Bones of the Human Skull

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Questions and Answers

What is one of the primary functions of the human skull?

  • To aid in hormone production
  • To store fat for energy
  • To produce blood cells
  • To support structures of the head and brain (correct)

Which type of ossification is primarily responsible for the formation of most skull bones?

  • Intramembranous ossification (correct)
  • Endochondral ossification
  • Cartilaginous ossification
  • Intramembranous and endochondral ossification equally

Which of the following structures does NOT pass through a foramen in the skull?

  • Muscles
  • Nerves
  • Ligaments (correct)
  • Blood vessels

What is a distinguishing feature of the neurocranium compared to the viscerocranium?

<p>It encases the brain (A)</p> Signup and view all the answers

What are fontanelles in relation to the human skull?

<p>Fibrous membranes between the skull bones of infants (B)</p> Signup and view all the answers

Which fontanelle is the largest and typically closes around age 2?

<p>Anterior Fontanelle (A)</p> Signup and view all the answers

What anatomical structure closes around 2 months of age?

<p>Posterior Fontanelle (B)</p> Signup and view all the answers

Which suture is found between the frontal and parietal bones?

<p>Coronal Suture (A)</p> Signup and view all the answers

At what age does the frontal (metopic) suture typically close?

<p>By 8 years of age (B)</p> Signup and view all the answers

Where does the pterion occur?

<p>Where the greater wing of sphenoid, frontal, parietal, and squamous part of temporal bone meet (A)</p> Signup and view all the answers

Which of the following bones is primarily formed through intramembranous ossification?

<p>Maxilla (C)</p> Signup and view all the answers

What is the primary function of cranial nerves?

<p>To emerge from the cranial cavity via foramina or fissures (D)</p> Signup and view all the answers

Which of the following represents a fibrous joint of cranial bones?

<p>Coronal suture (C)</p> Signup and view all the answers

Which of the following bones is considered unpaired in the skull?

<p>Mandible (B)</p> Signup and view all the answers

What structure is formed by the greater wing of the sphenoid bone?

<p>Middle cranial fossa (B)</p> Signup and view all the answers

Which bone houses the pituitary gland within the skull?

<p>Sphenoid (B)</p> Signup and view all the answers

What is the primary function of the occipital condyles?

<p>Articulate with the vertebrae (C)</p> Signup and view all the answers

Which of the following statements is true regarding the bones of the calvaria?

<p>They contain diploë, a layer of cancellous bone. (A)</p> Signup and view all the answers

Which paired bone forms part of the zygomatic arch?

<p>Temporal (C)</p> Signup and view all the answers

What separates the internal and external tables of compact bone in the calvaria?

<p>Diploë (D)</p> Signup and view all the answers

Which of the following bones does NOT contribute to the anterior cranial fossa?

<p>Temporal (C)</p> Signup and view all the answers

Which structure is part of the ethmoid bone?

<p>Crista galli (C)</p> Signup and view all the answers

What feature distinguishes the foramen magnum?

<p>It serves as the opening for the spinal cord. (B)</p> Signup and view all the answers

What is the process called by which flat bones of the skull are formed from mesenchyme?

<p>Intramembranous ossification (C)</p> Signup and view all the answers

Which part of the skull functions primarily as a bony case for the brain?

<p>Neurocranium (D)</p> Signup and view all the answers

Which of the following bones is NOT part of the viscerocranium?

<p>Occipital (C)</p> Signup and view all the answers

Which ossification process is responsible for forming the cartilaginous parts of the neurocranium?

<p>Endochondral ossification (B)</p> Signup and view all the answers

Which bone is classified as both a part of the neurocranium and the viscerocranium?

<p>Ethmoid (B)</p> Signup and view all the answers

What type of ossification is primarily involved in the formation of the maxilla?

<p>Intramembranous ossification (D)</p> Signup and view all the answers

The base of the skull primarily undergoes which type of ossification?

<p>Endochondral ossification (A)</p> Signup and view all the answers

Which cranial bone is characterized as unpaired?

<p>Frontal (B)</p> Signup and view all the answers

Which of the following structures is primarily supported by the viscerocranium?

<p>Facial structures (B)</p> Signup and view all the answers

Where does the ossification of ear ossicles occur?

<p>Endochondral ossification (D)</p> Signup and view all the answers

Flashcards

Bones of the skull

The human skull consists of both unpaired and paired bones that provide structure and shape.

Calvaria

The upper dome-like part of the skull that encases the brain, also known as the skullcap.

Intramembranous ossification

A process where bone develops directly from connective tissue membranes, forming important skull bones.

