Practical Muscles Flashcards
Anterior Digastric Origin
Digastric fossa of mandible
Posterior Digastric Origin
Mastoid notch of temporal bone
Anterior and Posterior Digastric insertion
Intermediate tendon to body and greater or of hyoid
Anterior and Posterior Digastric Action
With the infrahyoid muscles depresses mandible against resistance; and elevates and steadies hyoid during speaking and swallowing
Posterior Scalene Origin
Posterior tubercles of transverse processes of C5-C7 vertebrae
Posterior scalene insertion
External border of 2nd rib
Posterior scalene action
unilaterally flexes neck laterally to same side; bilaterally elevates 2nd rib during forced inspiration, and flexes cervical spine
Middle Scalene Origin
Posterior tubercles of transverse processes of C5-C7 vertebrae
Middle Scalene Insertion
Superior surface of 1st rib; posterior to groove for subclavian artery
Middle Scalene Action
Unilaterally flexes neck to same side; bilaterally elevates 1st rib during forced inspiration and flexes cervical spine
Anterior Scalene Origin
Transverse processes of C3-C6 vertebrae
Anterior Scalene Insertion
1st rib
Anterior Scalene Action
bilaterally flexes cervical spine; unilaterally laterally flexes cervical spine
Splenius Cervicis origin
Nuchal ligament and spinous processes of C7-T3 or T4 vertebrae
Splenius Cervicis Insertion
Tubercles of transverse processes of C1-C3 or C4 vertebrae
Splenius Cervicis Action
Unilaterally laterally flex neck and rotate head to same side; bilaterally extend head and neck
Longus Capitis Origin
Basilar part of occipital bone
Longus Capitis Insertion
Anterior tubercles of C3-C6 transverse processes
Longus Capitis Action
Unilaterally laterally flexes cervical spine to same side; bilaterally flexes cervical spine
Temporalis Origin
floor of temporal fossa and deep surface of temporal fascia
Temporalis Insertion
tip and medial surface of coronoid process and anterior border of ramus of mandible
Temporalis Action
Elevates mandible; posterior, more horizontal fibers are primary retractors of mandible
Masseter Origin
inferior border and medial surface of maxillary process of zygomatic arch
Masseter insertion
Angle and lateral surface of ramus of mandible