Muscles of the Head, Neck, and Back

From Chapter 11

What is an action of the frontalis muscle?

raise the eyebrows

What is an action of the occipitalis muscle?

draw the scalp backwards

What is an action of the orbicularis oris?

compress and purse the lips

What is an action of the orbicularis oculi?

close the eye

What is an action of the platysma?

tense the skin of the neck

What is an action of the zygomaticus major?

pull the corners of the mouth superiorly

What is an action of the zygomaticus minor?

raise the upper lip and expose the teeth

What is an action of the buccinator?

move food medially between the molars

What are the origins of the sternocleidomastoid?

mastoid process of the temporal bone

What is the insertion of the sternocleidomastoid?

manubrium of the sternum and the clavicle

What is an action of the sternocleidomastoid?

when one side contracts, the head turns in the opposite direction

What are the origins of the splenius capitus?

occipital bone and the mastoid process of the temporal bone

What is the insertion of the splenius capitus?

ligament of nuchae

What is an action of the splenius capitus?

when one side contracts, the head turns in the same direction

What is the origin of the splenius cervicus?

transverse processes of the cervical vertebrae

What is the insertion of the splenius cervicus?

spinous processes of the thoracic vertebrae 3-6

What is an action of the splenius cervicus?

when one side contracts, the head turns in the same direction

What are the muscles that form the erector spinae groups?

iliocostalis group, longissimus group, spinalis group

What is the action of the erector spinae groups?

when one side contracts, the vertebral column will laterally flex in the same direction

What is an action of the quadratus lumborum?

when one side flexes, the lumbar portion of the vertebral column will flex

What is the origin of the teres major?

lateral border and inferior angle of the scapula

What are the insertions of the teres major?

lesser tubercle and intertubercular sulcus of the humerus

What is an action of the teres major?

extends, adducts, and medially rotates the arm

What are the origins of the latissimus dorsi?

spinous processes of the lower thoracic vertebrae, false ribs, iliac crest of the ilium

What is the insertion of the latissimus dorsi?

intertubercular sulcus of the humerus

What is an action of the latissimus dorsi?

extends, adducts, and medially rotates the arm

What are the origins of the deltoid?

acromial end of the clavicle, acromion and spine of the scapula

What is the insertion of the deltoid?

deltoid tuberosity of the humerus

What is an action of the deltoid?

abducts, flexes, and extends the arm

What are the origins of the pectoralis major?

clavicle, costal cartilages

What is the insertion of the pectoralis major?

intertubercular sulcus of the humerus

What is an action of the pectoralis major?

flexes, adducts, and medially rotates the arm

What is this muscle?

frontalis

What is this muscle?

occipitalis

What is this muscle?

orbicularis oris

What is this muscle?

orbicularis oculi

What is this muscle?

platysma

What is this muscle?

zygomaticus major

What is this muscle?

zygomaticus minor

What is this muscle?

buccinator

What is this muscle?

temporalis

What are the origins of the temporalis muscle?

parietal and frontal bones

What is the insertion of the temporalis muscle?

coronoid process of the mandible

What is the action of the temporalis muscle?

elevate mandible at the jaw

What is this muscle?

masseter

What is the origin of the masseter muscle?

zygomatic arch

What are the insertions of the masseter?

coronoid process, angle, and ramus of the mandible

What is an action of the masseter muscle?

elevates mandible at the jaw

What is this muscle?

sternocleidomastoid

What is this muscle?

splenius capitus

What is this muscle?

splenius cervicus

What is this erector spinae group?

iliocostalis group

What is this erector spinae group?

longissimus group

What is this erector spinae group?

spinalis group

What is this muscle?

quadratus lumborum

What is this muscle?

teres major

What is this muscle?

latissimus dorsi

What is this muscle?

deltoid

What is this muscle?

pectoralis major