Tempromandibular Joint muscles origins and insertions

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orbicularis oris origin

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1

orbicularis oris origin

muscle fibers surrounding the opening of the mouth

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2

orbicularis oris insertion

skin at the corner of the mouth

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3

orbicularis oris action

closes mouth and protrudes and shapes lips

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4

Buccinator origin

maxilla and mandible

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5

Buccinator insertion

fascia at corner of the mouth

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6

buccinator action

compress the cheeks

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7

temporalis origin

temporal fossa

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8

temporalis insertion

coronoid process and ramus of mandible

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9

temporalis action

bilaterally: elevation, retrusion unilaterally: ipsilateral lateral deviation

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10

masseter origin

Zygomatic arch of temporal bone and zygomatic process of maxilla

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11

masseter insertion

Angle of ramus and coronoid process of mandible

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12

masseter action

Bilaterally: elevation Unilaterally: ipsilateral lateral deviation

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13

medial pterygoid origin

Lateral pterygoid plate of the sphenoid bone and tuberosity of the maxilla

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14

medial pterygoid insertion

ramus and angle of mandible

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15

medial pterygoid action

bilateral: protrudes and elevates mandible unilateral: contralateral lateral deviation

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16

lateral pterygoid origin

lateral pterygoid plate and greater wing of sphenoid

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17

lateral pterygoid insertion

Mandibular condyle and articular disk

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18

lateral pterygoid action

bilateral: protrudes and depresses mandible unilateral: contralateral lateral deviation

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19

What are the suprahyoid muscles?

digastric, stylohyoid, mylohyoid, geniohyoid

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20

suprahyoid muscles action

assist in depressing mandible

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21

What are the infrahyoid muscles?

omohyoid, sternohyoid, sternothyroid, thyrohyoid

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22

What are the infrahyoid muscle action

Stabilize the hyoid bone

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23

internal intercostal muscles origin

Ribs below

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24

internal intercostal muscles insertion

Ribs below

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25

internal intercostal muscles action

depress ribs during expiration

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26

external intercostal muscles origin

Ribs above

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27

Eternal intercostals insertion

Ribs below

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28

external intercostal muscles action

Elevate ribs in forced inspiration

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29

diaphragm origin

xiphoid process, ribs, lumbar vertebrae

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30

diaphragm insertion

central tendon

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31

diaphragm action

inspiration

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