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alar plate (dorsolateral), alar plate(s), basal plate, basal portion of pons, basis pedunculi area, bifurcation of basilar artery, cerebral aqueduct (mesocoele), ectomeninx, endomeninx, median sulcus, mesencephalon (midbrain), metencephalon: rhombic lip (cerebellum), myelencephalon (medulla oblongata), oculomotor nerve (CN III), posterior communicating artery, region of cephalic flexure, rhombencoel (fourth ventricle), roof of rhombencoel (fourth ventricle), roof plate, roof plate (dorsal), sulcus limitans, superior cerebellar artery, tectum, tegmentum, tegmentum of pons, trochlear nerve (CN IV)

A section through the alar plate of the myelencephalon.

Observe:
1. A transverse section through the mesencephalon showing its major subdivisions.
2. The region of the cephalic flexure containing the oculomotor nerve and the bifurcation of the basilar artery.
3. The major subdivisions of the metencephalon.
4. The superior cerebellar artery coursing laterally on the ventral surface of the metencephalon.
5. The two subdivisions of the primitive meninx lateral to the myelencephalon: ectomeninx and endomeninx.


Keywords: alar plate (dorsolateral), alar plate(s), basal plate, basal portion of pons, basis pedunculi area, bifurcation of basilar artery, cerebral aqueduct (mesocoele), ectomeninx, endomeninx, median sulcus, mesencephalon (midbrain), metencephalon: rhombic lip (cerebellum), myelencephalon (medulla oblongata), oculomotor nerve (CN III), posterior communicating artery, region of cephalic flexure, rhombencoel (fourth ventricle), roof of rhombencoel (fourth ventricle), roof plate, roof plate (dorsal), sulcus limitans, superior cerebellar artery, tectum, tegmentum, tegmentum of pons, trochlear nerve (CN IV)

Source: Atlas of Human Embryos.