Development Of NS Flashcards
What type of embryonic cells does the NS (and skin) derive?
Ectoderm
From what do the brain and SC (CNS) originate?
Neural tube
From what do PNS neurones originate?
Neural crest
What embryonic cells form somites?
What do somites develop into?
Mesoderm
Vertebrae of SC and skeletal muscles
What forms in initial differentiation?
Primary vesicles:
- PROSENCEPHALON (forebrain)
- Mesencephalon (midbrain)
- RHOMBENCEPHALON (hindbrain)
Further differentiation forms secondary vesicles. What are the secondary vesicles of the forebrain (prosencephalon)?
Optic vesicles —> optic nerve
Telencephalon —> cerebral hemispheres
The roof (dorsal surface) of the mesencephalic vesicle becomes?
TECTUM
Superior and inferior colliculus
The floor of the midbrain becomes?
TEGMENTUM
Substantia nigra and red nucleus
What secondary vesicle is the rostral half of the hindbrain that develops into the pons and cerebellum?
Metencephalon
Myelencephalon is the caudal half of the hindbrain and develops into?
Medulla
What part of the SC is the grey matter between the dorsal and ventral horns involved in autonomic control?
Intermediate zone
Thalamus and hypothalamus are derived from?
Diencephalon
Surface of brainstem attached to cerebellum is the ventral or dorsal surface?
Dorsal
Groups of cell bodies in the CNS form a?
Nucleus
Groups of axons in PNS?
Nerve
