OIA of muscles

Epicranus O

occipital bone/ temporal bone

epicranus I

epicranial aponeurosis

epicranius A

raises eyebrows

orbicularis oculi O

maxillary bone

orbicularis oculi I

tissue of eyelid

orbicularis oculi A

closes eye

levator labii superioris O

zygomatic bone

levator labii superioris I

skin

levator labii superioris A

raises lateral confer of the mouth upward

risorius O

fascia of massseter muscle

risorius I

skin at the angle of the mouth

risorius A

tense the lip

Depressor Labii inferioris O

body of mandible

Depressor Labii inferioris I

skin

Depressor Labii inferioris A

draws lips inferiorly

depressor anguli oris O

body of mandible

depressor anguli oris I

skin at angle of mouth

depressor anguli oris A

draws corners of mouth downward or laterally

orbicularis oris O

maxilla/ mandible

orbicularis oris I

skin at angle of mouth

orbicularis oris A

close lips

mentalis O

mandible

mentalis I

skin of chin

mentalis A

wrinkles the chin

buccinator O

molar region of maxilla

buccinator I

orbicularis oris

buccinator A

compresses cheek

masseter O

maxilla

masseter I

ramus of mandible

masseter A

prime mover of jaw closer/ elevate mandible

temporalis O

temporal fossa

temporalis I

coronoid process of mandible

temporalis A

close jaw

lateral pterygoid O

great wing of sphenoid

lateral pterygoid I

condylar process of mandible

lateral pterygoid A

grinding movements of teeth

medial pterygoid O

sphenoid

medial pterygoid I

medial surface of mandible

medial pterygoid A

grinding movement of teeth

corrugator supercilii O

arch of frontal bone

corrugator supercilii I

skin of eyebrow

corrugator supercilii A

draws eyebrow medial or inferiorly

platysma O

deltoid/ pectoral

platysma I

skin

platysma A

tense skin of neck

sternocleidomastoid O

manubrium of sternum

sternocleidomastoid I

mastoid process

sternocleidomastoid A

flexion of neck

scalenes O

transverse process of cervical vertebrae

scalenes I

anterolaterally on ribs 1-2

scalenes A

flexes and rotates neck

digastric O

mastoid process

digastric I

hyoid bone

digastric A

open mouth/ depress mandible

stylohyoid O

styloid process

stylohyoid I

hyoid bone

stylohyoid A

elevate and retracts hyoid bone

mylohyoid O

medial surface of mandible

mylohyoid I

hyoid bone

mylohyoid A

elevates hyoid bone during swallowing

omohyoid O

superior surface of scapula

omohyoid I

hyoid bone

omohyoid A

depresses larynx and hyoid bone

thyrohyoid O

thyroid cartilage

thyrohyoid I

hyoid bone

thyrohyoid A

depresses hyoid bone

sternohyoid O

manubrium of sternum

sternohyoid I

hyoid bone

sternohyoid A

depresses larynx and hyoid bone

sternothyroid O

posterior surface of sternum

sternothyroid I

thyroid cartilage of the larynx

sternothyroid A

depresses larynx and hyoid bone

pectoralis minor O

anterior surface of ribs 3-5

pectoralis minor I

coracoid process of scapula

pectoralis minor A

draws scapular forward and inferiorly

external intercostal O

inferior border of ribs

external intercostal I

superior border

external intercostal A

pulls ribs towards one another to elevate rib cage during inspiration

internal intercostal O

superior border of ribs below

internal intercostal I

inferior border

internal intercostal A

draws ribs together to depress rib cage for expiration

diaphragm O

inferior border of rib

diaphragm I

central tendon

diaphragm A

increased intra-abdominal pressure

pectoralis major O

clavicle

pectoralis major I

inter tubercular sulcus of humerus

pectoralis major A

mover of arm flexion

serrates anterior O

lateral spect of ribs 1-8

serrates anterior I

vertebral border of anterior surface the scapula

serrates anterior A

rotates scapula

deltoid O

spine of scapula

deltoid I

deltoid tuberosity of humerus

deltoid A

prime mover of arm abduction

rectus abdominis O

pubic crest

rectus abdominis I

xiphoid process

rectus abdominis A

flexes vertebral column

transverse abdominis O

iliac crest

transverse abdominis I

linea alba

tranverse abdominis A

compresses abdominal contents

external oblique O

anterior surface of lower 8 ribs