Fontanelles

Soft spots on an infant's skull that allow for growth and passage through the birth canal.

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Foramina

Small openings in the skull that allow nerves and blood vessels to pass through.

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Axial Skeleton

The part of the skeleton that includes the skull, hyoid, ribs, sternum, vertebrae, and sacrum.

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Appendicular Skeleton

The part of the skeleton that includes bones of the upper and lower limbs.

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Unpaired Bones of the Skull

Bones in the skull that are singular, including frontal, occipital, sphenoid, vomer, and ethmoid bones.

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Paired Bones of the Skull

Bones in the skull that come in pairs, including parietal, temporal, zygomatic, maxilla, nasal, lacrimal, inferior conchae, and palatine bones.

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Frontal Bone

Unpaired bone forming the forehead, including the supraorbital margin and glabella.

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Occipital Bone

Unpaired bone forming the back of the skull, housing the foramen magnum.

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Sella Turcica

A saddle-shaped depression in the sphenoid bone that houses the pituitary gland.

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Cranial Fossae

The depressions in the cranial base that accommodate the brain regions: anterior, middle, and posterior.

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Diploë

Cancellous bone found between the layers of the compact bone in the skull, containing red bone marrow.

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Mandible

The unpaired bone making up the lower jaw, containing processes for muscle attachment and alveolar processes.

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Neurocranium

The portion of the skull that encloses the brain, including bones like the frontal, parietal, occipital, and temporal.

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Viscerocranium

The facial skeleton portion of the skull; includes bones like the maxilla, zygomatic, and mandible.

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Fontanelles closure timing

Specific points on an infant's skull where soft spots close; anterior by age 2, posterior by 2 months.

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Coronal suture

The fibrous joint connecting the frontal and parietal bones of the skull.

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Sagittal suture

The fibrous joint between the two parietal bones that runs front to back.

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Bregma

The junction point where the sagittal suture meets the coronal suture.

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Temporal bone parts

Includes petrous, mastoid, and squamous parts, crucial for hearing and balance.

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Cranial nerves

Nerves that emerge from the brain through openings in the skull, innervating head and neck regions.

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Endochondral ossification

Process where mesenchyme first forms a cartilage model, which is then converted into bone.

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Flat bones of the skull

Bones that undergo intramembranous ossification, forming the cranial vault.

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Mesenchyme

Embryonic connective tissue from which bones and other structures develop.

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Chondrocranium

The cartilaginous part of the neurocranium forming the base of the skull.

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Cranial meninges

Membranous coverings surrounding the brain, protected by the neurocranium.

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Ethmoid bone

Bone that is part of both the neurocranium and viscerocranium, located between eyes.

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Study Notes

The Human Skull

  • The human skull has 28 bones
  • Some bones are paired, some are unpaired
  • The skull is divided into the neurocranium and the viscerocranium

Bones of the Skull: Unpaired

  • Frontal
  • Vomer
  • Ethmoid
  • Sphenoid
  • Mandible
  • Occipital

Bones of the Skull: Paired

  • Parietal
  • Temporal
  • Zygomatic
  • Palatine
  • Maxilla
  • Lacrimal
  • Inferior concha
  • Nasal
  • Ear ossicles (Malleus, Incus, Stapes)

Skull Classification: Developmental

  • Intramembranous ossification
  • Endochondral ossification

Skull Classification: Functional

  • Neurocranium
  • Viscerocranium

Cranial Base

  • Forms the floor of the cranial cavity
  • Contains many foramina and fissures
  • Foramina are openings through which structures like nerves and blood vessels pass

Cranial Fossae

  • Large, stair-stepped depressions
  • Form the bowl-shaped floor of the cranial cavity
  • They are filled by the brain
  • Three fossae
    • Anterior
    • Middle
    • Posterior

Sella Turcica

  • Part of the sphenoid bone
  • Resembles a Turkish saddle
  • Houses the pituitary gland
  • Three parts
    • Tuberculum sellae
    • Hypophyseal fossa
    • Dorsum sellae

Fontanelles

  • Fibrous areas in the neonatal skull
  • Areas where several sutures meet
  • Allow for brain growth
  • Types of fontanelles
    • Anterior
    • Posterior
    • Sphenoid
    • Mastoid

Sutures

  • Fibrous joints of cranial bones
  • Types of sutures
    • Coronal
    • Sagittal
    • Lambdoid
    • Sqamous

Cranial Nerves

  • Cranial nerves emerge from the cranium through foramina or fissures
  • Numerous nerves

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