Chapter 14 - TMJ Flashcards
Zygomatic bones
forms the prominence of the cheek and contributes the lateral wall and floor of the eye orbit
Maxillary bone
upper jaw, located in the middle part of the face and houses the upper teeth
Hyoid bone
horseshoe-shaped bone lying just superior to the thyroid cartilage at about the level of C3
Thyroid cartilage
largest of the bibe cartilages of the larynx
Lateral ligament or temporal mandibular ligament
Anteriorly, it attaches to the neck of the mandibular condyle and disk and then runs superiorly to the articular tubercle of the temporal bone
Sphenomandibular ligament
attaches to the spine of the sphenoid bone and runs to the middle of the ramus on the internal surface of the mandible
- suspends the mandible and limits excessive anterior motion
Stylodmandibular ligament
runs from the styloid process of the temporal bone to the posterior inferior border of the mandible’s ramus
- lies in between the masseter and medial pterygoid muscles and plays a role in limiting excessive anterior motion
Articular disk of the TMJ
similar to the articular disk of the sternoclavicular joint
- connected circumferentially to the capsule and tendon of the lateral pterygoid
Temporalis origin
temporal fossa
Temporalis insertion
coronoid process and ramus of mandible
Temporalis action - bilaterally
elevation, retrusion (posterior fibers)
Temporalis action - unilaterally
ipsilateral lateral deviation
Masseter origin
zygomatic arch of temporal bone and zygomatic process of axilla
Masseter insertion
angle of the ramus and coronoid process of mandible
Masseter action - bilaterally
elevation
Masseter action - unilaterally
ipsilateral lateral deviation
Masseter nerve
mandibular branch of trigeminal nerve (cranial nerve V)
Medial pterygoid origin
lateral pterygoid plate of the sphenoid bone and tuberosity of the maxilla
Medial pterygoid insertion
ramus and angle of the mandible
Medial pterygoid action - bilaterally
elevation, protrusion
Medial pterygoid action - unilaterally
contralateral lateral deviation
Medial pterygoid nerve
mandibular brach of trigeminal nerve (crainal nerve V)
Lateral pterygoid origin
lateral pterygoid plate and greater wing of the sphenoid
Lateral pterygoid insertion
mandibular condyle and articular disk
Lateral pterygoid action - bilaterally
depression, protrusion
Lateral pterygoid action - unilaterally
contralateral lateral deviation
Lateral pterygoid nerve
mandibular branch of trigeminal nerve (cranial nerve V)
Mylohyoid origin
interior medial mandible
Mylohyoid insertion
hyoid
Mylohyoid action
assists in depressing mandible
Mylohyoid nerve
branch of trigeminal nerve (cranial nerve V)
Geniohyoid origin
mental spine of mandible
Geniohyoid insertion
hyoid
Geniohyoid action
assist in depressing mandible
Geniohyoid nerve
C1 via hypoglossal nerve (cranial nerve Xll)
Stylohyoid origin
styloid process of temporal bone
Stylohyoid insertion
hyoid
Stylohyoid action
assists in depressing mandible
Stylohyoid nerve
branch of facial nerve (cranial nerve Vll)
Digastric origin - anterior
internal inferior mandible
Digastric origin - posterior
mastoid process
Digastric insertion
via pulleylike tendon to hyoid
Digastric action
assists in depressing mandible
Digastric nerve
mandibular branch of trigeminal nerve (cranial nerve V) and branch of facial nerve (cranial nerve Vll)
Sternohyoid origin
medial end of clavicle, sternoclavicular ligament, and manubrium of sternum
Sternohyoid insertion
inferior border of hyoid bone
Sternohyoid action
stabilize hyoid bone
Sternohyoid nerve
C1 to C3 via hypoglossal nerve (cranial nerve Xll)
Sternothryoid orign
manubrium of sternum and cartilage of the first rib
Sternothryoid insertion
thyroid cartilage
Sternothryoid action
stabilize hyoid bone
Sternothryoid nerve
C1 to C3 via hypoglossal nerve (cranial nerve Xll)
Thyrohyroid origin
thryoid cartilage
Thyrohyroid insertion
inferior border of hyoid bone
Thyrohyroid action
stabilize hyoid bone
Omohyoid origin
superior border of the scaoula
Omohyoid insertion
inferior border of hyoid bone
Omohyoid action
stabilize hyoid bone