LA Head Structures Flashcards
Through which foramen does the frontal n come out through in the horse cranium?
Supraorbital foramen
What is the space in the oral cavity where there is no teeth?
Diastema
How can you determine the location of the infraorbital foramen in the horse?
By drawing a line from facial crest and nasoincisive notch, it will be in the middle
T/F equine skulls have a complete bony orbit
true
T/F horses have a masseteric fossa
False
Where is the frontal bone longer, equine or bovine?
Bovine
The frontal and caudal maxillary sinus drain into:
frontomaxillary opening
The maxillary sinus is divided into:
rostral and caudal
What separates the maxillary sinuses and what is the clinical significance?
Bony septum, associated with teeth and changes with age
What is the sinus caudal to the maxillary sinus?
Sphenopalatine
Through the rostral and caudal maxillary sinus, what 2 important structures pass through them?
Maxillary n and infraorbital n
T/F : Maxillary sinuses communicate
False, separated by an oblique septum
What are the limits for the trephination of the maxillary sinus in the horse?
- Dorsal: line from medial canthus of eye to infraorbital foramen
- ventral: facial crest
What sinus is associated with the cornual divertuculum?
Frontal sinus
What is the expansion of the maxillary sinus that “bubbles” into the orbit in bovine and rabbits?
Lacrimal bulla
The optic canal is associated with the
optic n
What nerves go through the orbital fissure?
CN III, 4, 6, V1
The rostral alar foramen is associated with ?
Maxillary a and n
What 3 things make up the foramen orbitorotundum in bovine?
orbita fissure/rostral alar foramen/round foramen
What nerves go through the foramen orbitorotundum?
3, 4, V1, V3, 6
Foramen lacerum in equine is made up of: ___________, _____________, ____________
oval foramen, tympano occipital foramen, jugular foramen
Where does the spinal cord go out of in the skull?
Foramen magnum
What bone divides the guttural pouch in to medial and lateral?
Stylohyoid bone
What structures are associated with the Medial Guttural pouch?
ICA and CN 9-11 +/- 12
What structures are associated with the lateral guttural pouch?
ECA and CN 7
What structure runs UNDER the masseter in equine (in the dog it run between the ventral and buchal branches of CN VII)?
Parotid duct
List the muscles of mastication
- Digastricus
- Pterygoid
- Masseter
- Temporal
What nerve innervates the muscle of mastication?
CN V3
The caudal belly of the digastricus is innervated by: _________
CN 7
What muscle of mastication opens the jaw?
Digastricus
What is the function of the Pterygoid?
Close the jaw
The muscles of facial expression are innervated by the ?
CN 7
What muscle depresses the lips?
Depressor labialis inferioris
