KIN 324K LAB LECTURE 8 - Applied Human Anatomy Lab Lab...

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Applied Human Anatomy Lab Lab Lecture IX: Skull & Central Nervous System
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Lateral Ankle Ligaments Medial Ankle Ligaments
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Skull Skull has 22 bones Eight (8) cranial bones Fourteen (14) facial bones All joined at sutures Exception: hinge-like temporomandibular joint Calvaria : skull cap; frontal, parietal (2) and occipital bones
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Directions To Know Frontal : anterior Parietal : usually refers to the outer wall of a structure; think periphery Temporal : near temple, ear Occipital : posterior
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Cranial Bones Frontal bone : forehead, roofs of orbits (eye sockets), Supraorbital nerve & artery pass through supraorbital foramen Parietal bones (2) : lateral superior portion of cranium Has internal surfaces w/ depressions to accommodate blood vessels Temporal bones (2) : temples Squama temporalis “shaped like the scale of a fish” Zygomatic process : articulates with temporal process of zygomatic bone; two make up zygomatic arch Mastoid process : attachment for neck muscles Styloid process : attachment for tongue, neck muscles
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Squama temporalis
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Cranial Bones cntd. Occipital bone : posterior & prominent portion of base of cranium Foramen magnum : inferior hole; where medulla oblongotta, spinal portion of accessory nerve, Occipital condyles : either side of foramen magnum; articulate with depressions on 1 st cervical vertebrae External occipital protuberance : projection on posterior surface; can be felt above back of neck (bump)
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Cranial Bones cntd. Sphenoid bone : middle of base of skull Keystone of cranial floor (articulates w/ all cranial bones) Has greater & lesser wings; looks like butterfly Ethmoid bone : small rectangular spongy bone Anterior part of cranium floor between orbits
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Facial Bones Nasal bones (2) : small, oblong Meet in middle superior part of face Maxillae (2) : paired, form upper jaw Articulate w/ all bones of face except mandible Contains infraorbital foramen (infraorbital Zygomatic bones (2) : cheekbones Temporal process , along w/ zygomatic process of temporal bone, make up zygomatic arch
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Facial Bones cntd. Mandible : lower jaw bone Largest, strongest facial bone; only moveable skull bone Lacrimal bones (2) : smallest facial bones Palatine bones (2) : L-shaped Form posterior portion of hard palate, part of cranial floor, lateral walls of nasal cavities, & small portion of orbit floors
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Facial Bones cntd. Inferior nasal conchae (2) Allow for circulation & filtration of air before passage into lungs Vomer : triangular bone Forms inferior, posterior part of nasal septum Nasal septum : includes perpendicular plate of ethmoid, septal cartilage, & vomer
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Sutures Seam or stitch; immovable joint found between skull bones Coronal
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KIN 324K LAB LECTURE 8 - Applied Human Anatomy Lab Lab...

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