. On the anatomy of vertebrates [electronic resource] . Mammary cleft, dilated, exhibiting the nippleand its orifices, Porpoise, cclxxxhi. Position of mammary clefts, Porpoise. CCLXXXHI. The lateral portions of the cleft are composed of parts looser intexture than the common skin, which is probably to admit of theelongation or projection of the nipple. On the outside of thisthere is another small fissure, which gives greater facility to themovements of all these parts. The nipple itself, shown by dilating the mammary fossa infig. 607, is perforated by numerous lacteal ducts. Hunter thusalludes
. On the anatomy of vertebrates [electronic resource] . Mammary cleft, dilated, exhibiting the nippleand its orifices, Porpoise, cclxxxhi. Position of mammary clefts, Porpoise. CCLXXXHI. The lateral portions of the cleft are composed of parts looser intexture than the common skin, which is probably to admit of theelongation or projection of the nipple. On the outside of thisthere is another small fissure, which gives greater facility to themovements of all these parts. The nipple itself, shown by dilating the mammary fossa infig. 607, is perforated by numerous lacteal ducts. Hunter thusalludes to the unusual circumstances under which the act of 1 xciv. p. 392. 778 ANATOMY OF VERTEBRATES. sucking must be performed in the present aquatic mammals : —i As either the mother or young one will be prevented frombreathing at the time, their nostrils being in opposite directions,therefore the. nose of one must be under water, and the time ofsucking can only be between each respiration. The considerablelacteal reservoir, and the quality of milk it
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