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Axial Skeleton Bones of the Skull
The Skull: Two Sets of BonesThe Cranium: Facial:
Cranium = 3 Sutures Three Sutures Coronal Sagittal Lamboidal
Cranium = 8 Bones Frontal = 1 Parietal = 2 Temporal = 2 Occipital = 1Sphenoid = 1 Ethmoid = 1
Frontal = #1(single)
Parietal = #2 (Pair)
Temporal = #4 (pair)
Bone Markings of the Temporal BoneExternal Acoustic Meatus Canal that leads to the eardrum
Bone Markings of the Temporal BoneStyloid Process Needle-like projection The site of muscle attachment for many neck muscles
Bone Markings of the Temporal BoneZygomatic Arch The bridge that joins with the cheek bone
Bone Markings of the Temporal BoneMastoid Process Rough projection posterior and inferior to the acoustic meatus Filled with air cavaties called mastoid sinuses Attachment site for neck muscles
Bone Markings of the Temporal BoneOpenings: Jugular Foramen Carotid Canal
Occipital = #3 (single)
Bone Markings of the Occipital BoneForamen Magnum Large opening that allows the spinal cord to connect with the brain
Bone Markings of the Occipital BoneOccipital Condyles Rest on the first vertebra of the spinal column
Sphenoid Butterfly shaped, spans the width of the skull
Markings of the SphenoidStella Turcica: “Turk’s Saddle” that holds the pituitary gland Foramen Ovale: Oval opening that allows Cranial Nerve V to pass to the chewing muscle
Features of the EthmoidCrista Galli: “Cock’s Comb” where the brain covering attaches Cribiform Plate: Nerves carrying olfactory receptors
Extensions of Ethmoid BoneSuperior and Middle Nasal Conchae Form lateral walls of the nasal cavity
Facial Bones Maxillae (2 Fused) Palatine (Paired) Zygomatic LacrimalNasal Vomer Inferior Nasal Conchae Mandible
Maxillae Upper Jaw All facial bones except the mandible join the maxillae Carry the upper teeth
Palatine Bones Paired bones form the posterior part of the hard palate
Zygomatic Bones The cheekbones Form the eye sockets
Lacrimal Bones Medial walls of the orbit (eye socket) with a groove for tears (lacrima = tear)
Nasal Bones = #4
Inferior Nasal Conchae
Hyoid Bone Not included with skull Closely related to the mandibleDoes not articulate (suspended) Base for tongue movement Attachment for neck muscles Not the Adam’s Apple, that is the thyroid cartilage surrounding the larynx
Bones of the Skull.
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