muscles of the triangles of the neck

Question 1

1. mylohyoid muscle

Answer 1

1. forms the floor of the oral cavity and supports the floor of the mouth
2. Attachments= from the mylohyoid line of the mandible to the hyoid bone.
3. IN= nerve to mylohyoid muscle a branch of the inferior alveolar nerve CNV3
4. MA= elevates the hyoid bone, the floor of the mouth, tongue during swallowing and speaking

Question 2

2. geniohyoid muscle

Answer 2

1. Att= from the inferior mental spine of the mandible to the body of the hyoid bone
2. IN= C1 via the hypoglossal nerve CN XII
3. MA= elevates the hyoid bone anteriorsuperiorly, shortens the floor of the mouth, and widens the pharynx

Question 3

3. stylohyoid muscle

Answer 3

1. Att= from the styloid process of the temporal bone to the body of the mandible
2. IN= styloid process of the facial nerve CN VII
3. MA= elevates and retracts the hyoid, elongating the floor of the mouth/Initiates a swallowing action by pulling the hyoid bone in a posterior and superior direction

Question 4

4. anterior belly of the digastric muscle

Answer 4

1. Att= from digastric fossa of the mandible to the intermediate tendon at the greater horn of the hyoid
2. IN= nerve to mylohyoid which is a branch of the inferior alveolar nerve

3. MA=WORKING WITH INFRAHYOID
MUSCLES, DEPRESSES MANDIBLE
AGAINST RESISTANCE, ELEVATES
AND STEADIES HYOID DURING
SWALLOWING AND SPEAKING

Question 5

4. posterior belly of the digastric muscle

Answer 5

1. Att= styloid process of the temporal bone to the intermediate tendon at the greater horn of the hyoid
2. IN= digastric branch of the facial nerve

3. MA= WORKING WITH INFRAHYOID
MUSCLES, DEPRESSES MANDIBLE
AGAINST RESISTANCE, ELEVATES
AND STEADIES HYOID DURING
SWALLOWING AND SPEAKING

Question 6

A. sternohyoid muscle

Answer 6

1. Att= manubrium of the sternum and medial clavicular end to the body of the hyoid
2. IN= C1-C3 of ansa cervicalis
3. MA= depresses the hyoid after elevation during swallowing

Question 7

B. omohyoid muscle

Answer 7

1. Att= superior aspect of the scapular to the inferior border of the hyoid.
2. In= C1-C3 of ansa cervicalis
3. MA= depresses, retracts, stabilize the hyoid

Question 8

C. sternothyroid muscle

Answer 8

1. Att= from posterior surface of the manubrium to the oblique surface of the thyroid cartilage
2. IN= C2-C3 branch of ansa cervicalis
3. MA= depresses the hyoid and the larynx

Question 9

D. thyrohyoid muscle

Answer 9

1. Att= from the oblique line of the thyroid cartilage to the body and greater horn of the hyoid
2. IN= C1 through hypoglossal nerve CNX2
3. MA= depresses the hyoid and elevates the larynx