Post on 22-Jan-2016
Suzanne D'Anna 1
Bones of the Skull
Suzanne D'Anna 2
Sutures immovable joints found only between
bones of the skull coronal - found between the frontal and
the two parietal bones sagittal - between the two parietal bones lambdoid - between the parietal and
occipital bones squamous - between the parietal and the
temporal bones
Suzanne D'Anna 3
Fontanels (little fountain)
infancy membrane filled spaces found between cranial bones at birth eventually replaced by bone (about age 2) Functions:
- enable the fetal skull to modify shape during birth process
- permit rapid growth of brain during
Suzanne D'Anna 4
Neurocranium (cranial bones)
frontal parietal temporal sphenoid ethmoid occipital
Suzanne D'Anna 5
Frontal unpaired (single bone) forms anterior part of the cranium (forehead) roof of the orbits most of anterior part of cranial floor smooth portion between orbits
- glabella each bony ridge perforated by
- supraorbital foramen contains frontal sinuses
Suzanne D'Anna 6
Frontal
glabella
supraorbitalforamen
Suzanne D'Anna 7
Parietal paired, posterior to frontal bone forms sides and roof of cranium bones meet at midline to form
- sagittal suture posteriorly, bones merge with occipital bone to form
- lambdoid suture lateral sides of skill merge with temporal bone to
form
- squamous suture
Suzanne D'Anna 8
Parietalsagittal suture
lambdoid suture
Suzanne D'Anna 9
Temporal paired forms sides and base of skull has pit or depression
- mandibular or glenoid fossa
(site of articulation with mandible) sharp projections on underside
- styloid process
Suzanne D'Anna 10
Temporal (cont.)
rounded projection at back:
- mastoid process has canal on lateral sides
- external auditory meatus suture that connects occipital with
parietal
- lambdoid suture
Suzanne D'Anna 11
Temporal (cont.) zygomatic process projecting from inferior
- articulates with temporal process of
zygomatic bone zygomatic process of temporal bone and
temporal process of zygomatic bone make up zygomatic arch
Suzanne D'Anna 12
Temporalglenoidfossa
externalauditorymeatus
mastoid process
zygomaticprocess
styloidprocess
lamboidsuture
Suzanne D'Anna 13
Sphenoid single bone wedge or butterfly shaped situated on cranial floor central depression called sella turcica
- surrounds pituitary gland articulates with cranial bones
Suzanne D'Anna 14
Sphenoid
Suzanne D'Anna 15
Ethmoid single anterior part of cranial floor between
orbits anterior to sphenoid posterior to nasal bones primary supporting bone of nasal cavity
Suzanne D'Anna 16
Ethmoid
Suzanne D'Anna 17
Occipital single posterior and base of cranium (base and
back) has large opening called foramen magnun
(through which spinal cord passes) occipital protuberance is midway between
top and foramen magnum occipital condyles articulate with atlas
Suzanne D'Anna 18
Occipital
Suzanne D'Anna 19
Viscerocranium (facial bones)
nasal vomer inferior nasal conchae lacrimal maxilla palatine zygomatic mandible
Suzanne D'Anna 20
Nasal paired oblong bones side by side in midline forms bridge of nose major portion of the nose consists of
cartilage
Suzanne D'Anna 21
Vomer single, triangular in lower back of nasal cavity forms portion of septum partition of two nasal chambers
Suzanne D'Anna 22
Inferior Nasal Conchae (KONG-ke)
paired thin, spongy looks rolled or coiled lateral wall of each nostril function to increase interior surface area
of the nose also called turbinate bones
Suzanne D'Anna 23
Lacrimal (lacrima = tear)
paired thin bones in anterior wall of orbit inner angle of eye directly behind frontal process of maxilla lacrimal duct passes through smallest of facial bones
Suzanne D'Anna 24
lacrimal
vomer
nasalconchae
Suzanne D'Anna 25
Maxillae paired bones join at midline to form upper jaw articulates with all bones of face except
mandible form part of floor of orbits form lateral walls and floor of nasal cavity contain inferior orbital foramen contain maxillary sinus which empty into nasal
cavity
Suzanne D'Anna 26
Maxillae (cont.)
forms most of hard palate contains alveolar process
- arch that contain alveoli (sockets) for maxillary (upper) teeth
contains palatine process
- horizontal projection on maxilla anterior 3/4 of hard palate
maxillary bones unite before birth
Suzanne D'Anna 27
Cleft Palate failure of palatine processes to unite
at about 10-12 weeks of embryonic development
repair - between age one and age 2
Cleft Lip split in the upper lip repair - first year of life
Suzanne D'Anna 28
Palatine Bones paired L-shaped form posterior portion of hard palate part of the floor and lateral wall of the
nasal cavity small portion of floors of the orbits
Suzanne D'Anna 29
Palatine Bone
Suzanne D'Anna 30
Zygomatic paired form prominences of the cheeks part of lateral wall and floor of each orbit also known as malars temporal process of zygomatic bone
projects posteriorly and articulates with zygomatic process of temporal bone
- together form zygomatic arch
Suzanne D'Anna 31
Mandible (mandere = to chew)
single bone, lower jaw largest, strongest facial bone only movable bone of skull (except ear
ossicles) contains alveolar process
- arch that contain alveoli (sockets) for mandibular (lower) teeth
Suzanne D'Anna 32
Mandible (cont.)
body; curved horizontal portion two perpendicular portions: (rami) condyloid process articulates with temporal
bone coronoid process attaches to temporalis
muscle mandibular angles mental and mandibular foramen
Suzanne D'Anna 33
zygomatic
maxilla
mandible
Suzanne D'Anna 34
Hyoid Bone (hyoedes = U-shaped) single bone does not articulate with any other bone suspended from styloid process by
ligaments and tendons located in neck between mandible and larynx supports tongue; attachment for muscles of
neck and pharynx consists of body and projections often fractured during strangulation