Need To Know unit 2

Question 1

Sternocleidomastoid

Answer 1

Is located on the lateral and anterior aspects of the neck.
(A)Action:laterally flex the head and neck to the same side
Rotate the head and neck to the opposite side
Flex the neck
Assist to elevate the rib cage during inhalation
N(Innervation)(nerve): Spinal accessory

Question 2

Scalenes

Answer 2

A(action)Perform the vital task of elevating the upper ribs.

Question 3

Masseter

Answer 3

Is the primary chewing muscle and is used in speaking and swallowing
A(action) Eleveate the mandible(temporomandibular joint)
May assist to protract the mandible.
N(Innervation(nerve): Trigeminal nerve

Question 4

Temporalis

Answer 4

Located on the temporal aspect of the cranium.
A(action) Elevate the mandible, Retract the mandible
N(innervation)(nerve): Trigeminal nerve

Question 5

Platysma

Answer 5

A thin superficial sheath spanning the anterior neck from the mandible to the chest.
A(action):Assist to depress the mandible ,Tighten the fascia of the neck, Draw down corner of the mouth.
N(Innervation)(nerve): Facial

Question 6

Occipitofrontalis

Answer 6

A(action): Raises the eyebrows and wrinkle the forehead. Occipitalis:Anchor and retract the galea posteriorly.
(N)Innervation(nerve):Facial