Muscles Of The TMJ Flashcards
Temporalis
O: Temporal fossa I: coronoid process and Ramus of the mandible A: Elevates the mandible @ TMJ’s Retracts the mandible @ TMJ N: The Trigeminal nerve CNV
Masseter
O: Inferior margin of Zygomatic bone and arch of temporal bone
I: Angle, Ramus and coronoid process of mandible
A: elevates the mandible @ TMJ
Protracts the mandible @ TMJ
Retracts the mandible @ TMJ
Lateral pterygoid
O: Entire muscle: sphenoid bone
I: mandible and TM joint
A: Protracts the mandible @ TMJ’s
Contralaterally deviates the mandible @ TMJ’s
N: Trigeminal nerve CN V
Lateral pterygoid nerve from anterior trunk of mandibular division
Medial pterygoid
O: Entire muscle: sphenoid bone
I: internal surface of the mandible
A: Elevates, Protracts and Contralateral deviates the mandible @ TMJ’s
N: Trigeminal nerve CNV mandibular division
Digastric (suprahyoid)
O: Post belly: Temporal bone - mastoid process
Ant belly: mandible - (digastric fossa)
I: central tendon bound to hyoid bone at body & greater Cornu
A: Depresses the mandible @ TMJ
Flexes the head and neck @ spinal joints
RMA: Elevates the hyoid bone
N: Ant: Trigeminal CNV and post:Facial nerve CNVII
Mylohyoid (suprahyoid)
I: Inner surface of mandible O: hyoid A: Depresses the mandible @ TMJ’s Flexes the head and neck @ spinal joints RMA: Elevates the hyoid bone N: Trigeminal nerve CNV
Geniohyoid (suprahyoid)
O: Inner surface of the mandible I: Hyoid A: Depresses the mandible @ TMJ’s Flexes the head and neck @ spinal joints RMA: Elevates the hyoid bone N: Hypoglossal nerve CNXII
Stylohyoid (suprahyoid)
O: Styloid process of temporal bone
I: Hyoid bone
A: elevates the hyoid bone
N: The Facial nerve CNVII
Sternohyoid (Infrahyoid)
O: Sternum I: hyoid A: Depresses the hyoid bone Flexes the neck and head @ spinal joints N: Cervical plexus
Sternothyroid (infrahyoid)
O: Sternum I: Thyroid cartilage A: Depresses the hyoid cartilage Flexes the neck and head @ spinal joints N: The cervical plexus
Thyrohyoid (infrahyoid)
O: Thyroid cartilage I: Hyoid A: Depresses the hyoid bone Flexes the neck and head @ spinal joints N: The Hypoglossal nerve (CNXII)
Omohyoid (Infrahyoid)
O: inferior belly: Scapula to the clavicle Sup belly: Clavicle to the body of hyoid A: Depresses the hyoid bone Flexes the neck and head @ spinal joints N: The cervical plexus
