Lab List Thursday 6/27/14

Question 0

Boundaries of temporal fossa

Answer 0

• posteriorly and superiorly: superior and inferior temporal lines
• anteriorly: frontal and zygomatic bones
• laterally: zygomatic arch
• inferiorly: infratemporal crest
• floor: parts of the four bones that form the pterion (frontal, parietal, temporal, greater wing of sphenoid
• roof: temporalis fascia (provides resistance of movement of masseter muscles)

Question 1

Temporal regions

Answer 1

temporal fossa, located superior to the zygomatic arch

infratemporal fossa, located inferior to the zygomatic arch

Question 2

Infratemporal fossa, what is it and boundaries?

Answer 2

• irregularly shaped space deep and inferior to the zygomatic arch
• boundaries:
  
  • laterally: ramus of mandible
  • medially: lateral pterygoid plate
  • anteriorly: posterior aspect of maxilla
  • posteriorly: tympanic plate, mastoid and styloid processes of
    temporal bone
  • superiorly: inferior surface greater wing sphenoid bone
  • inferiorly: pterygoid muscle attachment to mandible near its angle

Question 3

Contents of the infratemporal fossa

Answer 3

• inferior part of temporalis muscle
• lateral and medial pterygoid muscles
• maxillary artery
• pterygoid venous plexus
• mandibular, inferior alveolar, lingual, buccal, and chorda tympani nerves
• otic ganglion

Question 4

Maxillary artery

Answer 4

• larger of the two terminal branches of the external carotid artery
• major artery of the deep face

Question 5

Branches of the external carotid artery (inferior to superior)

Answer 5

• superior thyroid
• lingual
• facial
• occipital
• ascending pharyngeal
• posterior auricular
  (terminal branches)
  
  • maxillary
  • superficial temporal

Question 6

What nerve becomes the inferior dental plexus after entering the mandibular foramen?

Answer 6

inferior alveolar nerve

Question 7

Nerve to mylohyoid

Answer 7

small branch off of inferior alveolar nerve given off just before inferior alveolar nerve enters the mandibular foramen

Question 8

Mental nerve

Answer 8

passes through mental foramen to supply skin and mucous membrane of the lower lip, skin of chin, incisor teeth

Question 9

Lingual nerve

Answer 9

Branches off of the posterior branch of mandibular nerve, sensory to anterior 2/3 tongue, floor of mouth, lingual gingivae

Question 10

Chorda tympani nerve

Answer 10

• branch of CN VII
• presympathetic, parasympathetic secretomotor fibers for submandibular and sublingual salivary glands.
• joins lingual nerve in infratemporal fossa

Question 11

Temporomandibular joint type

Answer 11

modified hinge type of synovial joint

Question 12

Lateral ligament (intrinsic) and joint capsule of the temporomandibular joint

Answer 12

connect mandible to the skull by connecting head of mandible to areas on the zygomatic arch
- joint capsule connects closer to the postglenoid tubercle
- lateral ligament connects closer to the articular tubercle
They help to prevent posterior dislocation of the joint

Question 13

Stylomandibular ligament (extrinsic)

Answer 13

from the styloid process to the angle of the mandible, not very strong

Question 14

Sphenomandibular ligament (extrinsic)

Answer 14

• runs from the spine of the sphenoid to lingula of the mandible
• primary passive support and “swing rope” of the mandible

Question 15

Movement of the temporomandibular joint is mostly produced by

Answer 15

the muscles of mastication