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Skull Anatomy L2
Skull Anatomy Lecture 2
| Question | Answer |
|---|---|
| Sphenoid consists of | Body, 2 wings, 2 inferior processes |
| The body of Spenoid is located | in the center of the bone lying in the midline of the floor of the cranium |
| The sphenoid Sinus is located in the____of spehnoid | Body |
| The _____wall of the body forms the _____wall of the ____cavity | anterior wall of the body,the posterior wall of the nasal cavity |
| Ath the inferior surface of the body are two large holes called______which are formed from___&___.This is an opening for | Carotid Sulci,spenoid and temporal bone, carotid arteries |
| Small slit off the carotid sulcus is | Foramen Lacerum |
| The four Foramen of Sphenoid are | Lacerum, ROS which is rotundum, ovale and spinosum |
| The anterior wall of the body of sphenoid articulates with | the perpendicular plate of Ethmoid at its posterior surface at a pointed process call Rostrum |
| The_____is a groove on top of the body of sphenoid and accomodates the crossing of the ___nerve to the ______ | Chiasmatic Groove, optic nerve, optic foramen |
| The optic foramen lies at an angle of___degrees to the ___ | 40 degrees to the Midsag plane |
| The Sella Turcia is located on the____aspect of the body. It is a deep depression that houses____Also known as___&____ | superior, the pituitary Gland,(Hypophysis)& Master Gland |
| The Sella Turcia resembles a 4poster bed and the 4 structures that make it up are | Tuberculum Sella(ant wall), Anterior Clinoid Processes(knob of lesser wing of spenoid), Dorsum Sellae(post wall),Posterior Clinoid(knob on dorsum sella) |
| The posterior wall of Sella Turcica(Dorsum Sellae) articulates w/ the_____portion of the Occipital bone at a slope called_____ | Basilar portion, Clivus |
| Two pairs of wings of spenoid | grater and lesser wings |
| Greater Wing Foramen | ROS |
| Deep concave structures, form a portion of the floor and sides of cranium, and make up the posterior portion of the orbits | greater wing of spenoid |
| Round foramen adjeacent to lateral wall of body of sphenoid houseing the maxillary nerve | Foramen Rotundum |
| Oval-shaped largest foramen, opening to mandibular nerve | Foraman Ovale |
| smallest foramen and most laterally located opening for mid-meningeal artery | Foramen spinosum |
| Triangular in shape and arise from the anterolateral portion of the body of spenoid | lesser wing |
| small column of bone off the lesser wing which encloses the optic foramen | sphenoid strut |
| Passageway for cranial nerves, opening between greater and lesser wings of sphenoid | Supraorbital fissure |
| Two processes which arise from the lateroinferior portion of the body of spenoid | pterygoid process. each has a lat. and med. plate |
| Large groove between the medial and lateral plates of the pterygoid process | Pterygoid Fossa |
| Hook like process off the medial plate pterygoid process | Hamular process |
| The_______of sphenoid bones articulates with the palatine bones and_____to form the poserior lateral walls of nasal cavity | Pterygoid Process and Vomer |
| _____is a slit off ________, the opening for transmission if the internal carotid arteries | foramen lacerum, carotid sulcus |
| The Pterygoid process of spheniod articulates w/ bones______&_______ in the _____aspect of the nasal cavity | palatine and vomer, posterior aspect of the Nasal Cavity |
| The occipital bone is located in the_______potion of the cranium | posteroinferior portion |
| A majority of the Posterior cranial Fossa is formed by______ | Occipital |
| The_____foramen is the larget in the skull. It is located between____&_____ | Foramen Magnum, located between two portions of the occipital bone and squamos |
| The occipital bone consists of___&___ | squamous portion(int and ext) and basilar(base) portion |
| The occipital condyle are located on the ____portion of squamous and articulate w/__ to form the_____ | external portion of squamous, C1, occipitalatlantal joint(condyloid, nodding and side bending) |
| The____(also called_____or____) is a prominent elevation on external squamous portion | External Occipital Protuberance, Inion, Bump of Knowledge |
| Cross like structure on internal portion of squamous is called______. It divides int occip. squam. into ___fossa to accomodate the lobes of___&____ | cruciate eminence, 4 fossa, to accomidate cerebrum and cerebellum lobes |
| Two deep depressions on either side of foramen magnum | jugular notch |
| The jugular foramen is formed by____of the ____bone, and ____of the ____bone | jugular notch of occipital and jugular fossa of temporal bone |
| Basilar Portion of Occipital articulates w/ | shenoid |
| Basilar portion of Occipital is there for the support of the | pons and medulla oblongata through foramen magnum |
| Slope of bone on basilar portion if occipital is called____It articulates w/ ______of the spehnoid bone | Clivas, articulates w/ Dorsum Sellae of Sphenoid |
| The four portions of the Temporal Bone | Squamous(ext), Mastoid(ext), Tympanic, Petrous |
| flattened fan like portion of temporal bone is called______ it articulates w/ the_____wing of sphenoid | squamous, greater wing |
| The Zygomatic arch is formed by____&____ | zygomatic process of temporal and temporal process of zygomatic |
| The zygomatic process is part of what facial feature | cheek bones |
| The zygomatic arch corresponds to what line | infraorbitomeatal or reids baseline |
| What are the fossas of squamous of temporal | temporal fossa and mandibular fossa |
| What forms the TMJ | The mandibular fossa of squamous and the condyle of the mandible |
| The first air cells develop in the____portion of the ______bone. and are called________ | mastiod portion of temporal bone and are called Mastoid Antrum |
| The structures that form the middle ear are___,___&_____ | Tympanic membrane, Tympanic Cavity, and auditory Ossicles |
| In the Tympanic/middle ear the auditory Ossicles have three small bones called__,___&__which do what | malleus, incus and stapes, convey sound waves from external to inner ear |
| The____portion of Temporal are the thickest, densest structures of the skull. it is also called___or____or____ | petrous portion, petrous ridges, pars petrosa, petrous pyramids |
| The degree of angulation of petrous ridges | 45-47 meso, 54 brady, 40 dolicho |
| The upper ridge of the petrous pyramid is called, this corrisponds to the landmark___on the external skull | The Arcuate Eminence, TEA and the infraorbital line |
| Directly beneath the Arcuate Eminence is the____ | Internal Auditory Canal |
| Internally the cranium is divided into three regions called | Anterior, middle and posterior Cranial Fossa |
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