3.1 Organisation of CNS

Question 1

Neurulation

Answer 1

Forms the ectoderm, outermost germ layer
Neuroectoderm thickens into neural plate
Neural Groove forms rostral to caudal, walls of the groove form neural folds
Neural Folds move together and fuse to form the neural tube, with which the CNS develops from.

Question 2

Cerebrum

Answer 2

Conscious thought processes, intellectual functions, memory
Commissural Fibers: bands of fibers connecting the two hemispheres, corpus callosum and anterior commissure
Projection Fibers: link cerebral cortex to diencephalon, brainstem, cerebellum and spinal cord passing through the diencephalon.

Question 3

Cerebellum

Answer 3

Coordinates repetitive body movements
Program and fine-tune conscious and subconscious movements

Question 4

Diencephalon

Answer 4

Thalamus: relays and processes sensory information
Hypothalamus: controls emotions, autonomic functions and hormone production

Question 5

Brain Stem

Answer 5

Midbrain: processes visual and auditory data
Pons: relays sensory information to cerebellum and thalamus
Medulla: relays sensory information to the thalamus and other portions of the brain stem.

Question 6

Primary Brain Vesicles

Answer 6

Prosencephalon(forebrain)
Mesencephalon(midbrain)
Rhombencephalon(hindbrain)

Question 7

Prosencephalon(forebrain)

Answer 7

Divides into the telencephalon and diencephalon at 6 weeks
Telencephalon becomes the cerebrum
Telencephalon forms the lateral ventricles, whilst diencephalon forms the third ventricles

Question 8

Mesencephalon(midbrain)

Answer 8

Becomes the midbrain at birth
Associated with the cerebral aqueduct

Question 9

Rhombencephalon(hindbrain)

Answer 9

Divides into the metencephalon and myelencephalon
Metencephalon forms cerebellum and pons, while myelencephalon forms the medulla oblongata
Both contribute the fourth ventricle