medullary laminae of thalamus medullary laminae of thalamus medullary laminae of thalamus are layers of myelinated fibres that appear on cross sections of the thalamus. they also are commonly referred to as laminae medullares thalami or medullary layers of thalamus. the specific layers are: lamina medullaris lateralis (external medullary lamina) - separates ventral and lateral thalamus from the subthalamus and thalamic reticular nucleus lamina medullaris medialis (internal medullary lamina) - positioned between the dorsomedial and ventral nuclei of thalamus, encloses the intralaminar nuclei (centromedian nucleus, paracentral, and central lateral) medullary laminae of thalamusthalamic nucleidetailsidentifierslatinlamina medullaris lateralis thalami, lamina medullaris medialis thalamineuronames234, 235ta98a14.1.08.660 a14.1.08.661 a14.1.09.508 a14.1.09.510ta25682anatomical terms of neuroanatomy