accessory medullary lamina of globus pallidus

accessory medullar lamina of pallidum

Thin bundle of myelinated axons that divides the medial pallidal segment into outer and inner portions (Carpenter, Core Text of Neuroanatomy, 3rd ed., 1985, pg. 303).

Type Organ
Nom latin accessory medullar lamina of pallidum
FMA ID 62471

Questions fréquentes

What is the accessory medullary lamina of globus pallidus?
The accessory medullary lamina of globus pallidus (accessory medullar lamina of pallidum) is a thin bundle of myelinated axons (white matter) that divides the medial segment (internal segment) of the globus pallidus into distinct outer and inner portions. It is a fiber plate within this deep brain structure.
Where is the accessory medullary lamina of globus pallidus located?
The accessory medullary lamina is located within the globus pallidus — a part of the basal ganglia deep within the cerebral hemisphere. Specifically, it lies within the medial (internal) pallidal segment (GPi), dividing it into two functional sub-regions.
What is the function of the accessory medullary lamina of globus pallidus?
The accessory medullary lamina serves as an organizational boundary within the medial globus pallidus, separating neuron populations with potentially distinct connectivity patterns and functions. The neurons on either side of this lamina may project to different targets — the thalamus or brainstem — as part of the basal ganglia output circuit.
What conditions can affect the accessory medullary lamina of globus pallidus?
The globus pallidus and its internal organization are relevant to movement disorders, particularly Parkinson's disease and dystonia. Deep brain stimulation (DBS) targeting the globus pallidus internus (GPi) must account for the internal anatomy including the accessory lamina for optimal electrode placement and therapeutic efficacy.
How is the accessory medullary lamina different from the medial medullary lamina?
The medial medullary lamina of the globus pallidus is the main myelinated fiber plate separating the external (GPe) and internal (GPi) pallidal segments, while the accessory medullary lamina is an additional, smaller subdivision specifically within the GPi, creating two sub-portions of the internal segment.

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Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.