Olivary body

Olivary body

The medulla, showing the olivary bodies lying adjacent to the pyramids.

Transverse section of medulla oblongata below the middle of the olive.
Details
Part of Medulla
Identifiers
Latin oliva
MeSH A08.186.211.132.810.406.574
Dorlands
/Elsevier
o_02/12589442

Anatomical terms of neuroanatomy

In anatomy, the olivary bodies or simply olives (Latin oliva and olivae, singular and plural, respectively) are a pair of prominent oval structures in the medulla oblongata, the lower portion of the brainstem. They contain the olivary nuclei.

Structure

The olivary body is located on the anterior surface of the medulla lateral to the pyramid, from which it is separated by the antero-lateral sulcus and the fibers of the hypoglossal nerve.

Behind (dorsally), it is separated from the postero-lateral sulcus by the ventral spinocerebellar fasciculus. In the depression between the upper end of the olive and the pons lies the vestibulocochlear nerve.

In humans, it measures about 1.25 cm. in length, and between its upper end and the pons there is a slight depression to which the roots of the facial nerve are attached.

The external arcuate fibers wind across the lower part of the pyramid and olive and enter the inferior peduncle.

Olivary nuclei

The olive consists of two parts:

The inferior olive in itself is divided to 3 main nuclei:

Small additional inferior olivary structures consist of the dorsal cap of Kooy and the ventrolateral outgrowth.

Additional images

External links

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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