cranial floor, sinuses, the mandible and the fetal skull

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cranial floor

internal, bottom surface of the cranium

cranial fossae contains

ant. cranial fossa, post. cranial fossa, middle cranial fossa

ant. cranial fossa

formed by the orbital planes of the frontal bone and ethmoid bone

post. cranial fossa

large depression made up mostly of the occipital bone ; deepest and largest of the3 fossa

middle cranial fossa

loc. b/t ant. & post.cranial fossa

ethmoid bone contains

cribriform plate; crista gali

ethmoid bone is located

in the ant. fossa

cribriform plate

1) lies horozonally 2) its perforated 3) holes/ openings passageway for olafactory nervers from the nose to the brian

crista gali

upward projecting portions of bone from the midlline of the cribriform plate

optic foramina

1) pair of openings ant. to to the sella turcica 2) serves as an entrence/ exit to optic canal (3) optic nerve- passes thro these openings

chaismatic groove

narrow self extending from 1 optic foramina to the other

superior orbital fissure

(1) jagged opening loc. under ant. clinoid process (2) passageway for a set of cranial nerves and blood vessels

frontal bone contains

foramen cecum

frontal bone is loc

in the ant fossa

foramen cecum

small single opening ant to the ethmoid bone

sphnoid bone makes up

the middle fossa

sphnoid bone shaped like

a bat

sphnoid bone contains

smaller wing of sphenoid

smaller wing of sphenoid

the ant./lat points of the "bat wings"

hypophyseal fossa

(1) deep depression on the midline of the middle fossa (2) on post. portion of sphenoid bone (3) contain pituitary gland

dorsum sella

(1) directly post. to hypophyseal fossa (2) point project backwards

post. clinoid processes

the 2 outer pointy processes of the dorsum sella

sella turcica (turkish saddle)

consists of the above 4 structures

foramen rotundum

(1) arched opening post. of the sup. orbital fissure (2) passageway for a maxillary branch of cranial nerves ( trigeminal nerves)

temp. bone ( middle fossa) contains

squamous portion, petrous portion, mastoid part

squamous portion

thin portion that forms a part of the lat. surf of cranium

retrous portion

(a) hardest thickest portion of the cranium (b) internal acusticmeatus

internal acusticmeatus

loc on the medial surf of petrous portion internal opening of ear canal

mastoid part

(a) most post portion (b) loc. below petrous port (c) mastoid foramen (d) mastoid process

mastoid foramen

sm opening ant to the depression of the mastoid process

mastoid process

(fossa) on the internal surf. but a proc on the external surf appers as a depression

occipital bone contains

depression of the transversal sinus,

occipital bone facts

makes up the post fossa; appears as inf/sup nuchal lines on the external surf

paranasal sinuses

cavities which lighten the skull w/o weakening it; all of the sinuses have passageways leading to the nasal and oral cavities; there are 4 sets of paranasal sinuses

4 sets of paranasal sinuses

frontal sinuses ; maxillary sinuses ; sph. sinuses ; ethmoid sinuses/ air cells

frontal sinuses

loc above the eyes w/in the frontal bone

maxillary sinuses

largest sinuses , on each side of the nose and below the eyes; AKA antrums of highmore

sph. sinuses

most post of sinuses; loc w/in the sph bone; directly post to maxillary sinuses

ethmoid sinuses/ air cells

loc b/t frontal and sph. sinuses; appears as a group of small openings

the mandible

only movable bone of the skull; lower jaw bone; composed of two portions

two portions of mandibles

body- the single horizonal portion; ram/ ramous-the 2 vertical portions

symphysis (sdm)

point of fusion on the midline of the body of the mandible

incisive fossae (sdm)

2 small depressions on each side of the symphysis

mandibular condyle (sdm)

rounded process on the post/ sup portion of each ram; articulates w/the mandibular fossa on the temporal bone

coronoid processes (sdm)

pointed proc loc directly ant to mandubular condyle

mandibular notch (sdm)

the gap b/t the mandibular condyle and coronoid proc

angles (sdm)

the point where the body and the rami meet

oblique line (sdm)

a raised ridge of bone that extends from the rami down to the body on the external surf of the mandible

mylonyoid line (sdm)

a raised ridge of bone that extends from the rami down to the body on the internal surf of the mandible

alveolar process (sdm)

the raised portion of the mandible along the body that contains the teeth (gums)

mandibular foramina (sdm)

foramen loc on the internal surf of each rami

mental foramen (sdm)

foramen loc on the external surf of body; one on each side of the body

fetal skull

skull is not completley ossified at birth

fontanels

soft spots (a) un-ossified membranous areas of the fetal skull (b) undicated by a jagged line(c) eventually becomes a fused joint or suture

fontanels allow

allow the cranial bones to overlap during a normal vaginal delivery; ossification of a childs skull is complete around the age of 2; 6 total

the 6 fontanels

anterior fontanel; post fontanel; aterolateral; posterolateral

anterior fontanel

diamond shaped; most ant on the midline; at the junction of the frontal and parietal bones

post fontanel

diamond shaped but smaller than ant fontanel; lies on te midline at the junction of teh parietal and occipital bones

aterolateral fontanels

2 loc on each side of the skull; loc at the lat end of the coronalsuture

posterolateral fontanels

2 loc on each side of the skull; loc at the lat ends of the lamboidal suture

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