colliculi

It forms, together with the superior peduncle, the roof of the upper part of the fourth ventricle; it is narrow above, where it passes beneath the inferior colliculi, and broader below, where it is continuous with the white substance of the superior vermis.

IX. Neurology. 4a. The Hind-brain or Rhombencephalon 1918

The longitudinal part of this sulcus expands superiorly to form a slight depression which supports the pineal body, a cone-like structure which projects backward from the thalamencephalon and partly obscures the superior colliculi.

IX. Neurology. 4b. The Mid-brain or Mesencephalon 1918

A slightly elevated ridge, the frænulum veli, descends upon its upper part from between the inferior colliculi, and on either side of this the trochlear nerve emerges.

IX. Neurology. 4a. The Hind-brain or Rhombencephalon 1918

They are joined to each other across the middle line by the anterior medullary velum, and can be followed upward as far as the inferior colliculi, under which they disappear.

IX. Neurology. 4a. The Hind-brain or Rhombencephalon 1918

The anterior notch lies close to the pons and upper part of the medullas, and its superior edge encircles the inferior colliculi and the superior cerebellar peduncle.

IX. Neurology. 4a. The Hind-brain or Rhombencephalon 1918

Transverse section of mid-brain at level of superior colliculi.

Illustrations. Fig. 712 1918

Subsequently two oblique furrows extend medialward and backward, and the thickened lamina is thus subdivided into the superior and inferior colliculi.

IX. Neurology. 2. Development of the Nervous System 1918

The spinotectal fasciculus, as its name indicates, is supposed to have its origin in the gray matter of the cord and terminations in the superior and inferior (?) colliculi of the mid-brain serving for reflexes between the cord and the visceral and auditory centers of the mid-brain.

IX. Neurology. 4d. Composition and Central Connections of the Spinal Nerves 1918

The pineal body (epiphysis) is a small reddish-gray body, about 8 mm. in length which lies in the depression between the superior colliculi.

XI. Splanchnology. 4e. The Pineal Body 1918

The superior peduncle (page 792), on emerging from the central white substance of the cerebellum, pass upward and forward, forming at first the lateral boundaries of the upper part of the cavity; on approaching the inferior colliculi, they converge, and their medial portions overlap the cavity and form part of its roof.

IX. Neurology. 4a. The Hind-brain or Rhombencephalon 1918