Brain Anatomy Study Notes

Study Focus

  • Study the brain anatomy on both the model and the sheep brain in preparation for the exam.
  • Exam will require knowledge of both models and sheep brain anatomy.

Model vs. Sheep Brain

  • Certain anatomical structures will only be visible on the model or sheep brain.
    • Model Only: Lateral fissure (sulcus)
    • Sheep Brain Only: Meninges
    • Both: Most other structures in the list

Main Brain Parts

  • The lecture will cover the major structures of the brain, typically in solid black bullet points, and will skip complex anatomy details for the initial review.

Key Terms and Structures

  • Cerebrum: Outer covering of the brain; contains gyri (ridges) and sulci (grooves).
    • Functionality: Increased surface area due to neural complexity; wrinkling allows for more neuron connections.
  • Gyri: Ridges of the cerebrum; vary between individuals like fingerprints.
  • Sulci: Grooves where cerebrum dips down; found adjacent to gyri.

Brain Halves

  • Hemispheres: Left and right cerebral hemispheres separated by the longitudinal fissure.
  • Functionality: Right side associated with creativity; left side is analytical (logic and language).
  • Communication: Achieved through the corpus callosum, which connects the two hemispheres.

Cerebrum Lobes

  • Named after the skull bones:
    • Frontal Lobe: Anterior part of the cerebrum.
    • Parietal Lobe: Superior to the temporal lobe, posterior to the frontal lobe.
    • Occipital Lobe: Responsible for vision, located at the back of the brain.
  • Cerebellum: Located posterior and inferior to the cerebrum; responsible for coordination.
  • Brain Stem: Connects the brain to the spinal cord; includes:
    • Medulla Oblongata: Lowest part of the brain stem.
    • Pons: Swelled area above the medulla.
    • Midbrain: Superior to the pons, forming a hook shape.

Diencephalon

  • Thalamus: Round structure critical for sensory processing, located centrally.
  • Hypothalamus: Below the thalamus, involved in regulating bodily functions.
  • Pituitary Gland: Located below the hypothalamus, important for hormone regulation.

Ventricles of the Brain

  • Lateral Ventricles (1 & 2): One in each cerebral hemisphere.
    • Third Ventricle: Sits beneath the corpus callosum, typically not visible in models.
    • Cerebral Aqueduct: Connects the third and fourth ventricles, allowing cerebrospinal fluid flow.
    • Fourth Ventricle: Diamond-shaped opening between the pons and cerebellum; drains into the central canal.

Summary of Study Tips

  • Review pictures of the sheep brain uploaded for better understanding when not in class.
  • Prepare to identify parts on both the sheep brain and the model for the exam.
  • Engage with lab lists highlighting structures seen on each model to optimize study effectiveness.