Identify the boundaries of the infratemporal fossa.

Boundaries:Lateral=Ramus of MandibleAnterior=MaxillaMedial=Lat. Pterygoid PlateRoof=Sphenoid

Temporal

Maxilla

Parietal

Sphenoid

Frontal

Z

Lat. Pterygoid Plate

Pterygomaxillary Fissure

Infratemporal Fossa

Temporal Fossa

Identify the muscles of mastication, their sources of innervation and their major actions in chewing.

Temporalis

Masseter

Medial PterygoidBuccinator*

Lateral Pterygoid

* Innervated by Facial Nerve

During jaw opening the mandibular condyle and articular disc glide anteriorly onto the temporomandibular eminence.

•This is brought about by the action of the superior head of the lateral pterygoid muscle

The temporalis, masseter, medial pterygoid and the inferior head of the lateral pterygoid all participate in jaw closing.

•Side-to-side grinding is produced by cooperative actions of one masseter and the contralateral medial pterygoid.

Temporomandibular eminence

Articular disc

Identify the parotid, submandibular and sublingual salivary glands. Trace the course of their innervation and follow the flow of saliva from each gland to the mouth.

Inferior alveolar n.

Lingual n.

Facial n..

Submandibular ganglion.

Otic ganglion.Lesser petrosal n.

Chorda tympani

Auriculotemporal n.

Follow the course of the major nerves supplying structures and passing through the infratemporal fossa.

Facial

Greater petrosal

Pterygopalatine gang.

Internal carotid a.

Sup. Cervical gang.

N. of pterygoid canal

Deep petrosal

V2

V2

V3

V1

Innervation of the Lacrimal Gland

Trace the flow of blood through the maxillary artery and its major branches. Trace the flow of blood into the nasal and oral cavities.

Ext. Cartotid

Inf. AlveolarPost. Sup. Alveolar

Maxillary

Post. Deep TemporalAnt. Deep Temporal

Infra-orbital

Ext. Cartotid

Post. Deep TemporalAnt. Deep Temporal

Middle Meningeal

Septal brr.

Descending palatineGreater palatine Lesser palatine

SphenopalatineV3

Trace the flow of air into each of the paranasal sinuses, note the communication with the nasal cavity the relationships of each sinus to the oral, orbital and cranial

cavities.

Sup. Concha

Middle Concha

Inf. Concha

Sup. Concha

Inf. meatus

Ethmoid bulla of Middle meatus

Spheno-ethmoid recess

Sphenoidal sinus

Frontal sinus

Opening to Maxillary

Sinus

Sup. meatus

Identify the extrinsic and intrinsic muscles of the tongue, their innervation, and actions. Identify the muscles of the soft palate, their innervation and major actions.

Mandible (cut)

Hard Palate

Mylohyoid (cut)Hyoglossus

Stylohyoid

Hyoid Bone

Palatoglossus Palatopharyngeus

Stylopharyngeus

Genioglossus

Styloglossus

Geniohyoid

PalatopharyngeusPalatoglossus

Sup. Constrictor

Tensor veli palatiniLevator veli palatini

V3

IX

XII

Pharyngeal plexus

VII