Canine Head Flashcards
What is the Dog Cephalic Index Formula
(100 x skull width)/ skull length
Dogs with a Dog cephalic index less than 50 are considered
Dolichocephalic
Dogs with a Dog cephalic index greater than 100 are considered
Brachycephalic
Dogs with a dog cephalic index of 50-100 are considered
Mesaticephalic
4 palpable superficial structures are
Infraorbital foramen
Mental foramen
Nuchal and Sagittal Crest
Zygomatic arch/Mandible
Define mimetic muscles
Superficial facial expression muscles; associated w/ hyoid apparatus
What are the 6 mimetic muscles
1) Orbicularis oris
2) Orbicularis oculi
3) Caninus
4) Buccinator
5) Levator nasolabialis
6) Levator labii superioris
Which cranial nerve supplies the mimetic muscles
Facial nerve; CN VII
What are the 3 branches of CN VII (Facial n.) that are involved in facial nerve paralysis
1) Palpebral n.
2) Dorsal Buccal n.
3) Ventral Buccal n.
3 clinical signs of facial nerve paralysis in dogs and the muscle affected
1) Inability to close eyes- Orbicularis Occuli m.
2) Food in vestibule- Buccinator m.
3) Dropped ear- Rostral and Caudal auricular m.
What are the general functions of mastication muscles
To provide and maintain jaw tone
Name the 4 mastication muscles
1) Temporalis
2) Masseter
3) Pterygoid (Lateral and Medial)
4) Digastricus
What is the function of the Lateral/Medial Pterygoid m.
They close and drop the jaw
Which nerve innervates the Lateral/Medial Pterygoid m.
Mandibular n.
What is the specific function of the digastricus m.
Open the jaw
Which nerve innervate the Caudal portion of the digastricus m.
Facial n.
Which nerve innervates the Rostral portion of the digastricus m.
Mandibular n.
What is another name for “Mandibular nerve paralysis”
Dropped jaw
Where does the parotid salivary gland duct open
Against the upper 4th premolar
Location of the Parotid lymph node and what it drains
Rostral to parotid salivary gland; drains the superficial structures dorsal to palate
Where does the mandibular salivary gland open up
At the sublingual caruncle
Where is the mandibular lymph node located and what does it drain
In the intermandibular space; drains superficial structures
Where does the monostomatic sublingual salivary gland open
At the sublingual caruncle
Where does the polystomatic sublingual salivary gland open
At the sublingual fold
Where does the zygomatic/buccal salivary gland open
Against the upper 2nd molar
Where do all of the lymph nodes of the head drain to
First, into the medial retropharyngeal lymph node and then the tracheal duct