18 Questions
What serves as an attachment for muscles of mastication & facial expressions?
Maxilla
Which bone is the only movable bone of the skull?
Mandible
What bone has processes named zygomatic process, frontal process, and alveolar process?
Maxilla
Which structure is associated with the infraorbital canal?
Mandibular canal
Which part of the mandible has a symphysis menti?
Symphysis menti
Which bone has a sigmoid notch/mandibular notch in its ramus?
Mandible
Which bone forms the lower and back portion of the cranium?
Occipital bone
What is the function of lacrimal bones?
Antero-medial wall of orbital cavity
Which bone extends horizontally along the lateral wall of the nasal cavity?
Nasal bone
What is the function of zygomatic arch?
Prominence of cheek
Which bone forms the lower wall and part of the floor of the cranial cavity?
Temporal bone
What is pierced by the foramen magnum?
Occipital bone
Which part of the skull houses the human brain?
Occipital bone
Which bone forms the sides and roof of the cranium?
Parietal bone
Which part of the skull can be seen in the lateral view?
Temporal bone
Which part of the skull can be found at the junction between the two parietal bones and the occipital bone?
Parietal foramen
Which part of the skull protects delicate sense organs such as eyes and ears?
Temporal bone
Which part of the skull is fibrous joint synarthrosis and includes sutures?
Occipital bone
Study Notes
Skull Structure
- The skull is divided into two parts: Neurocranium (calvaria/skull cap) and Viscerocranium (facial skeleton)
- The skull is considered a fibrous joint (synarthrosis) and is composed of sutures
Bone Views
- Anterior view: Norma frontalis (front)
- Lateral view: Norma lateralis (side)
- Posterior view: Norma occipitalis (back)
- Inferior view: Norma basalis (base)
- Superior view: Norma verticalis (top)
Fontanelles
- Fontanelles are the spaces between the bones of an infant's skull where the sutures intersect
- Function: protect the brain, support delicate sense organs
- There are two fontanelles:
- Anterior fontanelle (soft spot): junction of the two frontal and two parietal bones
- Posterior fontanelle: junction of the two parietal bones and the occipital bone
Cavity Structure
- Cranial cavity
- Oral cavity
- Nasal cavity
- Buccal cavity
- Middle and inner ear cavities
- Paranasal sinuses
Bone Structure
- Parietal bone: forms the roof and sides of the cranium, can be seen in the lateral view
- Frontal bone: forms the anterior wall and 1/3 of the roof of the cranial cavity, floor of the anterior or cranial fossa, and roof of the orbit
- Occipital bone: forms the lower and back portion of the cranium, pierced by the foramen magnum
- Mandible: largest and strongest bone, serves as attachment for muscles of mastication and facial expressions, has a body and a ramus
- Zygomatic bone: forms the floor of the orbit, walls of the nasal cavity, roof of the oral cavity, and maxillary sinus
- Lacrimal bone: smallest and most fragile bone, forms the antero-medial wall of the orbital cavity
- Nasal bone: extends horizontally along the lateral wall of the nasal cavity
- Palatine bone: part of the hard palate, wall of the nasal cavity, and floor of the orbit
- Vomer: thin bone, forms the inferior half of the nasal septum
Sutures
- Allow the bones to move during the birth process
- Designed to enlarge or adjust depending on the birth canal portion
- Examples:
- Sagittal suture: between the parietal bones
- Coronal suture: between the frontal and parietal bones
- Lambdoid suture: between the occipital bone and parietal bones
- Squamous suture: between the parietal and squamous temporal bones
Test your knowledge on the different sutures of the skull such as sagittal, coronal, lambdoid, and squamous sutures. Understand the specific bones like the frontal bone and their roles in the cranial cavity and orbit.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
