The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 226 THE DEVELOPMENT OF THE SKULL. [CHAP. from its relations to the notochord, and as such we shall continue to speak of it. The second of the two divisions into which the parts of the skull fall, consists of a series of paired rods, whose proximal extremities are attached more or less closely to the investing mass. All of these (with the exception of the trabeculse) are developed along the axes of the visceral arches. EiG. 68. cvl View feom above oe the Investing Mass and op the Teabecul^ on TH
The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 226 THE DEVELOPMENT OF THE SKULL. [CHAP. from its relations to the notochord, and as such we shall continue to speak of it. The second of the two divisions into which the parts of the skull fall, consists of a series of paired rods, whose proximal extremities are attached more or less closely to the investing mass. All of these (with the exception of the trabeculse) are developed along the axes of the visceral arches. EiG. 68. cvl View feom above oe the Investing Mass and op the Teabecul^ on THE Fourth Day op Incubation. {From Parker.) In order to shew this the â whole of the upper portion of the head has heen sliced away. The cartilaginous portions of the skull are marked with the dark horizontal shading. cv I cerebral vesicles (sliced off), e eye. nc notochord. iv investing mass. 9 foramen for the exit of the ninth nerve, cl cochlea, hsc horizontal semicircular canal, g quadrate. 5 notch for the passage of the fifth nerve. Ig expanded anterior end of the investing mass, pts pituitary space. tr trabeculoe. The reference line tr has accidentally been made to end a little short of the cartilage. 'We shall commence by describing the 'investing mass* as we find it on the fourth day, and from this pass on to the paired rods attached to it.
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