Muscles OIA Flashcards
Orbicularis oculi Origin
frontal and maxillary bones
Orbicularis oculi Insertion
skin around eyes
Orbicularis oculi Action
close and squint eyes
Orbicularis oris Origin
maxilla and mandible
Orbicularis oris Insertion
skin around lips
Orbicularis oris Action
closes and protrudes lips
Masseter Origin
zygomatic arch
Masseter Insertion
mandibular ramus
Masseter Action
elevates mandible
Sternocleidomastoid Origin
manubrium and clavicle
Sternocleidomastoid Insertion
Mastoid process
Sternocleidomastoid Action
head flexion and rotation
Trapezius Origin
occipital bone, c7 and thoracic vertebrae
Trapezius Insertion
spine of scapula and clavicle
Trapezius Action
stabilizes, raises and rotates scapula
Rectus Abdominis Origin
pubic bone
Rectus Abdominis Insertion
xiphoid process and ribs 5-7
Rectus Abdominis Action
flexes, rotates vertebrae, increases intraabdominal pressure
External oblique Origin
lower 8 ribs
External oblique Insertion
linea alba
External oblique Action
flexes, rotates, and laterally flexes trunk
Internal oblique Origin
lumbar fascia and iliac crest
Internal oblique Insertion
linea alba, pubic crest and last 3-4 ribs
Internal oblique Action
flexes, rotates and laterally flexes trunk
Erector spinae Origin
iliac crest, ribs and vertebrae
Erector spinae Insertion
ribs, vertebrae and skull
Erector spinae Action
keep the spine erect and extends trunk
Deltoid Origin
clavicle, acromion and spine of scapula
Deltoid Insertion
deltoid tuberosity of humerus
Deltoid Action
abducts, flexes, extends and rotates arm
Pectoralis major Origin
clavicle, ribs 1-6 and sternum
Pectoralis major Insertion
intertubercular groove of humerus