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2/15 quiz LAB

2/15 quiz LAB - skull

compact bone solid bone outside of skeleton
compact bone composed of osteons
center tunnel of each osteon for blood vessels haversian canal
extends perpendicular from haversian canal. connects blood vessels from adjacent osteons volkmann's canal
concentric rings of bony matrix composed of collagen fibers and calcium salt crystals lamellae
between lamellae find osteocytes (bone cells)
osteocytes live inside lacunae (shells)
tunnels radiating out of individual lacuna canaliculi
small spaces between osteons filled with small bony matrix sheets - between rings interstitial lamellae
lacks distinctive structure of compact bone found on the interior skeleton. osteon arrangement not present. cancellous bone
cancellous bone is composed of small spikes of bony matrix called trabeculae
skull, vertebral column, ribs, sternum axial skeleton
arms, legs, pelvic girdle, shoulder girdle appendicular skeleton
represent points of attachment for muscles, joint surfaces, openings for various blood vessels, & nerves to enter and leave the skull surface markings
rounded hole foramen
slit-like hole fissure
tube-like hole meatus
hollow space sinus
bump tuberosity
crest or line ridge
groove sulcus
dpression fossa
joint surface condyle, head, facet
portion of skull houses the brain cranium
brain lies within cranial cavity (vault)
large bone forms forehead region frontal bone
bony eye socket orbit
directly posterior to the frontal bone. paired bones form the upper central portion of skull & cranial cavity parietal bones
directly inferior to parietal bones and form the sides of the skull and the lowers sides and portion of the floor of cranial cavity temporal bones
large bump lies just behind the ear mastoid process
found in skull interior and forms large "mountain" on the floor of cranium. houses internal ear structures petrous ridge
anterior to the mastoid process. spike like projection styloid process
anterior to the mastoid process tube-like hole. holds tube that sound waves travel to the internal ear structures external auditory meatus
thin bony projection that extends anteriorly zygomatic process
thin bony projection extending anteriorly joins similar posterior extention of a bone from the face zygomatic arch
small opening located in the ridge portion of temporal bone from inside of skull (path for nerve from inner ear to brain) internal auditory meatus
openings that can be viewed from both inside and inferior aspect of skull. rather large openings allow blood to drain from brain to the heart jugular foramen
provides opening for carotid artery to enter cranial cavity carotid canal
temporal bones consist of (7) mastoid process, petrous ridge, styloid process, external & internal auditory meatus, zygomatic process & arch, jugluar foramen, carotid canal
forms posterior wall and portion of floor of cranial cavity with several surface markings occipital bone
occipital bones consist of (2) foramen magnum, occipital condyles
largest hole in the skull where spinal cord exits the cranium to vertebral column foramen magnum
lateral to foramen magnum two rounded articular (joint) surfaces. form a joint with the first vertebra in spinal column occiptal condyles
large, oddly shaped bone can be seen from inside or from inferior aspect. bat-shaped extends from one temple to the other. can be seen forming the back & lateral portions of orbit sphenoid bone
sphenoid bone consists of (2) sella turcica & optic canal
prominent landmark can be easily seen from inside cranium. "thurkish saddle" home to pituitary gland sella turcica
rounded tunnel extending from orbit into cranial cavity accomodated optic nerve as it travels from eyeball to brain optic canal
lies between and forms medial wall of the orbits ethmoid bone
ethmoid bone consists of (5) perpendicular plate, crita galli, cribriform plate, middle & superior nasal conchae
superior (upper) portion of nasal septum divides nasal cavity into left & right parts perpendicular plate
from inside cranial cavity, ridge near the front of cranial cavity serves as attachment point for membranes that surround the brain crista galli
on either side of crita galli is a perforated, scree-like structre. Tiny holes in this grid allow olfactory nerve to enter brain tissue from nasal cavity region cribriform plate
upper scroll like bones on lateral sides of nasal cavities middle and superior conchae
squiggly line joints sutures
soft spots fontanels
form anterior portion of skull facial bones
form superior portion of nasal region nasal bones
bone that forms the upper jaw maxilla
upper teeth maxillary teeth
inferior to the orbit. passage for trigeminal nerve, a major nerve associated with face structures infraorbital foramen
maxilla consists of (2) maxillary teeth & infraorbital foramen
inferior to the maxilla is a movable bone, forms lower jaw mandible
lower teeth mandibular teeth
articulation between temporal bone & mandible, lies just anterior to external aud meatus temporomandibular joint
mandible bend angle
flat portion of mandible extends inferiorly from temporomandibular joint to the angle of the mandible ramus
mandible consists of (4) mandibular teeth, temporomandibular joint, angle, ramus
lateral to maxilla "cheekbone". zygomatic bone
tiny orbit bone. lies at medial aspct of the orbit and has small openings into lacrimal duct, which carries tears from the eye to nasal area lacrimal bone
inferior scroll like bones lateral to nasal area inferior nasal conchae
posterior to maxilla portion are two small bones forming 1/4 of hard plate palatine bones
superior to palatines bones within nasal cavity - small wedgle shaped bone. inferior portion of nasal septum vomer
u shaped bone thats not really attached hyoid bone
thicker bones have been hollowed to make skull lighter paranasal sinuses
Created by: la66