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Equine/etc. Skull
Large animal skull questions
27
Anatomy
Graduate
05/20/2011

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Term
What 2 bones form the brain case in the horse?
Definition
Mostly parietal, some frontal.
Term
How many points does the equine nasal bone have? Cow? Sheep? Goat?
Definition
Horse and Sheep: 1
Cow and Goat: 2
Term
How can you locate the supraorbital foramen by palpation in a live horse?
Definition
Palpate the orbital rim (zygomatic process of frontal bone) and where it begins to widen, the foramen is found in the middle.
Term
What 2 nerves can be blocked at the supraorbital foramen? Would you need to block at any additional point(s)?
Definition
Frontal branches of opthalmic of V and Palpebral of VII are blocked at the supraorbital foramen. Due to the variable course of the palpebral, doing a block along the dorsal margin of the zygomatic arch is not a bad idea.
Term
Why is it impossible to perform an ocular exam on a horse w/o nerve block?
Definition
Eye muscles (orbicularis oculi) are very strong, largely due to attachment at prominent lacrimal tubercle (bony projection rostral to orbit).
Term
Where does the facial crest terminate?
Definition
At PM4.
Term
What are the 4 clinical significances of the facial crest in the horse?
Definition
1) Can use to locate pulse at caudal end of crest (transverse facial artery).
2) Just ventral to crest under orbit is site for blood sampling (facial vein)
3) Trephination of maxillary sinus should be performed dorsal to facial crest.
4) End of crest rostrally marks rostral end of rostral maxillary sinus (and beginning of nasal cavity).
Term
Where do the lamellar and funicular parts of the nuchal ligament attach?
Definition
Lamellar: nuchal crest
Funicular: External occipital protuberance (just under nuchal crest)
Term
What muscles attach to the jugular (paracondylar) processes of the equine skull?
Definition
Occipital mandibularis
Digastricus
Term
What muscles attach to the muscular process near the styloid process of the temporal bone?
Definition
Tensor veli palatini
Levator veli palatini
Term
What muscles attach at the tubercles near the suture line of the basisphenoid and basioccipital bone?
Definition
Longus capitis
Rectus capitis ventralis
(Clinical note: rearing head can lead to fracture at this weak suture and perforation of cavernous venous sibus above).
Term
Where is the jugular foramen located in the horse, and what does it transmit?
Definition
Located at the caudal part of the foramen lacerum. Transmits CN IX, X, and XI.
Term
What are the 3 notches in the cranial part of the foramen lacerum?
Definition
Medial notch = carotid notch (for internal carotid a.)
Middle notch = oval notch (for mandibular n. of CN V) - no oval foramen in horse!
Lateral notch = spinous notch (for middle meningeal artery)
Term
What are the only 2 animals having an alar canal?
Definition
Horse and dog.
Term
What 3 foramina are in the alar canal?
Definition
1) Orbital fissure (for 3, 4, opthalmic of 5, and 6 CNs)
2) Combined round foramen (for mandibular of V) and rostral alar foramen (.
Term
What 2 foramina are next to the large alar canal entrance?
Definition
Ethmoid foramen (small, oval - for ethmoid blood vessel and ethmoid branches of opthalmic of V) and optic canal (larger, for optic n.).
Term
Which 3 foramina are found in the pterygo-palatine fossa (ventral to orbit)?
Definition
1) Caudal palatine foramen (for entry of palatine vessels)
2) sphenopalatine foramen to nasal cavity (for caudal nasal nn and vessels)
3) Maxillary foramen - beginning of intraorbital canal.
Term
Which teeth are related to the maxillary sinus?
Definition
PM4, M1, M2, M3. (PM4 and M1 are usu. in rostral max. sinus, and M2 and M3 are in caudal max. sinus)
Term
What is the wolf tooth?
Definition
PM1 on maxilla, occasionally present.
Term
The rostral frontal sinus communicates with which other sinus?
Definition
Dorsal conchal sinus. Together they are called the conchofrontal sinus.
Term
What does the frontmaxillary aperture connect?
Definition
Frontal sinus with caudal maxillary sinus. A large aperture present only in horse.
Term
What separates rostral from caudal maxillary sinus?
Definition
Oblique septum (position is variable).
Term
For trephination of rostral maxillary sinus, where should the opening be made?
Definition
Caudal to rostral termination of facial crest and ventral to a line drawn from medial canthus of eye to infraorbital foramen (to avoid infraorbital nn and lacrimal duct).
Term
The caudoventral conchal sinus is A.K.A. what?
Definition
Medial compartment of the rostral maxillary sinus.
Term
The caudal maxillary sinus is in communication with what other sinus?
Definition
Sphenopalatine sinus.
Term
How do you avoid the large veins when attempting to trephine the frontal sinus?
Definition
Palpate the supraorbital foramen and groove, which is where the veins are located.
Term
What extends into the bovine lacrimal bulla?
Definition
Caudal maxillary sinus
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