Cervical muscles

Question 1

Platysma

Answer 1

O: Flat sheet of muscle lying in the superficial fascia over the front of the neck from the lower border of the mandible
I: Crosses the clavicle and joins pectoralis
A:
Depress the mandible
Open the mouth
In: Facial n. (VII)

Question 2

Longus colli - superior oblique part

Answer 2

O: Anterior tubercle of transverse process C3-C6
I: Anterior tubercle of atlas
A:
Bilateral: flexion of the cervical spine
Unilateral: ipsilateral inclination and flexion of the cervical spine
In: C1-C4

Question 3

Longus colli - vertical part

Answer 3

O: Anterior sides of vertebral bodies T1-T3
I: Anterior tubercle of vertebral bodies C4-C6
A:
Bilateral: flexion of the cervical spine
Unilateral: ipsilateral inclination and flexion of the cervical spine
In: C1-C4

Question 4

Longus colli - inferior oblique part

Answer 4

O: Anterior sides of vertebral bodies T1-T3
I: Anterior tubercle of transverse process C5-C6
A:
Bilateral: flexion of the cervical spine
Unilateral: ipsilateral inclination and rotation of the cervical spine
In: C2-C6

Question 5

Longus capitis

Answer 5

O: Anterior tubercle of transverse process C3-C6
I: Basilar part of occipital bone
A:
Bilateral: flexion of the head
Unilateral: slight ipsilateral inclination
In: C3-C4

Question 6

Scalene (anterior, middle, posterior)

Answer 6

O: TP of C3-C7
I: 1st (ant., sup.) and 2nd (post.) ribs
A: Raises upper ribs
Bilateral: flexion of cervical spine
Unilateral: ipsilateral latero flexion
In: Anterior branches of spinal nn.

Question 7

Sternocleidomastoid

Answer 7

O:
Sternal head : anterior surface of manubrium
Clavicular head : medial third of the clavicle
I:
Mastoid process and the lateral part of the superior nuchal line
A:
Unilateral:
* Ipsilateral sidebending
* Contralateral rotation
Bilateral: Flexion of the cervical spine
In: Spinal accessory n. (CN XI)