AHE: BLOCK 2: CNS: HISTOLOGY & DEVELOPMENT

Which adult structure is formed from the prosencephalon?

What structure develops from the basal plates during spinal cord development?

Which event occurs first during the development of the spinal cord?

How do sulci and gyri typically develop?

Which structure is formed from the metencephalon?

Which structure is associated with sensory neuron cell bodies during the development of the spinal cord?

Which of the following is NOT a part of the diencephalon?

What function do the alar plates serve in spinal cord development?

What primarily differentiates the gray matter in the CNS?

Which of the following is NOT a component of a nerve?

Which of the following correctly describes the neural tube's role in CNS development?

What does the neural crest give rise to?

During which week of development does neurulation begin?

The structure that primarily forms the ventricles and central canal is the:

What distinguishes the alar plate from the basal plate in CNS development?

What is primarily found in the gray matter of the cerebellum?

CNS Histology

Cerebrum: Gray matter contains neurons, white matter contains myelinated axons
Cerebellum: Gray matter contains neurons, white matter contains myelinated axons
Spinal Cord: Gray matter contains neurons, white matter contains myelinated axons
Ganglion: Contains neurons, axons, myelin sheath
Nerves: Contains axons (nerve fibers) and myelin sheath
Nerve Fascicle: Contains bundles of axons (nerve fibers)
Epineurium: Outermost layer of connective tissue around nerve
Perineurium: Connective tissue sheath surrounding individual nerve fascicles
Endoneurium: Layer of connective tissue surrounding each axon within a fascicle

CNS Development

Week 3:
- Neurulation begins
- Neuroplate forms
- Neural tube forms
Week 5:
- Three brain vesicles formed:
  - Prosencephalon: Forms the forebrain
  - Mesencephalon: Forms the midbrain
  - Rhombencephalon: Forms the hindbrain
Adult brain:
- Prosencephalon:
  - Telencephalon: Forms the cerebrum and lateral ventricles
  - Diencephalon: Forms the thalamus, hypothalamus, epithalamus, and third ventricle
- Mesencephalon: Forms the midbrain and cerebral aqueduct
- Rhombencephalon:
  - Metencephalon: Forms the pons and cerebellum
  - Myelencephalon: Forms the medulla oblongata and fourth ventricle
Sulci and gyri develop late in fetal development, formed at birth
Spinal cord:
- Alar plate: Forms the posterior horn, contains sensory neuron cell bodies of dorsal root ganglia
- Basal plate: Forms the anterior horn, contains motor neuron cell bodies
- Neural canal becomes central canal

Test your knowledge on the histology and development of the central nervous system (CNS). This quiz covers essential aspects such as the structure of the cerebrum, cerebellum, spinal cord, and the stages of CNS development during crucial weeks. Perfect for students studying neuroanatomy and developmental biology.