Tempromandibular Joint muscles origins and insertions

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

inspiration