Lab quiz 2 Flashcards Preview

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Flashcards in Lab quiz 2 Deck (13):
1

Epicranius

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

2

Frontal belly of occipitofrontalis

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

3

Occipital belly of occipitofrontalis

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

4

Orbicularis Oris

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

5

Masseter

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

6

Temporalis

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

7

Buccinator

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

8

Medial pterygoid

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

9

Lateral pterygoid

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

10

Sternocleidomastoid

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.

11

platysma

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

12

Splenius capitus

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

13

semispinalis capitus

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