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What are the parts of the skull?

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ahuerta | Student, Undergraduate | eNotes Newbie

Posted June 14, 2010 at 4:10 AM via web

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What are the parts of the skull?

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ako6777 | Middle School Teacher | (Level 1) Associate Educator

Posted June 14, 2010 at 4:25 AM (Answer #1)

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The skull is made up of multiple cranial bones. 

  • Frontal- this part of the skull forms the brow, forhead, and nasal cavity. 
  • Parietal- these bones are located on opposite sides of the skull.  On is on the left and a one is on the right side of the skull.
  • Temporal-these bones also occur on both sides of the brain.  It has a left and right section.
  • Occipital-this bone is on the lower back side of the brain.
  • Sphenoid-this part of the skull forms the floor of the cranium and part of the eye orbit.
  • Ethmoid-this bone forms the medial parts of the orbits and the roof of the nasal cavity.

There are joints between the bones called sutures. The parietal bones are joined by the sagittal suture. Where the frontal bone meets the parietal bones the suture is called the coronal suture.The parietal and occipital bones meet at the lambdoidal suture. The suture between the parietal and temporal bones is called the squamos suture.

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besure77 | Middle School Teacher | (Level 1) Senior Educator

Posted June 14, 2010 at 5:43 AM (Answer #2)

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The skull is comprised of two main parts: the cranium and the mandible. The main purpose of the skull is to protect the brain from injury. A normal adult has 22 bones that make up the skull. The bones are fused together by sutures (except for the mandible). There are 8 bones which make up the neurocranium and 14 bones that make up the splanchnocranium.

The purpose of the neurocranium is to support and protect the brain. It bones consist of one frontal, two parietals, one ocipital, one sphenoid, two temporals, and one ethmoid.The splanchnocranium consists of bones that support the face.

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dano7744 | College Teacher | (Level 2) Educator

Posted June 14, 2010 at 6:00 AM (Answer #3)

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The human skull or cranium protects the brain. It serves a noble function. The skull is composed of many bones.

1. frontal bone- the frontal bone is your forehead.

2. temporal bones-form the sides and base of the skull.

3. sphenoid-forms part of the base and sides of the orbits. (eyesocket).

4. ethmoid- helps form the floor,posterior nose, and the orbit.

5. 2 nasal bones, 2 zygomatic bones,two maxillery bones, 2 palatine bones, 2 lacrimal bones, the vomer bone, mandible, and TMJ joint.

 The zygomatics are the cheekbones, the lacrimal bones house the tear ducts, the upper jaw is the maxilla, the lower jaw is the mandible, the vomer helps form your nasal septum.

 

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krishna-agrawala | College Teacher | Valedictorian

Posted June 14, 2010 at 1:23 PM (Answer #4)

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Skull is the skeleton or the bony frame of the head of human beings and other animals with backbones.  It is a case made up of bones that enclose the brain called cranium, and bones that form the face.  The skull of adult humans has 22 bones.

The cranium is made up of eight bones. These include occipital, at the back of the skull; the sphenoid, at the base of the skull; two parietal bones, at the top and sides; two temporal bones, above the ears; the frontal, at the forehead; and the ethmoid, at the nose.  Remaining 14 bones of the skull, called facial bones,  form the face and the jaw. These include nasal bone, lacrimal bone, maxilla, vomer, zygomatic bone, palatine bone, and mandible. Except for the mandible all the skull bones of an adult form a rigid, united structure.

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tejaa | High School Teacher | eNotes Newbie

Posted June 14, 2010 at 4:04 PM (Answer #5)

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Parts of Skull Bones

Frontal

  • frontal sinus (air cavity that opens into the nasal cavity)
  • coronal suture (joint between frontal and parietal bones)

Parietal

  • sagittal suture (joint between the two parietal bones)

Temporal

  • squamosal suture (joint between temporal and parietal bone)
  • external auditory meatus (the ear canal)
  • mastoid process (oval projection behind the ear canal)
  • mastoid sinus (air cavity that opens into the middle ear)
  • mandibular fossa (oval depression anterior to the ear canal – articulates with mandible)

Occipital

  • foramen magnum (large opening for the spinal cord)
  • condytes (oval projections on either side of foramen magnum that articulates with the atlas)
  • lambdoidal suture (joint between occipital and parietal bones)

Sphenoid

  • greater wing (flat, lateral portion between the frontal and temporal bones)
  • sella turcica (central depression that encloses the pituitary gland)
  • sphenoid sinus (air cavity that opens into the nasal cavity)

Ethmoid

  • ethmoid sinus (air cavity that opens into nasal cavity)
  • crista galli (superior projection for attachment of meninges)
  • cribriform plate and olfactory foramina (on either side of base of crista galli – olfactory nerves pass through foramina)
  • perpendicular plate (upper part of nasal septum)
  • conchae - four are part of ethmoid and two inferior are separate bones (shelf-like projections into nasal cavities, which increase surface area of nasal mucosa)

Mandible

  • body (U-shaped portion with lower teeth)
  • condyles (oval projections that articulate with the temporal bones)
  • sockets (conical depressions that hold roots of lower teeth)

Maxilla

  • maxillary sinus (air cavity that opens into nasal cavity)
  • palatine process (projection that forms anterior part of hard palate)
  • sockets (conical depressions that hold roots of upper teeth)

Nasal bones form the bridge of the nose.

Lacrimal

  • lacrimal canal (opening for nasolacrimal duct to take tears to nasal cavity)

Zygomatic bones form point of cheek and articulate with frontal, temporal and maxillae bones.

Palatine bones form the posterior part of the hard palate.

Vomer forms the lower part of the nasal septum.

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