Lab quiz 2

Question 1

Epicranius

Answer 1

frontal belly of occipitofrontalis, occipital belly of occipitofrontalis, galea aponeurotica

Question 2

Frontal belly of occipitofrontalis

Answer 2

Origin: frontal bone and skin of forehead
insertion: galea aponeurotica
Action: elevates the eyebrows, wrinkles skin of forehead

Question 3

Occipital belly of occipitofrontalis

Answer 3

Origin: superior nuchal line
Insertion: Galea aponeurotica
Action: retracts the scalp slightly

Question 4

Orbicularis Oris

Answer 4

Origin: Maxilla and mandible as well as fascia and fibers from other muscles
Insertion: skin and lips surrounding mouth
Action: closes lips, puckers up the lips

Question 5

Masseter

Answer 5

Origin: zygomatic arch
insertion: lateral surface of ramus & angle of mandible and of coronoid process
Action: Elevates and protracts madible

Question 6

Temporalis

Answer 6

Origin: superior and inferior portions of temporal bone
Insertion: coronoid process of mandible
Action: Elevates and retracts mandible

Question 7

Buccinator

Answer 7

Origin: maxilla and mandible (alveolar processes)
Insertion: Orbicularis oris
Action: compresses the cheek

Question 8

Medial pterygoid

Answer 8

Origin: pterygoid process of sphenoid bone
Insertion: medial surface of ramus of mandible
Action: Elevate and protract mandible and moves it laterally

Question 9

Lateral pterygoid

Answer 9

Origin: pterygoid process of sphenoid bone
Insertion mandibular condyle
Action: Elevate and protract mandible and moves it laterally

Question 10

Sternocleidomastoid

Answer 10

Origin: manubrium and sternal end of clavicles
insertion: Mastoid processes of temporal bones
Action: Both contracted, head is pulled forward and down; one contracts, head turns opposite direction of side contracted.

Question 11

platysma

Answer 11

Origin:Fascia of deltoid and pectoralis major plus acromion of scapula
Insertion: Skin of cheek and mandible
Action: pulls lower inferiorly, tenses skin of neck

Question 12

Splenius capitus

Answer 12

Origin: Ligamentum Nuchae, ligament that runs length of cervical
Insertion: occipital bone and mastoid process of temporal bone
Action: Both contract extends head/neck. Unilateral contractions turn the head and neck to the same side

Question 13

semispinalis capitus

Answer 13

Origin: seventh cervical + first six thoracic
Insertion: between the superior and inferior nuchal lines of occipital bone
Action: Both contract extends head/neck. Unilateral contractions turn the head and neck to the same side