Muscle Lab 3 Origin, Insertion, Action Flashcards
Sternomastoid
O - Sternum
I - Mastoid process/ temporal bone
A - Turn and depress head
Cleidomastoid
O - Clavicle
I - Mastoid process
A - Turn head
Mylohyoid
O - Mandible
I - Hyoid
A - Raise the floor of the mouth
Geniohyoid
O - inner surface of the mandibular symphysis
I - hyoid bone
A - elevates and protects the hyoid
Digastric
O - temporal bone
I - dentary bone
A - depresses the lower jaw; opens the mouth
Masseter
O - Zygoma/malar
I - Dentary bone
A - Elevate lower jaw; close mouth
Temporalis
O - Temporal bone
I - Coronoid process of mandible
A - Elevate mandible (close mouth)
Sternothyroid
O - Sternum, 1st costal cartilage
I - Hyoid
A - Draws hyoid posteriorly; pulls tongue backward
Thyrohyoid
O - Sternum, 1st costal
I - Hyoid
A - Draws hyoid
Pectoralis Major
O - Sternum
I - Humerus
A - Adducts humerus
Pectoralis Minor
O - Sternum
I - Humerus
A - Adducts Humerus
Clavodeltoid
Clavobrachialis
O - Clavicle
I - Humerus
A - Pulls humerus forward
Clavotrapezius
O - Occipital bone and mid-dorsal line
I - Clavicle
A - Pulls humerus forward
Acromiotrapezius
O - cervical and thoracic vertebrae
I - scapula
A - pull scapula posteriorly
Spinotrapezius
O - thoracic vertebrae
I - scapula
A - pull scapula posteriorly
