6o DISSECTION OF THE CAT 



bands of fibres, lying on either side of the mid- 

 ventral line, just posterior to the pons. They are 

 a direct continuation of the fibres of the medulla. 

 (Plate VII., A.) 



6. The Corpus Trapezoides is a transverse band of 

 fibres, posterior to the pons Varolii, covered, in 

 the mid-line, by the anterior pyramids. (Plate 

 VII., A.) 



7. The Olivary Body is the oval elevation just pos- 

 terior to the corpus trapezoides and lateral to the 

 anterior pyramids. (Plate VII., a.) 



8. The seventh pair of cranial nerves, the Facial, 

 leave the surface of the brain at the outer anterior 

 angles of the corpus trapezoides. (Plate VII., a.) 



9. The eighth pair of cranial nerves, the Auditory, 

 emerge from the brain at the outer borders of the 

 corpus trapezoides, just posterior to the origin of 

 the seventh. (Plate VII., a.) 



C. — Medulla Oblongata. 



1. The Medulla Oblongata is the part of the brain 

 lying posterior to, and below, the cerebellum. It 

 is the expanded anterior portion of the spinal cord, 

 and is composed of a dorsal, a lateral, and a ven- 

 tral pair of fibrous bundles. (Plate VII., a and 



c.) 



2. The Posterior Pyramids are the two dorsal bun- 

 dles of fibres, lying one on either side of the me- 

 dian fissure. Anteriorly they blend with the res- 

 tiform bodies. 



