Musculature of the Face Flashcards
What is the origin and insertion of the buccinator?
origin: maxilla, mandible, and pterygomandibular raphae
insertion: angle of mouth
What is the function of the buccinator?
forms anterior portion of cheek
What is the origin and insertion of the masseter (superficial head)?
origin: anterior 2/3 and inferior border of zygomatic arch
insertion: lateral surface of mandible
What is the function of the masseter (superficial head)?
elevates (closes) mandible
What is the origin and insertion of the masseter (deep head)?
origin: posterior 1/3 and medial surface of zygomatic arch
insertion: lateral surface above angle of mandible
What is the function of the masseter (deep head)?
elevates (closes) mandible
What is the origin and insertion of the lateral pterygoid (superior head)?
origin: inferior surface of greater wing of sphenoid
insertion: pterygoid fovea under the condyloid process, fibrous capsule of TMJ
What is the function of the lateral pterygoid (superficial head)?
Lowers (opens) mandible, lateral movement of mandible, protrusion of mandible
What is the origin and insertion of the lateral pterygoid (inferior head)?
origin: lateral surface of lateral pterygoid plate
insertion: pterygoid fovea under the condyloid process, fibrous capsule of TMJ
What is the function of the lateral pterygoid (inferior head)?
lowers (opens) mandible, lateral movement of mandible, protrusion of mandible
What is the origin and insertion of the medial pterygoid?
origin: medial surface of lateral pterygoid, pterygoid fossa
insertion: medial surface angle of mandible
What is the function of the medial pterygoid?
elevates (closes) mandible
What is the origin and insertion of the temporalis?
origin: temporal fossa
insertion: coronoid process of mandible
What is the function of the temporalis?
elevates (closes) mandible, posterior portion retracts mandible
What does the maxillary artery supply?
nasal cavity, lateral wall and roof of oral cavity, all teeth, dura mater of cranial cavity
What is the course of the maxillary artery?
originates from external carotid within the parotid gland, moves forward between the neck of the mandible and sphenomandibular ligament, enters the infratemporal fossa, exits through pterygomaxillary fissure, enters pterygomaxillary fossa
What branches from the maxillary artery in its first part (between neck of mandible and sphenomandibular ligament)?
1) MIDDLE MENINGEAL
2) INFERIOR ALVEOLAR
3) deep auricular
4) anterior tympanic
5) accessory meningeal
What branches from the maxillary artery in its second part (associated with lateral pterygoid muscle)?
1) deep temporal
2) masseteric
3) buccal
4) pterygoid
What branches from the maxillary nerve in its third part (in pterygopalatine possa)?
1) POSTERIOR SUPERIOR ALVEOLAR
2) INFRAORBITAL
3) GREATER PALATINE
4) pharyngeal
6) sphenopalatine
7) artery of the pterygoid canal
Where is the pterygoid plexus located?
in the infratemporal fossa between the medial and lateral pterygoid muscles and between the temporalis and lateral pterygoid
What are the functions of the pterygoid plexus?
1) return deoxygenated blood from face back to heart via maxillary vein and int. and ext. jugular veins (areas supplied by maxillary artery or its branches)
2) protect maxillary artery, which travels through the plexus, by filling with blood during or emptying during jaw movements
