastric origin

Answer 7

1. Anterior belly: digastric fossa mandible
2. Posterior belly: digastric (mastoid) notch mastoid process

Question 8

Digastric insertion

Answer 8

Intermediate tendon (connected to hyoid by fibrous loop)

Question 9

Digastric nerve supply

Answer 9

1. Anterior belly
   Nerve to mylohyoid (Mandibular nerve)
2. Posterior belly
   Facial nerve

Question 10

Digastric action

Answer 10

1. Elevation of hyoid in swallowing (if mandible is fixed)
2. Depression of mandible (if hyoid is fixed)

Question 11

Mylohyoid origin

Answer 11

Other name: Diaphragma oris
Mylohyoid line mandible

Question 12

Mylohyoid insertion

Answer 12

1. Anterior and middle fibers: mylohyoid raphe
2. Posterior fibers: hyoid body

Question 13

Mylohyoid nerve supply

Answer 13

Nerve to mylohyoid from inferior alveolar nerve (Mandibular nerve)

Question 14

Mylohyoid action

Answer 14

1. Elevation of hyoid and mouth flor in swallowing (if mandible is fixed)
2. Depression of mandible (if hyoid is fixed)

Question 15

Relations anterior belly: superficial

Answer 15

1. Skin
2. Fascia

Question 16

Relations anterior belly: deep

Answer 16

Mylohyoid muscle

Question 17

Relations posterior belly: superficial

Answer 17

1. 1 vein
   - anterior or common facial vein
2. 2 bones
   - mastoid process
   - mandible angle
3. 2 glands
   - parotid (lower end)
   - submandibular
4. 3 muscles
   - sternomastoid
   - Masseter
   - medial pterygoid

Question 18

Relations posterior belly: deep

Answer 18

1. 1 muscle
   - hypoglossus
2. 3 large blood vessels
   - ECA
   - ICA
   - IJV
3. 3 small arteries
   - lingual
   - facial
   - occipital
4. 3 last cranial nerves
   - 10th
   - 11th
   - 12th

Question 19

Posterior belly borders: upper

Answer 19

1. Stylohyoid muscle
2. Posterior auricular artery

Question 20

Posterior belly borders: deep

Answer 20

1. Hypoglossal nerve
2. Occipital artery

Question 21

Relations mylohyoid muscle: superficial (lower)

Answer 21

1. Skin
2. Superficial fascia (contains Platysma)
3. Deep fascia
4. Submandibular gland (superficial part
5. Anterior belly digastric
6. Nerve to mylohyoid
7. Facial artery and it’s submental branches
8. Submental lymph nodes

Question 22

Relations mylohyoid: deep (upper

Answer 22

4 muscles
2 glands
2 nerves
1 ganglion
1 artery
1. Hypoglossus
2. Lateral to hypoglossus
- styloglossus
- lingual nerve
- submandibular ganglion
- deep part submandibular gland and its duct
- hypoglossal nerve and its vena comitants
- suprahyoid artery
3. Anterior to hypoglossus
- geniohyoid
- genioglossus
- sublingual gland
- 3rd part lingual artery and it’s sublingual branch