Figure 7
The buccohypophyseal canal in the holocephalan Callorhinchus . (a) Sagittal section obtained from synchrotron X-ray microtomography from specimen AMNH 257784, showing the pituitary region (arrowhead). (b) The pituitary gland has recesses on both sides of the sphenoid (outlined in blue). (c) Three-dimensional reconstruction in ventral view showing the pharyngeal pituitary connected to the intracranial pituitary by a long stalk (arrowhead) with zones of cartilage fusion appearing.