supra and infrahyoid muscles O-I-A

digastric origin anterior belly

digastric fossa of the mandible

digastric origin posterior belly

mastoid notch of temporal bone

digastric origin

anterior belly: digastric fossa, posterior belly: mastoid notch

digastric insertion

intermediate tendon to body and greater horn of hyoid

digastric action

depresses mandible against resistance; elevates & steadies hyoid during swallowing / speaking

stylohyoid origin

styloid process of temporal bone

stylohyoid insertion

body of hyoid

stylohyoid actions

elevates & retract hyoid, elongating floor of the mouth

digastric O-I, A

anterior belly: digastric fossa, posterior belly: mastoid notch- intermediate tendon to body and greater horn of hyoid; depresses mandible against resistance, elevates & steadies hyoid during swallowing & speaking

stylohyoid O-I, A

styloid process - body of hyoid, elevates & retract hyoid, elongating floor of the mouth

mylohyoid origin

mylohyoid line of the mandible

mylohyoid insertion

mylohyoid raphe & body of hyoid

mylohyoid actions

elevates hyoid, floor of mouth, and tongue when speaking and swallowing

mylohyoid O-I, A

mylohyoid line of mandible - mylohyoid raphe & body of hyoid, elevates hyoid, floor of mouth, & tongue when speaking / swallowing

geniohyoid origin

mental spine of mandible

geniohyoid insertion

body of hyoid

geniohyoid actions

bring hyoid anterosuperior, shortens floor of mouth, widens pharynx

geniohyoid O-I, A

mental spine of mandible - body of hyoid, draws hyoid anterosuperior, shortens floor of mouth, widens pharynx

omohyoid origin

anterior surface of scapula near suprascapular notch

omohyoid insertion

inferior border of hyoid

omohyoid actions

depresses, retracts, and steadies hyoid

omohyoid O-I, A

superior border of scapula near suprascapular notch - inferior border of hyoid, depresses / retracts / stabilizes hyoid

sternohyoid origin

manubrium of sternum and medial end of clavicle

sternohyoid insertion

body of hyoid

sternohyoid actions

depress hyoid after elevation during swallowing

sternohyoid O-I, A

manubrium, medial end of clavicle - body of hyoid - depresses hyoid after elevation during swallowing

sternothyroid origin

posterior surface of manubrium

sternothyroid insertion

oblique line of thyroid cartilage

sternothyroid actions

depress hyoid and larynx

sternothyroid O-I-A

posterior surface of manubrium - oblique line of thyroid cartilage - depresses hyoid and larynx

thyrohyoid origin

oblique line of thyroid cartilage

thyrohyoid insertion

inferior border of body and greater horn of hyoid

thyrohyoid actions

depresses hyoid, elevates larynx

thyrohyoid O-I-A

oblique line of thyroid cartilage - inferior border of body and greater horn of hyoid - depresses hyoid, elevates larynx