Somatosensory system (Wiki) http://en.wikipedia.org/wiki/Somatosensory_system This article on the human sensation of touch is provided for reference. New perspectives on the evolution of protochordate... (Goog) abstract: http://www.ncbi.nlm.nih.gov/pubmed/11604123 full length PDF: http://rstb.royalsocietypublishing.org/content/356/1414/1565.full.pdf p. 6 "Except for surface mechanoreceptors, which make the amphioxus quite sensitive to touch..." Basic features of the ancestral chordate brain ... (Goog) http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6SYT-4R5P42V-3&_user=10&_coverDate=03%2F18%2F2008&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1203822543&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=3a45115b7eacd47a7e14a2d87d40ba3d "Amphioxus has direct pathways for activating its locomotory circuits in response to mechanical stimuli via epithelial sensory cells" Lacalli: 2002 A reexamination of the epithelial sensory cells of amphioxus (Branchiostoma) http://www3.interscience.wiley.com/journal/119055286/abstract?CRETRY=1&SRETRY=0 Link to abstract only, but I have PDF & hard copy. |