At weeks 3-4 what are the parts of the neural tube?
What is the most anterior/rostral vesicle?
Prosencephalon or forebrain
What is the central vesicle?
Mesencephalon - midbrain
What is the most posterior vesicle?
Rhombenecephalon - hindbrain
What are the 5 dilations at the cephalic end of of neural tube at week 5?
What will the Telencephalon develop into?
What will the Diencephalon develop into?
- -Thalamus, Hypothalamus, epithalamus
- -The more dorsal portion will be the pineal gland and the more ventral will be the pituitary gland, third ventricle.
What feature does the Mesencephalon have running through it?
The midbrain as well as the Cerebral Aquaduct
The Rhombencephalon develops into what 2 structures?
The more anterior of the Rhombencephalon is?
Metencephalon which will become the pons and the cerebellum
The more posterior portion of the Rhombencephalon is?
Myelencephalon which will become the medulla
The lumen of the spinal cord is continuous with the lumen of the brain allowing what to flow freely between the brain and the cord?
The 4th ventricle opens into the ____ via the foramina of ______ and ____
- subarachnoid space
- Luscka and Magendie
After the neural tube is closed what type of cell resides in it?
neuroepithelium (derived from neuroectoderm)
What is the zone that surrounds the neuroepithelium?
Mantle which will become grey matter (cell bodies)
What is the outer most layer of the cord which contains nerve fibers emerging from the mantle?
Marginal zone which will be white matter
The basal motor plate of the Myelencephalon contains motor nuclei divided into what 3 groups?
- 1) General Somatic Efferent - medial
- 2) Special Visceral Efferent - intermediate
- 3) General Visceral Efferent - lateral
General Somatic Efferent (motor) - myelencephalon
Innervates all skeletal muscle except the Trapz and SCM. Tongue, eye muscles, abs, etc...
Special Visceral Efferent - myelcephalon
- -Derived from Pharyngeal arches and innervated by CN ix, x, xi
- - innervated trapz and SCM
General Visceral Efferent - myelencephalon
- -involved in gut movement and parasympathetic, rest and digest.
- -CN x
The Alar plate of the Myelencephalon contains sensory relay nuclei and divides into what 3 groups?
- 1) General Visceral Afferent -medial
- 2) Special Visceral Afferent - intermediate
- 3) General Somatic Afferent - lateral
General Visceral Afferent - myelencephalon
receives info from heart and GI tract. pain and fullness. CN x
Special Visceral Afferent - myelencephalon
- Chemoreception - taste buds of tongue, palate, oropharynx and epiglottis.
- CN vii, ix, x
General Somatic Afferent - myelencephalon
- Both general and specific. Touch, pain, temperature, itch, conscious kinesthesia and proprioception
- CN vii, v , ix, x
The Metencephalon forms what 2 special components?
- Cerebellum ( movement and equilibrium)
- Pons ( pathway between the cord, cerebellum and cerebrum)
General Somatic Efferent - metencephalon
goes to abducens - lateral rectus muscle of eye
Special Visceral Efferent - metencephalon
- pharyngeal arches
- CN v - muscles of mastication
- CN vii - facial expression
General Visceral Efferent - Metencephalon
parasympathetic - CN vii - secretomotor, lacramation, nasal glands, salvation
General Visceral Afferent - metencephalon
gut movement, pain, temperature CNx
Special Visceral Afferent - metencephalon
CN vii - taste
General Somatic Afferent - metencephalon
The dorsolateral parts of the Alar plates bend medially to create what structure in the metencephalon?
What structure and where is formed by the fusion of the Rhombic Lips?
Cerebellum and in the metencephalon
The most prominent fissures divide the cerebellum into 3 lobes.
- 1) Anterior
- 2) Posterior
- 3) Flocculonodular
What is the Anterior lobe of the cb responsible for?
What is the posterior lobe of the cb responsible for?
- -motor and ballistic learning
- -learned motor function
- -crawl, walk, run, speech
- -thinking in language is a motor function
What is the Flocculonodular lobe of the cb responsible for?
Both the basal and alar plates of the mesencephalon are easily seen and separated by...
In the Mesencephalon the basal plate gives rise to neurons of the tegmentum and crus cerebri, may be divided into 2 groups of motor nuclei.