annie's - muscle origin, insertion, & action

platysma orgin

fascia of chest

platysma insertion

lower margin of the mandible & skin at corner of muscle

platysma action

tense skin of neck

mylohyoid origin

medial surface of mandible

mylohyoid insertion

hyoid bone

mylohyoid action

elevates the hyoid bone & floor of mouth

digastric anterior belly origin

lower margin of the mandible

digastric posterior belly origin

mastoid process of the temporal bone

digastric insertion

by a connective tissue loop to the hyoid bone

digastric action

open mouth & depress the mandible

sternohyoid origin

manubrium & medial end of the clavicle

sternohyoid insertion

lower margin of the hyoid bone

sternohyoid action

depresses larynx & hyoid bone if the mandible is fixed

sternothyroid origin

posterior surface of the manubrium

sternothyroid insertion

thyroid cartilage

sternothyroid action

depresses larynx & hyoid bone

omohyoid origin

superior surface of the scapula

omohyoid insertion

hyoid bone, lower border

omohyoid action

depresses & retracts the hyoid bone

thyrohyoid origin

thyroid cartilage

thyrohyoid insertion

hyoid bone

thyrohyoid action

depresses hyoid bone or elevates larynx if hyoid bone is fixed

sternocleidomastoid origin

manubrium of the sternum & medial portion of the clavicle

sternocleidomastoid insertion

mastoid process of temporal bone and superior nuchal line of occipital bone

sternocleidomastoid action

flexes and laterally rotates the head

pectoralis major origin

sternal end of clavicle, sternum cartilage of ribs 1-6, & aponeurosis of external oblique

pectoralis major insertion

fibers converge to insert by a short tendon into the intertubercular sulcus & greater tubercle of the humerus

pectoralis major action

adducts & medially rotates arms against resistance

pectoralis minor origin

anterior surface of ribs 3-5 (or 2-4)

pectoralis minor insertion

coracoid process of the scapula

pectoralis minor action

with fixed fibs, draws the scapula forward and & downward

serratus anterior origin

by a series of muscle slips from ribs 1-8 (or 9)

serratus anterior insertion

entire anterior surface of vertebral border of the scapula

serratus anterior action

rotates the scapula so its inferior angle moves laterally & upward

external intercostals origin

inferior border of the above

external intercostals insertion

superior border of the rib below

external intercostals action

pulls the ribs toward one another to elevate the rib cage

internal intercostals origin

superior border of the below

internal intercostals insertion

inferior border of the above

internal intercostals action

draws ribs together, depresses rib cage

external oblique origin

by fleshy strips from outer surface of the lower 8 ribs

external oblique insertion

most fibers insert into the linea alba via a broad aponeurosis

external oblique action

flex vertebral column and compress abdominal wall. rotating trunk & flexing laterally

internal oblique origin

lumbar fascia, iliac crest, and inguinal ligament

internal oblique insertion

linea alba, pubic crest, last 3 or 4 ribs, and costal margin

internal oblique action

flex vertebral column and compress abdominal wall. rotating trunk & flexing laterally

transversus abdominis origin

lumbar fascia, cartilages of the last 6 ribs, iliac crest

transversus abdominis insertion

linea alba, pubic crest

transversus abdominis action

compresses abdominal contents

rectus abdominis origin

pubic crest & symphysis

rectus abdominis insertion

xiphoid process and costal cartilages of ribs 5-7

rectus abdominis action

flex & rotate lumbar region of the vertebral column

linea alba

midline "white" tendinous seam joining the abdominal muscles

tendinous intersection

tendons between sections of the rectus abdominis

transversus thoracis origin

xiphoid process and the sternum

transversus thoracis insertion

cartilages of the 2-6 ribs

transversus thoracis action

pulls the abdominal wall inwards

diaphragm origin

internal surfaces of the rib cage & sternum, costal cartilages of the last 6 ribs & lumbar vertebrae

diaphragm insertion

central tendon

diaphragm action

prime mover of inspiration, flattens on contraction

epicranial aponeurosis

tendon that connects the fontal belly and occipital belly muscles

occipitofrontalis: frontal belly origin

epicranial aponeurosis

occipitofrontalis: frontal belly insertion

skin of the eyebrows & root of the nose

occipitofrontalis: frontal belly action

raises the eyebrows

occipitofrontalis: occipital belly origin

occipital & temporal bones

occipitofrontalis: occipital belly insertion

epicranial aponeurosis

occipitofrontalis: occipital belly action

fixes aponeurosis & pulls the scalp posteriorly

corrugator supercilii origin

arch of the frontal bone

corrugator supercilii insertion

skin of the eyebrow

corrugator supercilii action

draws the eyebrows medially & inferiorly

orbicularis oculi origin

frontal and maxillary bones

orbicularis oculi insertion

tissue of eyelid

orbicularis oculi action

closes eyes

zygomaticus major and minor origin

zygomatic bone

zygomaticus major and minor insertion

skin & muscle at corner of mouth

zygomaticus major and minor action

raises lateral corners of mouth

orbicularis oris origin

arises indirectly from maxilla and mandible

orbicularis oris insertion

encircles mouth; inserts into muscle & skin at angles of mouth

orbicularis oris action

closes lips

buccinator origin

molar region of maxilla and mandible

buccinator insertion

orbicularis oris

buccinator action

compresses cheek

levator labii superioris origin

zygomatic bone and infraorbital margin of maxilla

levator labii superioris insertion

skin & muscle of upper lip

levator labii superioris action

opens lips

depressor labii inferiors origin

body of mandible lateral to its midline

depressor labii inferiors insertion

skin & muscle of lower lip

depressor labii inferiors action

draws lower lip inferiorly

depressor anguli oris origin

body of mandible below incisors

depressor anguli oris insertion

skin & muscle at angle of mouth

depressor anguli oris action

draws corners of mouth down & laterally

mentalis origin

mandible below incisors

mentalis insertion

skin of chin

mentalis action

wrinkles chin

masseter origin

zygomatic arch & zygomatic bone

masseter insertion

angle and ramus of mandible

masseter action

prime mover of jaw closure

temporalis origin

temporal fossa

temporalis insertion

coronoid process of the mandible

temporalis action

closes jaw