Sutures of the Skull Flashcards

Explore cranial sutures, their articulating bones, anatomical landmarks, fibrous structure, developmental changes, and clinical significance.

Card 1 of 30Question

What are cranial sutures?

Fibrous joints connecting adjacent bones of the skull.

In This Section

1. What are cranial sutures?

Fibrous joints connecting adjacent bones of the skull.

2. How are cranial sutures classified structurally?

As fibrous joints, specifically sutural joints.

3. What type of connective tissue occupies an unfused cranial suture?

Dense fibrous connective tissue continuous with the periosteum of adjacent bones.

4. What are the four major sutures of the cranial vault?

The coronal, sagittal, lambdoid, and squamous sutures.

5. Which bones are joined by the coronal suture?

The frontal bone and the two parietal bones.

6. Which bones are joined by the sagittal suture?

The right and left parietal bones.

7. Which bones are joined by the lambdoid suture?

The occipital bone and the two parietal bones.

8. Which bones are joined by the squamous suture?

The parietal bone and the squamous part of the temporal bone.

9. What is the metopic suture?

The median frontal suture between the two halves of the developing frontal bone.

10. What is a persistent metopic suture?

A frontal midline suture that remains visible after the usual period of childhood fusion.

11. Which suture connects the frontal and nasal bones?

The frontonasal suture.

12. Which suture connects the zygomatic and frontal bones?

The frontozygomatic suture.

13. Which suture connects the zygomatic bone to the maxilla?

The zygomaticomaxillary suture.

14. Which suture connects the two maxillae along the anterior hard palate?

The anterior portion of the median palatine suture.

15. Which suture joins the palatine processes of the maxillae to the horizontal plates of the palatine bones?

The transverse palatine suture.

16. What is the bregma?

The anatomical landmark at the intersection of the sagittal and coronal sutures.

17. What is the lambda?

The anatomical landmark at the intersection of the sagittal and lambdoid sutures.

18. What is the pterion?

The lateral cranial junction of the frontal, parietal, sphenoid, and temporal bones.

19. What is the asterion?

The junction of the parietal, occipital, and temporal bones.

20. What are fontanelles?

Membranous gaps between developing cranial bones where multiple sutures meet.

21. Which fontanelle corresponds to the bregma in the infant skull?

The anterior fontanelle.

22. Which fontanelle corresponds to the lambda in the infant skull?

The posterior fontanelle.

23. What is the developmental function of cranial sutures?

They permit expansion and remodeling of the skull as the brain grows.

24. How do sutures contribute to childbirth?

They allow temporary molding and overlap of cranial bones during passage through the birth canal.

25. What is synostosis of a cranial suture?

Bony fusion across a previously fibrous cranial joint.

26. What is craniosynostosis?

Premature fusion of one or more cranial sutures, potentially altering skull growth and shape.

27. Which skull deformity is commonly associated with premature sagittal suture fusion?

Scaphocephaly, characterized by a long, narrow skull.

28. What skull deformity can result from premature bilateral coronal suture fusion?

Brachycephaly, characterized by a shortened anteroposterior skull dimension.

29. Which characteristic skull shape results from premature metopic suture fusion?

Trigonocephaly, producing a triangular forehead.

30. What are Wormian bones?

Accessory ossicles that develop within cranial sutures, particularly the lambdoid suture.