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Bones of the Skull.

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Presentation on theme: "Bones of the Skull."— Presentation transcript:

1 Bones of the Skull

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

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

4 Neurocranium (cranial bones)
frontal parietal temporal sphenoid ethmoid occipital

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

6 Frontal supraorbital foramen glabella

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

8 Parietal sagittal suture lambdoid suture

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

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

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

12 Temporal glenoid lamboid fossa suture external zygomatic auditory
meatus zygomatic process styloid process mastoid process

13 Sphenoid single bone wedge or butterfly shaped
situated on cranial floor central depression called sella turcica - surrounds pituitary gland articulates with cranial bones

14 Sphenoid

15 Ethmoid single anterior part of cranial floor between orbits
anterior to sphenoid posterior to nasal bones primary supporting bone of nasal cavity

16 Ethmoid

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

18 Occipital

19 Viscerocranium (facial bones)
nasal vomer inferior nasal conchae lacrimal maxilla palatine zygomatic mandible

20 Nasal paired oblong bones side by side in midline forms bridge of nose
major portion of the nose consists of cartilage

21 Vomer single, triangular in lower back of nasal cavity
forms portion of septum partition of two nasal chambers

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

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

24 lacrimal nasal conchae vomer

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

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

27 Cleft Palate Cleft Lip failure of palatine processes to unite
at about weeks of embryonic development repair - between age one and age 2 Cleft Lip split in the upper lip repair - first year of life

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

29 Palatine Bone

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

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

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

33 zygomatic maxilla mandible

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

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