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Suzanne D'Anna1 Bones of the Skull. Suzanne D'Anna2 Sutures immovable joints found only between bones of the skull n coronal - found between the frontal.

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Presentation on theme: "Suzanne D'Anna1 Bones of the Skull. Suzanne D'Anna2 Sutures immovable joints found only between bones of the skull n coronal - found between the frontal."— Presentation transcript:

1 Suzanne D'Anna1 Bones of the Skull

2 Suzanne D'Anna2 Sutures immovable joints found only between bones of the skull n coronal - found between the frontal and the two parietal bones n sagittal - between the two parietal bones n lambdoid - between the parietal and occipital bones n squamous - between the parietal and the temporal bones

3 Suzanne D'Anna3 Fontanels (little fountain) n infancy n membrane filled spaces n found between cranial bones at birth n eventually replaced by bone (about age 2) n Functions: - enable the fetal skull to modify shape during birth process - permit rapid growth of brain during

4 Suzanne D'Anna4 Neurocranium (cranial bones) n frontal n parietal n temporal n sphenoid n ethmoid n occipital

5 Suzanne D'Anna5 Frontal n unpaired (single bone) n forms anterior part of the cranium (forehead) n roof of the orbits n most of anterior part of cranial floor n smooth portion between orbits - glabella n each bony ridge perforated by - supraorbital foramen n contains frontal sinuses

6 Suzanne D'Anna6 Frontal glabella supraorbital foramen

7 Suzanne D'Anna7 Parietal n paired, posterior to frontal bone n forms sides and roof of cranium n bones meet at midline to form - sagittal suture n posteriorly, bones merge with occipital bone to form - lambdoid suture n lateral sides of skill merge with temporal bone to form - squamous suture

8 Suzanne D'Anna8 Parietal sagittal suture lambdoid suture

9 Suzanne D'Anna9 Temporal n paired n forms sides and base of skull n has pit or depression - mandibular or glenoid fossa (site of articulation with mandible) n sharp projections on underside - styloid process

10 Suzanne D'Anna10 Temporal (cont.) n rounded projection at back: - mastoid process n has canal on lateral sides - external auditory meatus n suture that connects occipital with parietal - lambdoid suture

11 Suzanne D'Anna11 Temporal (cont.) n zygomatic process projecting from inferior - articulates with temporal process of zygomatic bone n zygomatic process of temporal bone and temporal process of zygomatic bone make up zygomatic arch

12 Suzanne D'Anna12 Temporal glenoid fossa external auditory meatus mastoid process zygomatic process styloid process lamboid suture

13 Suzanne D'Anna13 Sphenoid n single bone n wedge or butterfly shaped n situated on cranial floor n central depression called sella turcica - surrounds pituitary gland n articulates with cranial bones

14 Suzanne D'Anna14 Sphenoid

15 Suzanne D'Anna15 Ethmoid n single n anterior part of cranial floor between orbits n anterior to sphenoid n posterior to nasal bones n primary supporting bone of nasal cavity

16 Suzanne D'Anna16 Ethmoid

17 Suzanne D'Anna17 Occipital n single n posterior and base of cranium (base and back) n has large opening called foramen magnun (through which spinal cord passes) n occipital protuberance is midway between top and foramen magnum n occipital condyles articulate with atlas

18 Suzanne D'Anna18 Occipital

19 Suzanne D'Anna19 Viscerocranium (facial bones) n nasal n vomer n inferior nasal conchae n lacrimal n maxilla n palatine n zygomatic n mandible

20 Suzanne D'Anna20 Nasal n paired oblong bones n side by side in midline n forms bridge of nose n major portion of the nose consists of cartilage

21 Suzanne D'Anna21 Vomer n single, triangular n in lower back of nasal cavity n forms portion of septum n partition of two nasal chambers

22 Suzanne D'Anna22 Inferior Nasal Conchae (KONG-ke) n paired thin, spongy n looks rolled or coiled n lateral wall of each nostril n function to increase interior surface area of the nose n also called turbinate bones

23 Suzanne D'Anna23 Lacrimal (lacrima = tear) n paired thin bones in anterior wall of orbit n inner angle of eye n directly behind frontal process of maxilla n lacrimal duct passes through n smallest of facial bones

24 Suzanne D'Anna24 lacrimal vomer nasal conchae

25 Suzanne D'Anna25 Maxillae n paired bones n join at midline to form upper jaw n articulates with all bones of face except mandible n form part of floor of orbits n form lateral walls and floor of nasal cavity n contain inferior orbital foramen n contain maxillary sinus which empty into nasal cavity

26 Suzanne D'Anna26 Maxillae (cont.) n forms most of hard palate n contains alveolar process - arch that contain alveoli (sockets) for maxillary (upper) teeth n contains palatine process - horizontal projection on maxilla anterior 3/4 of hard palate n maxillary bones unite before birth

27 Suzanne D'Anna27 Cleft Palate n failure of palatine processes to unite at about weeks of embryonic development n repair - between age one and age 2 Cleft Lip n split in the upper lip n repair - first year of life

28 Suzanne D'Anna28 Palatine Bones n paired n L-shaped n form posterior portion of hard palate n part of the floor and lateral wall of the nasal cavity n small portion of floors of the orbits

29 Suzanne D'Anna29 Palatine Bone

30 Suzanne D'Anna30 Zygomatic n paired n form prominences of the cheeks n part of lateral wall and floor of each orbit n also known as malars n temporal process of zygomatic bone projects posteriorly and articulates with zygomatic process of temporal bone - together form zygomatic arch

31 Suzanne D'Anna31 Mandible (mandere = to chew) n single bone, lower jaw n largest, strongest facial bone n only movable bone of skull (except ear ossicles) n contains alveolar process - arch that contain alveoli (sockets) for mandibular (lower) teeth

32 Suzanne D'Anna32 Mandible (cont.) n body; curved horizontal portion n two perpendicular portions: (rami) n condyloid process articulates with temporal bone n coronoid process attaches to temporalis muscle n mandibular angles n mental and mandibular foramen

33 Suzanne D'Anna33 zygomatic maxilla mandible

34 Suzanne D'Anna34 Hyoid Bone (hyoedes = U-shaped) n single bone n does not articulate with any other bone n suspended from styloid process by ligaments and tendons n located in neck between mandible and larynx n supports tongue; attachment for muscles of neck and pharynx n consists of body and projections n often fractured during strangulation


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