Bones and Markings of the Cranium
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Frontal Bone | Forms the ant. cranium, articulates post. w/ parietal bones via coronal suture.
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Coronal Suture | Suture formed by the articulation of the parietal and frontal bones.
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Frontal Squama | Commonly known as the forehead, the most ant. part of the frontal bone. Ends at the supraorbital margins
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Supraorbital Margins | The thickened superior margins of the orbits that lie under the eyebrows.
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Anterior Cranial Fossa | Formed chiefly by the frontal and sphenoid bones, supports the frontal lobes of the brain.
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Supraorbital Foramen (Notch) | Pierces the supraorbital margin superior to each orbit, allows passage of the supraorbital artery and nerve to the forehead.
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Glabella | Smooth portion of the frontal bone between the two orbits.
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Frontal Sinuses | Located within the frontal bone and located laterally to the glabella.
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Parietal Bones | Paired bones that form most of the superior and lateral aspects of the skull, aticulates w/ the frontal (ant.) and occipital (post.)and temporal (laterally).
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Sagittal Suture | Where the parietal bones meet superiorly at the cranial midline.
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Lambdoid Suture | Where the parietal bones meet the occipital bone posteriorly.
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Squamous Suture | Where the parietal and temporal bones meet on the lateral aspect of the skull.
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Occipital Bone | Forms most of the post. skull wall and base, articulates w/ the parietal and temporal (ant.), and the sphenoid via the cranial floor.
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Occipitomastoid Suture | Where the occipital bone meets the temporal bone.
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Posterior Cranial Fossa | Formed by the occipital bone, supports the cerebellum of the brain.
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Foramen Magnum | Large foramen located in the base of the occipital bone, allows connection of the inferior brain w/ the spinal cord.
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Occipital Condyles | Flank the foramen magnum laterally, rockerlike in shape, articulate with the C1 to allow nodding of the head.
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Hypoglossal Canal | Hidden medially and superiorly to the occipital condyles, allow passage of the hypoglossal nerve.
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Exterior Occipital Protuberance | Just superior to the foramen magnum, felt as a knoblike projection below the most bulging part of the post. skull
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External Occipital Crest | Marks the occipital near the foramen magnum, secures the ligamentum nuchae.
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Ligamentum Nuchae | Elastic ligament that connects the vertebrae of the neck to the skull via the external occipital crest.
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Superior and Inferior Nuchal Lines | Mark the occipital bone near the foramen magnum, provide anchor sites for many neck and back muscles.
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Temporal Bones | Lie inferor to parietal, form the inferolateral aspects of the skull and parts of the cranial floor.
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Four Regions of the Temporal Bone | Squamous, tympanic, mastoid, petrous
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Squamous Region (Temporal Bone) | Abuts the squamous suture, contains the zygomatic process.
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Zygomatic Process | Barlike bony process, extends from the sqamous region of temporal to meet the zygomatic bone.
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Zygomatic Arch | Formed by the zygomatic process and the zygomatic bone, felt as the projection of the cheek.
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Mandibular Fossa | Located on the inferior surface of the zygomatic process, receives the condyle of the mandible to form the temporomanidibular joint.
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Tympanic Region (Temporal Bone) | Surrounds the external acoustic meatus
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External Acoustic Meatus | Commonly known as the external ear canal, opening through which sound enters.
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Styloid Process | Needlelike process located below the external acoustic meatus, provides attachment point for tongue and neck muscles.
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Mastoid Region (Temporal Bone) | Located post. to the tympanic region, contains the mastoid process
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Mastoid Process | Anchoring site for some neck muscles, can be felt as a lump just post. to ear
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Stylomastoid Foramen | Located between the styloid and mastoid processes, allows passage of the facial nerve (cranial VII).
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Petrous Region (Temporal Bone) | Deep part of the bone, contributes to the cranial base, looks like a mountain range between the occipital post. and the sphenoid ant.
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Middle Cranial Fossa | Formed by the petrous temporal bone and the sphenoid bone, supports the temporal lobes of the brain.
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Jugular Forament | Located at the junction of the occipital and petrous temporal bone, allows passage of internal jugular vein and 3 cranial nerves.
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Carotid Canal | Located just ant. to the jugular foramen, allows passage of the internal carotid arteries into the cranial cavity.
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Sphenoid Bone | Butterfly shaped, spans the width of the middle cranial fossa, "keystone" of the cranium that forms a central wedge that articulates w/ all other cranial bones.
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Division of Sphenoid Bone | Divided into a central body and 3 pairs of processes, greater wings, lesser wings and pterygoid process.
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Sella Turcica | "Turk's Saddle", saddle shaped prominence located on the superior surface of the sphenoid body.
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Hypophyseal Process | Seat of the sella turcica saddle, forms a snug enclosure for the pituitary gland (hypophysis).
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Tuberculum Sellae | Abuts the hypophyseal fossa anteriorly.
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Dorsum Sellae | Abuts the hypophyseal fossa posteriorly.
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Greater Wings of the Sphenoid | Project laterally, form parts of the middle cranial fossa, dorsal walls of the orbits, and external wall of the skull.
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Lesser Wings of the Sphenoid | Hornlike, form part of the floor of the anterior cranial fossa and medial walls of the orbits.
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Anterior Clinoid Processes | Termination of the lesser wings of the sphenoid bone, provide anchoring site for securing the brain within the skull.
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Pterygoid Process | Trough-shaped, project inferiorly from the junction of the sphenoid body and greater wings, anchors pterygoid muscles important in chewing.
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Optic Canal | Connected by the chiasmatic groove, lie ant. to the sella turcica, allow passage of the optic nerve.
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Superior Orbital Fissure | Long slit between the greater and lesser wings of the sphenoid, allows passage of cranial nerves III, IV, VI that control eye movement.
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Foramen Rotundum | Located in the medial part of the sphenoid greater wing, provides passage of the maxillary branch of cranial nerve V.
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Foramen Ovale | Located post. to the foramen rotundum on the sphenoid greater wing, allows passage of the mandibular branch of cranial nerve V.
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Foramen Spinosum | Located post. and laterally to the foramen ovale on the sphenoid greater wing, provides passage of the middle meningeal artery.
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Ethmoid Bone | Located between the sphenoid and nasal bones, most deeply situated bone of the skull, forms most of the bony area between nasal cavity and orbits.
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Cribriform Plates | Forms the superior surface of the ethmoid bone, help form roof of nasal cavity, punctured by olfactory foramina that allow passage of olfactory nerves.
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Crista Galli | "Rooster's comb" projects superiorly between cribiform plates of the ethmoid, dura mater attaches and helps secure the brain to the cranial cavity.
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Perpendicular Plate | Inferior projection of the ethmoid bone, forms superior part of the nasal septum.
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