Bones of the Skull Suzanne DAnna 1 Sutures
Bones of the Skull Suzanne D'Anna 1
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 Suzanne D'Anna 2
Fontanels (little fountain) 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 n Suzanne D'Anna 3
Neurocranium (cranial bones) frontal n parietal n temporal n sphenoid n ethmoid n occipital n Suzanne D'Anna 4
Frontal 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 Suzanne D'Anna n 5
Frontal supraorbital foramen glabella Suzanne D'Anna 6
Parietal 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 n Suzanne D'Anna 7
Parietal sagittal suture lambdoid suture Suzanne D'Anna 8
Temporal 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 n Suzanne D'Anna 9
Temporal (cont. ) rounded projection at back: - mastoid process n has canal on lateral sides - external auditory meatus n suture that connects occipital with parietal - lambdoid suture n Suzanne D'Anna 10
Temporal (cont. ) 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 n Suzanne D'Anna 11
Temporal lamboid suture zygomatic process styloid process Suzanne D'Anna glenoid fossa external auditory meatus mastoid process 12
Sphenoid 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 n Suzanne D'Anna 13
Sphenoid Suzanne D'Anna 14
Ethmoid 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 n Suzanne D'Anna 15
Ethmoid Suzanne D'Anna 16
Occipital 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 n Suzanne D'Anna 17
Occipital Suzanne D'Anna 18
Viscerocranium (facial bones) nasal n vomer n inferior nasal conchae n lacrimal n maxilla n palatine n zygomatic n mandible n Suzanne D'Anna 19
Nasal paired oblong bones n side by side in midline n forms bridge of nose n major portion of the nose consists of cartilage n Suzanne D'Anna 20
Vomer single, triangular n in lower back of nasal cavity n forms portion of septum n partition of two nasal chambers n Suzanne D'Anna 21
Inferior Nasal Conchae (KONG-ke) 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 n Suzanne D'Anna 22
Lacrimal (lacrima = tear) 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 n Suzanne D'Anna 23
lacrimal conchae nasal vomer Suzanne D'Anna 24
Maxillae 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 n Suzanne D'Anna 25
Maxillae (cont. ) 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 n Suzanne D'Anna 26
Cleft Palate failure of palatine processes to unite at about 10 -12 weeks of embryonic development n repair - between age one and age 2 n Cleft Lip split in the upper lip n repair - first year of life n Suzanne D'Anna 27
Palatine Bones 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 n Suzanne D'Anna 28
Palatine Bone Suzanne D'Anna 29
Zygomatic 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 n Suzanne D'Anna 30
Mandible (mandere = to chew) 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 n Suzanne D'Anna 31
Mandible (cont. ) 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 n Suzanne D'Anna 32
zygomatic maxilla mandible Suzanne D'Anna 33
Hyoid Bone (hyoedes = U-shaped) 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 n Suzanne D'Anna 34
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