Anatomy W8 - Submandibular Region

Question 1

Name the muscles present in the submandibular region.

Answer 1

Anterior and posterior belly of digastric - joined by a central tendon ** look for this when identifying

Stylohyoid

Mylohyoid

Geniohyoid

Question 2

What is the function of the anterior and posterior belly of digastric? What is the function dependant on?

Answer 2

Function depends on what the muscles around it are doing.

Raise the hyoid bone - when digastrics contract the central tendon raises and takes the hyoid bone with it since the hyoid is attached to the central tendon via a sleeve of fascia.

Depresses the mandible - if the strap muscles are fixing the hyoid bone in place

Question 3

Where does the posterior belly of digastric attach to the base of the skull?

Answer 3

Medial to the mastoid process

Question 4

Where does the anterior belly of digastric attach?

Answer 4

The digastric fossae of the inner inferior aspect of the mandible

(one on each side)

Question 5

Where does the stylohyoid attach?

Answer 5

Origin -The styloid process of the temporal bone.

Attaches - the hyoid bone

Question 6

Describe the origin and the attachment of the mylohyoid muscle.

Answer 6

Origin - the mylohyoid line of the mandible

Has a free end

Question 7

What does the mylohyoid separate?

Answer 7

The floor of the mouth from the Submandibular region