ANT triangle muscles

Question 1

Platysma- O, I, IN, A

Answer 1

O- inf border of mandible, skin

I- deep pectoral + deltoid fascia

Inn- cervical br of facial n

A- Draws skin of neck superiorly when teeth clenched

Question 2

Sternohyoid- O, I, IN, A

Answer 2

O- Int surface of manubrium + steal end of clav + sternoclavicular lig

I- Bone of hyoid

IN- C1,2,3 (ansa cervicali)

A- Depressses hyoid

Question 3

Sternothyroid- O, I, IN, A

Answer 3

O- Post surface of manubrium + cartilage of 1st rib

I- Oblique line of thyroid cartilage

IN- C2,3 (ansa cervicallis)

A- Depress hyoid

Question 4

Thyrohyoid- O, I, IN, A

Answer 4

O- oblique line of thyroid cartilage

I- Inf border of body + greater horn of hyoid

IN- C1

A- depress hyoid/ elevate larynx

Question 5

Omohyoid sup belly - O,I, IN, A

Answer 5

O- intermediate tendon

I- inf border of body of hyoid

IN- C1

A- depress retract + steadys hyoid