. Ants; their structure, development and behavior. d, though apparently somewhat in front of the other brainsegments. According to Janet, each antenna is supplied with six nerveswhich arise close together from each olfactory lobe (Fig. 27). These THE INTERNAL STRUCTURE OF ANTS. 53 are: first, the infero-internal sensory nerve (warn), second, the supero-external sensory (nans), third, the chordotonal (to acho), fourth, thenerve to the anterior (adductor) muscles of the scape, fifth, the nerveto the posterior (abductor) muscles of the scape (nsc), and sixth, anerve which supplies the little musc
. Ants; their structure, development and behavior. d, though apparently somewhat in front of the other brainsegments. According to Janet, each antenna is supplied with six nerveswhich arise close together from each olfactory lobe (Fig. 27). These THE INTERNAL STRUCTURE OF ANTS. 53 are: first, the infero-internal sensory nerve (warn), second, the supero-external sensory (nans), third, the chordotonal (to acho), fourth, thenerve to the anterior (adductor) muscles of the scape, fifth, the nerveto the posterior (abductor) muscles of the scape (nsc), and sixth, anerve which supplies the little muscles in the funicular joints (/;/).The tritocerebrum is so much reduced that it is represented only by apair of small bodies, concealed under the olfactory lobes and connectedwith each other by a slender commissure, which, however, passes underthe oesophagus, thus indicating the originally postoral position of thisportion of the brain. Each tritocerebral lobe gives off a nerve whichsoon subdivides into two branches, one (Fig. 27, cnf) going to the. FIG. 27. Sagittal section of head of worker Myrmica rubra. (Janet.) acho,Antennary chordotonal organ ; cnf, connective of frontal ganglion ; art, antennaryarticulation; nans, superior antennary nerve ; iiani, inferior antennary nerve ; nf,funicular nerve ; nsc, nerve to scape ; nlr, labral nerve ; soph, sense-organs of pharynx ;infh, inferior dilator muscle of pharynx ; no, nerves to ocelli ; lies, hypocerebral gang-lion ; mam, adductor muscle of mandible ; Ig, labial sympathetic ganglion ; hi, labialsympathetic nerve; nl, labial nerve; sol, labial sense-organs; , maxillary nerve;11111, mandibular nerve: s, portions of salivary gland; en, connective between sub-oesophageal and prothoracic ganglion ; nial, adductor muscle of labium. Remainingletters as in Fig. 13. frontal ganglion (to be described below in connection with the sympa-thetic nervous system ) the other again subdividing to innervate thelabrum and the wall of the pharyn
Size: 1815px × 1376px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectants, bookyear1910
