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The Skull Kyle Franklin Megan Gleason Emily Giannotti Pages 120-126 in Textbook.

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Presentation on theme: "The Skull Kyle Franklin Megan Gleason Emily Giannotti Pages 120-126 in Textbook."— Presentation transcript:

1 The Skull Kyle Franklin Megan Gleason Emily Giannotti Pages in Textbook

2 Cranial Sutures Sutures- lines at which 2 bones fuse together. These are the 4 on the cranium: – Coronal Suture- fuses parietal bones to frontal bone. – Lambdoidal Suture- fuses occipital bone to parietal bones (anteriorly). – Saggital Suture- fuses parietal bones in midline of skull. – Squamous Suture- fuses temporal bones to parietal bones.

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5 Cranial Bones The cranium consists of 8 bones (1 st 3 are largest): – Frontal (1)- forms forehead, projections under eyebrows, superior part of eye orbits. – Parietal (2)- form most of superior and lateral walls of cranium.

6 Cranial Bones -Temporal (2)- lie inferior to parietal bones. Contain 5 important markings: -External auditory meatus- canal that leads to eardrum and middle ear. -Styloid process- needlelike projection, inferior to external auditory meatus, provides for muscle attachment. -Zygomatic Arch- thin bridge of bone that joins anteriorly with cheekbone (zygomatic bone). -Mastoid Process- rough projection, full of air cavities (mastoid sinuses), provides for muscle attachment. -Jugular Foramen- medial to styloid process, allows passage of jugular vein, which drains brain.

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9 Cranial Bones – Occipital (1)- contains: Foramen Magnum- surrounds lower part of brain, allows spinal cord to connect to brain. Occipital Condyles- rest on the first vertebra of the spinal column. – Sphenoid (1)- most of this bone lies deep on the inferior aspect of the cranium. – Ethmoid (1)- irregular shape, anterior to sphenoid, forms rook of nasal cavity and part of medial walls of orbits. Christa Galli- projects from superior surface of ethmoid, outermost covering of brain attaches to it

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12 Facial Bones Maxillary- fuses to form upper jaw and all facial bones except mandible join it. Zygomatic- (cheekbones) makes up a good portion of lateral walls of orbits. Lacrimal- (fingernail-sized bones) forms part of medial walls of orbits and allows passageway for tears. Nasal- small rectangular bone forming the bridge of the nose. Mandible- (lower jaw) largest and strongest facial bone.

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14 Hyoid Bone Not technically part of the skull. Only bone in the body that does not articulate directly with any other bone. It is suspended in the mid-neck region. Function: moveable base for tongue and attachment point for the neck muscles that raise and lower the larynx when we swallow and speak.

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16 References Beresford, W. (n.d.). 206 Nervous System. Anatomy Department. Retrieved November 18, 2009, from wberesford.hsc.wvu.edu/206CNS.htm Ph.D., B. B. (2003, December 12). h&n lateral skull - temporal bone - squamous part. SUNY Upstate Medical University. Retrieved November 17, 2009, from Cummings, B. (n.d.). Use the following blank diagrams. Georgia Highlands College. Retrieved November 18, 2009, from 7_axial.htm Lecture 9: Axial Skeleton I. (n.d.). Computing Services for Faculty & Staff. Retrieved November 17, 2009, from APA formatting by BibMe.org


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