Tempromandibular Joint muscles origins and insertions

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orbicularis oris origin
muscle fibers surrounding the opening of the mouth
orbicularis oris insertion
skin at the corner of the mouth
orbicularis oris action
closes mouth and protrudes and shapes lips
Buccinator origin
maxilla and mandible
Buccinator insertion
fascia at corner of the mouth
buccinator action
compress the cheeks
temporalis origin
temporal fossa
temporalis insertion
coronoid process and ramus of mandible
temporalis action
bilaterally: elevation, retrusion unilaterally: ipsilateral lateral deviation
masseter origin
Zygomatic arch of temporal bone and zygomatic process of maxilla
masseter insertion
Angle of ramus and coronoid process of mandible
masseter action
Bilaterally: elevation Unilaterally: ipsilateral lateral deviation
medial pterygoid origin
Lateral pterygoid plate of the sphenoid bone and tuberosity of the maxilla
medial pterygoid insertion
ramus and angle of mandible
medial pterygoid action
bilateral: protrudes and elevates mandible unilateral: contralateral lateral deviation
lateral pterygoid origin
lateral pterygoid plate and greater wing of sphenoid
lateral pterygoid insertion
Mandibular condyle and articular disk
lateral pterygoid action
bilateral: protrudes and depresses mandible unilateral: contralateral lateral deviation
What are the suprahyoid muscles?
digastric, stylohyoid, mylohyoid, geniohyoid
suprahyoid muscles action
assist in depressing mandible
What are the infrahyoid muscles?
omohyoid, sternohyoid, sternothyroid, thyrohyoid
What are the infrahyoid muscle action
Stabilize the hyoid bone
internal intercostal muscles origin
Ribs below
internal intercostal muscles insertion
Ribs below
internal intercostal muscles action
depress ribs during expiration
external intercostal muscles origin
Ribs above
Eternal intercostals insertion
Ribs below
external intercostal muscles action
Elevate ribs in forced inspiration
diaphragm origin
xiphoid process, ribs, lumbar vertebrae
diaphragm insertion
central tendon
diaphragm action