difference between "skull" and "cranium"?
skull= 22 bones, encompasses cranium and mandible
cranium= doesn't include mandible; bones attached by sutures, so calvaria and viscerocranium
what comprises cranium?
1) calvaria - upper domed pt, covers cranial cavity containign brain
2) viscerocranium, facial skeleton- lower, anteiror pt
views of skull
1) norma lateralis
2) norma frontalis
3) norma verticalis
4) norma occipitalis
5) norma basalis
what is a branchial arch?
outpouchings of mesoderm on both sides of developing pharynx
develops during week 4
each archy develops its own artery, nerve controlling a distinct muscle group, and skeletal tissue
1st branchial arch's nerve?
trigeminal, CN V
2nd branchial arch's nerve?
facial, CN VII
3rd branchial arch's nerve?
glossopharyngeal, CN IX
4th branchial arch's nerve?
vagus, CN X
superior laryngeal nerve
5th & 6th branchial arches' nerve?
cranial root fo spinal accessory n (CN XI) fibers carreid in recurrent laryngeal nerve (of Vagus, CN X)
major sensory nerve of the face, its divisions, their fiber types?
trigeminal nerve (CN V)
V1 = opthalmic division, GSA
V2 = maxillary division, GSA
V3 = mandibular division, GSA & SVE
what nerve exits skull thru foramen ovale?
V3, mandibular division of trigeminal n (CN V)
which hole is foramen ovale?
where CN V, trigeminal n, exits skull
what nerve supplies muscles of facial expression?
CNVII, facial n
what nerve traverses parotid duct? why clinically important?
CN VII, facial n
traverses parotid duct, but doesn't innervate parotid gland
parotid gland innervated by CN IX, glossopharyngeal n
however tumors in area of parotid gland may cause facial pain on involved side
distinguishing feature of facial artery? fxn?
accomodates neck movements
aka "anaesthetist's artery"
what is facial artery direct branch of?
external carotid a
aorta > common carotid a > external carotid a > facial a
where is mental foramen? what nerve emreges from it? fiber type of said nerve?
2 holes on anterior surface of mandible
mental n emerges - branch of trigeminal n (CN V)
trigeminal > mandibular, V3 > inferior alveolar > mental
GSA and SVE fibers
what is a suture? why not always visible in adults?
suture is seam-like immovable fibrous joint btwn 2 bones
when skull/brain grow to adult size, sutures calcify, bones fuse, no longer visible