1. What type of bone is the frontal bone?
An unpaired cranial bone that forms the forehead, anterior cranial vault, and part of the orbital roofs.
2. What are the three major anatomical parts of the frontal bone?
The squamous part, orbital part, and nasal part.
3. Which part of the frontal bone forms the forehead?
The squamous part, also called the frontal squama.
4. What is the glabella?
A smooth midline prominence of the frontal bone between the superciliary arches.
5. What are the superciliary arches?
Paired bony elevations above the medial portions of the orbits that underlie the eyebrows.
6. What is the frontal eminence?
A rounded prominence on each side of the frontal squama, marking a primary center of ossification.
7. What forms the superior bony margin of each orbit?
The supraorbital margin of the frontal bone.
8. Which structures pass through the supraorbital notch or foramen?
The supraorbital nerve, artery, and vein.
9. Which nerve emerges near the medial end of the supraorbital margin through the frontal notch?
The supratrochlear nerve, a branch of the frontal nerve.
10. Which projections of the frontal bone articulate with the zygomatic bones?
The paired zygomatic processes of the frontal bone.
11. What is the temporal line of the frontal bone?
A curved ridge extending upward and backward from the zygomatic process, contributing to the boundary of the temporal fossa.
12. Which parts of the frontal bone form most of the roofs of the orbits?
The paired orbital plates of the orbital part.
13. What is the lacrimal fossa of the frontal bone?
A depression in the anterolateral orbital roof that accommodates the lacrimal gland.
14. What is the trochlear fovea?
A small depression in the anteromedial orbital roof associated with the pulley of the superior oblique muscle.
15. What is the ethmoidal notch of the frontal bone?
A midline gap between the orbital plates that accommodates the cribriform plate and ethmoidal labyrinths.
16. What is the fovea ethmoidalis?
The portion of the frontal bone forming the roof of the ethmoidal air cells.
17. Which cranial fossa is partly formed by the internal surface of the frontal bone?
The anterior cranial fossa, which supports the frontal lobes of the brain.
18. What is the frontal crest?
A midline ridge on the internal surface of the frontal bone that provides attachment for the falx cerebri.
19. Which venous sinus is associated with the sagittal sulcus on the internal surface of the frontal bone?
The superior sagittal sinus.
20. Where are the frontal sinuses located?
Within the frontal bone, usually deep to the superciliary arches and superior to the nasal root.
21. Where does mucus from the frontal sinus normally drain?
Into the middle nasal meatus through the frontal recess.
22. Which nerves provide sensory innervation to the frontal sinus mucosa?
Branches of the supraorbital nerve, arising from the ophthalmic division of the trigeminal nerve (V1).
23. Which arteries supply the frontal sinus?
Branches of the supraorbital and anterior ethmoidal arteries, arising from the ophthalmic artery.
24. Which suture connects the frontal bone to the parietal bones?
The coronal suture.
25. What is the metopic suture?
The median frontal suture between the two frontal bone halves in early life, which may persist into adulthood.
26. Which bones articulate with the frontal bone?
The parietal, sphenoid, ethmoid, nasal, maxillary, lacrimal, and zygomatic bones.
27. What is the bregma?
The junction of the coronal and sagittal sutures, corresponding to the anterior fontanelle in infants.
28. How does the frontal bone develop embryologically?
Primarily through intramembranous ossification from paired ossification centers.
29. What skull deformity is associated with premature fusion of the metopic suture?
Trigonocephaly, characterized by a triangular forehead.
30. Why can a fracture of the posterior wall of the frontal sinus cause cerebrospinal fluid rhinorrhea?
It can create a defect between the anterior cranial fossa and frontal sinus, allowing cerebrospinal fluid to enter the nasal cavity.
