Lecture 13 - The Skull and Meninges

Question 1

how are bones of the skull formed, wha are sutures, major bones in the skull (8)

Answer 1

bones are formed from the mesenchyme by intramembranous ossification

sutures = the site of fusion of adjacent bones

major bones = frontal, parietal, temporal, occipital, ethmoid, maxilla, mandible, nasal

Question 2

what is dolichocephalic and brachycephalic

Answer 2

dolio = long and narrow skull. like afghans, greyhounds etc

brachy = shorter nasal compartment, alterations in sinuses, cranial shape. like pugs, bull dogs etc

Question 3

what happens at the foramen magnum

Answer 3

this is where the spinal cord exits

Question 4

what does the atlas articulate with, where does it sit

Answer 4

articulates with the occipital condyle. sits on either side of the foramen magnum

Question 5

normal dental formula (dog); maxillary teeth, mandibular teeth

Answer 5

maxillary (on each side); 3 incisors, 1 canine, 4 premolars (3 deciduous), 2 molars

mandibular; 3 incisors, 1 canine, 4 premolars (3 deciduous), 2 molars

Question 6

order and funcion of meninges layers

Answer 6

pia = shrink wrap, capillary network
arachnoid = where CSF gets absorbed
dura = tarp that covers

large vessels run in the arachnoid space

Question 7

meninges - what are the two major folds and where are they, what happens in them

Answer 7

two major folds exist in the meninges around the brain, composed of the dura mater and arachnoid

falx cerebri = in the longitudinal fissure between the cerebral hemispheres

tentorium cerebelli = in the transverse fissue separating cerebellum from cerebrum

these are the sites where much of the CSF that has circulated to the subarachnoid space is reabsorbed by structures called arachnoid granulations