EXAM QUESTIONS: MIDTERM 1 Flashcards
Nuclei of the cerebellum:
1) Dentate
2) Fastigial
3) Emboliform
4) Globose
Lateral ventricle
Anterior horn/ FRONTAL HORN
Lies rostrally to interventricular foramen.
Lateral wall: Head of caudate nucleus.
Medial wall: septum pellucidum
Floor – Anterior – Roof: radiation of corpus callosum (rostrum, genu and body)
Body
Roof: corpus callosum
Floor: dorsal aspect of thalamas covered by lamina affixa. Lateral: body of caudate nucleus.
Medial: choroid lamina epithelialis (ependymal cells).
Posterior horn
Lateral: tapetum of corpus callosum
Medial wall: calcar avis
Other walls are formed by the white matter of the occipital lobe.
Inferior horn/TEMPORAL
Floor: hippocampus
Roof. Tapetum
Medial: tail of caudate nucleus and stria terminalis
Third ventricle:
Lateral: thalamus, hypothalamus.
“ Roof: Ependymal layer (chroroid lamina epithelialis)
“ Floor: hypothalamus, optic chiasm, infundibulum, mamillary bodies and subthalamus.
“ Anterior: anterior commissure, columns of fornix and lamina terminalis.
“ Posterior: habenular comissure and posterior commissure.
Fourth ventricle
” Roof: superior medullary velum, inferior medulalry velum, nodule of the cerebellum and the tela choroidea.
“ Floor: rhomboid fossa.
**Ependymal layer originates from the roof plate of the neural tube.
Through the lateral foramen of Luschka the flower basket of Bochdalek protrude into the subarachnoud space. Pineal body has pinealocytes, which synthetize serotonin (growth hormone) and melatonin (sleep hormone).
Attachments of the spinal cord:
” Denticulate ligament (21) (continuation of pia mater)
“ Filum terminale
“ Spinal nerve roots
***Cervical intumescence (enlargement): C5 – T1, brachial plexus. Lumbar intumescence: L2 – S4, lumbosacral plexus.
Average length: 45cm. Terminates at conus medullaris (L1 – L2)
Arterial supply of the spinal cord:
” Ant. spinal artery
“ Post. spinal arteries
“ Segmental arteries
Venous drainage of the spinal cord:
” Internal vertebral plexus of Batson (valveless venous system) (bidirectional flow).
Paired cistern:
Lateral pontine cistern,
ambient cistern,
crural cistern,
carotic cistern.
Unpaired cistern:
Cisterna magna,
median pontine cistern, interpeduncular cistern, chiasmatic cistern,
cistern of lamina terminalis, supracallosal cistern
cistern of great cerebral vein.
**Neural tube cranial to 4th pair of somites develops into the brain.
Brain flexures:
” Midbrain flexure
“ Pontine flexure
“ Cervical flexure
*Basal plate!GSE, SVE, GVE. (motor area)
Alar plate!GVA, SVA, GSA, SSA, olivary nucleus. (sensory area)
The cerebellum develops from thickenings of the dorsal parts of the alar plates.
Sulcus limitans divide the basal plate and alar plate.
BASAL PLATE
GSE
SVE
GVE (MOTOR AREA)
ALAR PLATE
GVA SVA GSA SSA OLIVARY NUCLEUS ( SENSORY AREA)
Pituitary gland is ectodermal in origin:
” Adenohypophysis: upgrowth from the ectodermal roof of the stomadeum (glandular part). Rathke ́s pouch.
“ Neurohypophysis: downgrowth from the neuroectoderm of the diencephalon (neural part).
Derivatives of neural crest:
” PNS (spinal sensory and autonomic ganglia, parts of ganglia of CN., Schwann cells and leptomeninx).
“ Medulla of suprarenal gland.
“ Melanocytes (pigment cells of the skin).
“ Skeletal and muscular components of the head.
Recesses of 3rd ventricle
Recesses of 3rd ventricle " Suprapineal recess " Pineal recess " Triangular recess " Optic recess " Infundibular recess
Tela choroidea:
” Choroid lamina epithelialis
“ Pia mater
Hemi-decussation in the optic chiasm:
” Nasal fibers decussate and temporal fibers remain ipsilateral (same side).