| 释义 |
‖ gubernaculum|gjuːbəˈnækjʊləm|
Pl. gubernacula.
[L. gubernāculum, f. gubernāre to steer, rule, govern.]
Applied to several animal and vegetable structures which are used for steering (e.g. in flight), or for regulating the (embryonic) development or course of an organ. †a. ? The elytron of a coleopterous insect. b. Anat. In the male human fœtus, a fibrous cord connecting the testis with the scrotum and drawing it down as the fœtus grows. c. Odontology. ‘The solid pedicle of fibrous tissue which connects the dental sac of the permanent teeth with the gum in the early stage of their development’ (Syd. Soc. Lex. 1886) d. Zool. (See quot. 1871.) Also, ‘the posterior trailing flagellum of a biflagellate infusorian, used for steering’ (Cent. Dict.).
a.1661Lovell Hist. Anim. & Min. Introd., Locusts make a noise by rubbing themselves with their gubernacula.
b.1786Hunter Observ. Anim. Œcon. Wks. 1837 IV. 7 A substance..which at present I shall call the ligament, or gubernaculum testis, because it connects the testis with the scrotum, and seems to direct its course through the rings of the abdominal muscles. 1842E. Wilson Anat. Vade M. (ed. 2) 573 The Gubernaculum is a soft and conical cord.
c.1841tr. Cruveilhier's Descr. Anat. II. 241 The influence exerted by the iter dentis and gubernaculum upon the direction of the permanent teeth is by no means constant. 1876C. S. Tomes Dental Anat. 135 The gubernacula of the front permanent tooth sacs.
d.1871Allman Gymnoblastic Hydroids p. xvi, Gubernaculum.., a common sack-like membrane which surrounds the generative buds within the gonangium, and aids in directing them or their contents towards the orifice of the gonangium. 1880–81W. Saville-Kent Man. Infusoria I. 434 [In Anisonema] The posterior flagellum, or gubernaculum, trailing in the rear.
Hence guberˈnacular a., of or pertaining to a gubernaculum.
1871Allman Gymnoblastic Hydroids 51 Gonophores in various stages of development, all surrounded by the gubernacular membrane. 1882Quain's Elem. Anat. II. 908 There is likewise a fibrous structure attached inferiorly to the lower part of the scrotum, and surrounding the peritoneal pouch above, which may be distinguished as the gubernacular cord. 1886Syd. Soc. Lex., Gubernacular sac. |