LRA 225 TEST PAPER FULL SOLUTION
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● List the 4 cranial bones that form the calvaria (skull cap)
Answer: A. Frontal
B. Right parietal
C. Left parietal
D. Occipital
●● List the 4 cranial bones that form the floor of the cranium
Answer: A. Right temporal
B. Left temporal
C. Sphenoid
D. Ethmoid
●● The small horizontal plate of the ethmoid is called the
Answer: Cribriform plate
●● The vertical plate of the ethmoid bone forming the upper portion of
the bony nasal septum is the
Answer: Perpendicular plate
,●● A structure found in the middle of the sphenoid bone that surrounds
the pituitary gland is the
Answer: Sella turcica
●● The posterior aspect of the sella turcica is called the
Answer: Dorsum sellae
●● Which structure of the sphenoid bone allows for the passage of the
optic nerve & is the actual opening into the orbit?
Answer: Optic foramen
●● Which structures of the sphenoid bone help to form part of the lateral
walls of the nasal cavities?
Answer: Medial & lateral pterygoid processes
●● Which radiographic projection best demonstrates the sella turcica &
dorsum sellae?
Answer: Lateral projection
●● Which aspect of the frontal bone forms the superior aspect of the
orbit?
Answer: Orbital or horizontal portion
,●● Cranial sutures are classified as being _____ joints
Answer: Fibrous or synarthrodial
●● Small, irregular bones that sometimes develop in adult skull sutures
are called __________ or __________ bones & are most frequently
found in the __________ suture
Answer: Sutural or wormian; lambdoidal
●● Which term describes the superior rim of the orbit? (Include the
abbreviation)
Answer: Supraorbital margin (SOM)
●● What is the name of the notch that separates the orbital plates from
each other?
Answer: Ethmoidal notch
●● Which cranial bones form the upper lateral walls of the calvarium?
Answer: Right & left parietals
●● What cranial bone contains the foramen magnum?
Answer: Occipital
, ●● A small prominence located on the squamous portion of the occipital
bone is called the
Answer: External occipital protuberance, or inion
●● What is the name of the oval processes found on the occipital bone
that helps form the atlanto-occipital joint?
Answer: Occipital condyles, or lateral condylar portions
●● List the 3 aspects of the temporal bones
Answer: A. Squamous
B. Mastoid
C. Petrous
●● True/False: The mastoid portion of the temporal bone is the densest
of the 3 aspects of the temporal bone
Answer: False (petrous portion)
●● Which external landmark corresponds with the level of the petrous
ridge?
Answer: Top of the ear attachment (TEA)
●● Which opening in the temporal bone serves as a passageway for
nerves of hearing & equilibrium?
QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● List the 4 cranial bones that form the calvaria (skull cap)
Answer: A. Frontal
B. Right parietal
C. Left parietal
D. Occipital
●● List the 4 cranial bones that form the floor of the cranium
Answer: A. Right temporal
B. Left temporal
C. Sphenoid
D. Ethmoid
●● The small horizontal plate of the ethmoid is called the
Answer: Cribriform plate
●● The vertical plate of the ethmoid bone forming the upper portion of
the bony nasal septum is the
Answer: Perpendicular plate
,●● A structure found in the middle of the sphenoid bone that surrounds
the pituitary gland is the
Answer: Sella turcica
●● The posterior aspect of the sella turcica is called the
Answer: Dorsum sellae
●● Which structure of the sphenoid bone allows for the passage of the
optic nerve & is the actual opening into the orbit?
Answer: Optic foramen
●● Which structures of the sphenoid bone help to form part of the lateral
walls of the nasal cavities?
Answer: Medial & lateral pterygoid processes
●● Which radiographic projection best demonstrates the sella turcica &
dorsum sellae?
Answer: Lateral projection
●● Which aspect of the frontal bone forms the superior aspect of the
orbit?
Answer: Orbital or horizontal portion
,●● Cranial sutures are classified as being _____ joints
Answer: Fibrous or synarthrodial
●● Small, irregular bones that sometimes develop in adult skull sutures
are called __________ or __________ bones & are most frequently
found in the __________ suture
Answer: Sutural or wormian; lambdoidal
●● Which term describes the superior rim of the orbit? (Include the
abbreviation)
Answer: Supraorbital margin (SOM)
●● What is the name of the notch that separates the orbital plates from
each other?
Answer: Ethmoidal notch
●● Which cranial bones form the upper lateral walls of the calvarium?
Answer: Right & left parietals
●● What cranial bone contains the foramen magnum?
Answer: Occipital
, ●● A small prominence located on the squamous portion of the occipital
bone is called the
Answer: External occipital protuberance, or inion
●● What is the name of the oval processes found on the occipital bone
that helps form the atlanto-occipital joint?
Answer: Occipital condyles, or lateral condylar portions
●● List the 3 aspects of the temporal bones
Answer: A. Squamous
B. Mastoid
C. Petrous
●● True/False: The mastoid portion of the temporal bone is the densest
of the 3 aspects of the temporal bone
Answer: False (petrous portion)
●● Which external landmark corresponds with the level of the petrous
ridge?
Answer: Top of the ear attachment (TEA)
●● Which opening in the temporal bone serves as a passageway for
nerves of hearing & equilibrium?
