University of Mount Saint Vincent

Skull Anatomy Study Tips

  • Understanding Skull Anatomy: Important to study the skull using both colored and neutral colored skull models.

    • Use colored skulls to identify bones easily.

    • Use neutral colored skulls to practice identification without dependence on colors.

    • Example practice: Label parts like the temple bone with tape and compare skulls.

  • Use Resources: Consider using applications like Visible Body to explore different bone types interactively.

Key Sutures of the Skull

  • Four Major Sutures:

    • Coronal Suture: Connects frontal bone to parietal bones.

    • Squamous Suture: Connects temporal bone to parietal bones.

    • Lambdoid Suture: Connects occipital bone to parietal bones.

    • Sagittal Suture: Splits the two parietal bones.

  • Understand Borders: Recognize what each suture connects to.

Temporal Bone Features

  • Key Parts of the Temporal Bone:

    • Mastoid Process: Located behind the ear, identifiable as a bump.

    • Styloid Process: A pointed spike that also extends out.

    • External Acoustic Meatus: An opening that functions as a tube.

    • Mandibular Fossa: A dent where the mandible articulates.

Inside the Skull

  • Foramen Magnum:

    • A large hole where the brainstem connects to the spinal cord.

    • Located in the occipital bone.

  • Sphenoid Bone Structure:

    • Shaped like a bat wing; contains the Sella Turcica.

    • Houses the pituitary gland, significant to the endocrine system.

Important Features of the Ethmoid Bone

  • Two Main Parts:

    • Crista Galli: A small ridge in the ethmoid bone.

    • Cribriform Plate: Contains holes for olfactory nerves (sense of smell).

  • Relevance: Trauma to this bone can lead to loss of smell due to damage to the olfactory nerves.

Identification of Cranial Nerves and Foramens

  • Various Foramens:

    • Important for cranial nerves and blood supply entry/exit from the skull.

Mandible and Inferior Skull View

  • Inferior View Identifications:

    • Occipital Condyles: Support the first cervical vertebra.

    • Zygomatic Process: A bony bridge which may fracture easily.

Sinuses in the Skull

  • Four Main Sinuses:

    • Frontal, ethmoid, sphenoid, maxillae.

    • Function: Lighten the skull and amplify voice resonance.

    • Implications for sinus infections and conditions like allergies.

Hyoid Bone Characteristics

  • Unique as it does not articulate with any other bone.

  • Connected to the tongue, epiglottis, and larynx, important for speech and swallowing.

  • Position: Found in the anterior cervical region.

Fetal Skull Development

  • Skull Proportions: Fetal skull occupies about 25% of body length.

  • Fontanelles: Fibrous membranes instead of sutures, allowing for compressibility during childbirth.

    • Develops into sutures by age two.

    • Key fontanelles: anterior, posterior, mastoid, and sphenoid.

Vertebral Column Overview

  • Regions of the Spine:

    • Cervical: 7 vertebrae (C1–C7).

    • Thoracic: 12 vertebrae (T1–T12).

    • Lumbar: 5 vertebrae (L1–L5).

    • Sacral: 5 fused vertebrae.

    • Coccyx: Often 2-5 tiny bones fused together.

  • Curvature:

    • At birth, the spine has a primary curve (C-shaped).

    • As the child develops (especially through crawling and standing), secondary curves form in the cervical and lumbar regions.

    • Abnormalities: Scoliosis (lateral curve), Kyphosis (exaggerated thoracic curvature), Lordosis (exaggerated lumbar curvature).

Maintaining Spinal Health in Children

  • Importance of crawling and other movements to develop healthy spinal curvature.

  • Consequences of early intervention devices on spine development.

Potential Spinal Conditions

  • Compression Fractures: Usually occur due to conditions like osteoporosis, leading to changes in spinal shape.

  • Curvature Issues: Can develop due to poor posture or lifestyle factors.

    • Hyperlordosis: Increased lumbar curvature, often seen in obesity, pregnancy, and certain athletic conditions.