Unit 2- Skull Flashcards
What does neurocranium refer to?
cranial vault
What is the purpose of the Neurocranium?
-protects brain
-houses the organs of hearing and balance
-site of attachment for head and neck muscles
What makes up the Neurocranium?
4 singular bones (Frontal, Ethmoid, Sphenoid, & Occipital)
2 sets of paired bones (Temporal & Parietal)
What is the Calvarium?
domelike roof of neurocranium
What makes up the Calvarium?
What is a fontanelle?
membranous interval at the margins of cranial bones in fetal skull
What type of person has a fontanelle?
fetus/ infant
What makes it a supraorbital notch vs supraorbital foramen?
A notch is not closed
A foramen is a closed circle
What is described as a boomerang?
Inferior orbital fissure and Superior orbital fissure
What is the feature of a supraorbital notch/ foramen?
passage for Branch of Cranial Nerve V1 (Supraorbital Nerve)
What is the feature of a infraorbital notch/ foramen?
passage for Branch of Cranial Nerve V2 (Infraorbital Nerve)
What is the feature of Superior orbital fissure?
passage for Cranial Nerves III, IV, V1, and VI
What is the feature of Inferior orbital fissure?
passage for Branch of Cranial Nerve V2 (Infraorbital Nerve)
What is the feature of Nasolacrimal Canal?
passage for Nasolacrimal duct
What combined makes the zygomatic arch?
Zygomatic process (of temporal bone) + Temporal process (of zygomatic bone)
Why is the Carotid Canal important?
Passage for Internal Carotid artery
Why is the Stylomastoid Foramen important?
Passage for Cranial nerve VII (Facial Nerve)
Why is the Occipital Condyle important?
Articulates with first cervical vertebrae (atlas)
Why is the Mastoid Process important?
Attachment of SCM
Why is the Mandibular Fossa important?
Articulates with the mandible (through the condylar process)
Why is the Cribriform Plate important?
passage for CN I (Olfactory Nerves)
Why is the Optic Canal important?
passage for CN II (Optic Nerve)
Why is the Superior Orbital Fissure important?
passage for Cranial Nerves III, IV, V1, and VI
Why is the Foramen Rotundum important?
passage for CN V2 (Maxillary Branch of Trigeminal N.)
Why is the Foramen Ovale important?
passage for CN V3 (Mandibular Branch of Trigeminal N.)
Why is the Foramen Spinosum important?
passage for Middle Meningeal Vessels
Why is the Foramen Lacerum important?
NOT ACTUALLY IMPORTANT, IT’S JUST THERE
passage for NOT a true opening - filled with cartilage when alive
Why is the Internal Acoustic Meatus important?
passage for CN VIII (Vestibulocochlear)
Why is the Jugular Foramen important?
passage for Internal Jugular V., Cranial Nerves IX, X & XI
Why is the Hypoglossal Canal important?
passage for CN XII (Hypoglossal N.)
Why is the Foramen Magnum important?
passage for Vertebral Arteries, Spinal Cord, CN XI (Accessory N.)
Why is the Crista Galli important?
Attachment site for Falx Cerebri
Why is the Sella Turcica important?
Houses Pituitary Gland
Why is the Petrous Portion (of Temporal Bone) important?
Protects structures of inner ear
What two things make up a nasal septum?
perpendicular plate + vomer bone
Why is the Condylar Process important?
Articulates with mandibular fossa
Why is the Mental Foramen important?
Passage for mental nerve and vessels
Why is the mandibular foramen important?
Passage for inferior alveolar nerve
(where you are injected with anesthetic during dental procedures)
