Skull and Teeth Flashcards
When does the anterior fontanelle close?
18 months to 2 years
When does the posterior fontanelle close?
2-3 months
When does the sphenoidal fontanelle close?
6 months
When does the mastoid fontanelle close?
6 to 18 months
What are the two additional fontanelles which may be wrongly present at birth?
Metopic and sagittal fontanelle
What condition is the sagittal fontanelle associated with?
Down’s syndrome
What structures run through the cribiform plate?
Olfactory nerve, anterior ethmoidal nerves
What structures run through the optic canal?
Optic nerve, opthalmic artery
What structures run through the superior orbital fissure?
Lacrimal nerve Opthalmic division of the trigeminal nerve Superior opthalmic vein Trochlear nerve Oculomotor nerve Abducens
What structures run through the foramen rotundum?
Maxillary branch of the trigeminal nerve
What structures run through the foramen ovale?
Mandibular branch of the trigeminal nerve
What structures go through the foramen spinosum?
Middle meningeal artery
Middle meningeal vein
What structures go through the internal acoustic meatus
Facial nerve
Vestibulocochlear nerve
What structures go through the jugular foramen?
Glossopharngeal nerve
Vagus nerve
Accessory nerve
What goes through the hypoglossal canal?
Hypoglossal nerve
What are the 4 paranasal sinuses?
Frontal, sphenoid, ethmoid, maxillary
Which are the largest of the paranasal sinuses?
Maxillary
Where is the glabella?
Small depression medial to supraorbital ridges and superior to nasal bones
Where is the gnathion?
The most anterior-inferior, mid-sagittal point on the border of the mandible
Where is the gonion?
The most inferior, posterior and lateral point of the angle of the mandible
Where is the labrale inferiorus?
The point where the superior vermillion border meets the midsagittal plane
Where is the mentolabial sulcus?
Between the lower lip and the chin
Where is the menton?
Most posterior-inferior, mid-sagittal point on the border of the mandible
Where is the mid-nasal?
Mid point between superior and inferior border of nasal bone in midsagittal plane
Where is the mid-philthrum?
Mid-point between two vertical grooves under the nose
Where is the mid-ramus?
Mid-point between the condyle and the angle of the mandible
Where is the nasion?
Intersection between the frontonasal suture and midsagittal plane
Where is the pogonion?
The most projecting point in the mid-sagittal plane of the chin
Where is the prosthion?
The most anterior point on the maxillary alveolar process
Where is the rhinion?
Border of the nasal bone
Where is the subnasale
Where the nasal septum and upper lip merge in the mid-sagittal plane
Where is the vertex?
Where the 4 cranial bones meet
Where is the zygion?
Most lateral point of the zygomatic arch
When does the primary central incisor erupt?
8-12 months
When does the primary lateral incisor erupt?
12-24 months
When does the primary canine erupt?
16-24 months
When does the primary first molar erupt?
12-16 months
When does the primary second molar erupt?
24-32 months
When do the top and bottom permanent central incisiors erupt?
7-8 years
When do the top and bottom permanent lateral incisiors erupt?
bottom - 7-8 years
top - 8-9 years
When do the top and bottom permanent canines erupt?
bottom - 9-10 years
top - 11-12 years
When do the top and bottom permanent first premolars erupt?
9-10 years
When do the top and bottom permanent second premolars erupt?
bottom - 11-12
top - 10-12
When do the top and bottom permanent M1s erupt?
6-7 years
When do the top and bottom permanent M2s erupt?
bottom - 11-13
top - 12-13
When do the top and bottom permanent M3s erupt?
Between 17 and 25
