BIO380H5 Lecture Notes - Lecture 21: Paraxial Mesoderm, Lateral Plate Mesoderm, Nasal Placode
Document Summary
Chondrocranium- associated with brain and major sense organs (nose, eyes, ears) Viscerocranium- a series of pharyngeal arches associated with the oral regoon and the pharynx. As complexity increases, dermocranium forms with the formation of dermal bones of the skull; forebrain also forms the telencephalon and diencephalon) Pharyngeal region and hindbrain are highly segmented, less segmentation in the forebrain of the head. Structural segmnetation in the pharyngeal region with gene expression. Formation of forebrain and rostral part of the head (front side of the head) due to signalling by the prechordal mesoderm or anterior visceral endoderm. Connective tissue and skeletal of the rostral part of the head is derived from the neural crest; anterior end of the notochord forms the boundary between chondrocranium and the rostral neural crest-derived chondrocranium. Cephalization begins with the expansion of the rostral end of the neural plate. Future brain is the dominant component of the craniofacial region.
