Origin, Insertion, and Function of Human Neck Muscles

Question 1

Platysma

Answer 1

Origin: Fascia of deltoid

Insertion: Lower margin of
mandible

Function: Tenses skin of neck

Question 2

Sternocleidomastoid

Answer 2

Origin: Manubrium of
sternum

Insertion: Mastoid process of temporal bone

Function: Simultaneous contraction of both
muscles of pair causes flexion of neck

Question 3

Scalenes—anterior,

middle, and posterior

Answer 3

Origin: Transverse processes
of cervical vertebrae

Insertion: Anterolaterally on
ribs 1–2

Function: Flex and slightly rotate neck; elevate ribs 1–2

Question 4

Digastric

Answer 4

Origin: Lower margin of
mandible

Insertion: hyoid bone

Function: elevate hyoid
bone; open mouth

Question 5

Stylohyoid

Answer 5

Origin: Styloid process of
temporal bone

Insertion: Hyoid bone

Function: Elevates hyoid bone

Question 6

Mylohyoid

Answer 6

Origin: Medial surface of
mandible

Insertion: Hyoid bone

Function: Elevates hyoid bone

Question 7

Sternohyoid

Answer 7

Origin: Manubrium of
clavicle

Insertion: Hyoid bone

Function: depresses hyoid bone

Question 8

Sternothyroid

Answer 8

Origin: Posterior surface of
manubrium

Insertion: Thyroid cartilage of
larynx

Function: depresses hyoid bone

Question 9

Omohyoid

Answer 9

Origin: Superior surface of
scapula

Insertion: Hyoid bone

Function: depresses hyoid bone

Question 10

Thyrohyoid

Answer 10

Origin: Thyroid cartilage

Insertion: Hyoid bone

Function: depresses hyoid bone

Question 11

Levator scapulae

Answer 11

Origin: Transverse processes of c1-c4

Insertion: Medial border of
scapula superior to spine

Function: laterally flexes neck

Question 12

Trapezius

Answer 12

Origin: occipital bone

Insertion: spinous process of scapula

Function: extends head

Question 13

Splenius capitis

Answer 13

Origin: spinous process of c2-T4

Insertion: transverse process c2-c4

Function: extend head