| 释义 |
digastric, a. and n. Anat.|daɪˈgæstrɪk|
[ad. mod.L. digastric-us, f. Gr. δι-, di-2 + γαστήρ, γαστρ- belly: cf. gastric. In F. digastrique ‘hauing two bellies’ Cotgr. 1611.]
A. adj.
1. Having two parts swelling like bellies; spec. applied to muscles having two fleshy bellies with an intervening tendinous part, as that of the lower jaw; see B.
1721Bailey, Digastric, that has a double belly. 1732Monro Anat. Bones 102 Where the digastric Muscle of the lower Jaw has its Origin. 1872Huxley Phys. vii. 175 There are muscles which are fleshy at each end and have a tendon in the middle. Such muscles are called digastric or two-bellied.
2. Of or pertaining to the digastric muscle of the lower jaw: see B.
1831R. Knox Cloquet's Anat. 53 On the inside of, and behind, the mastoid process, is a longitudinal depression named the Digastric Groove, on account of its giving attachment to the muscle of that name. 1840J. Ellis Anat. 82 The digastric nerve, the largest of the three branches of the portio dura..is distributed by many filaments to the under surface of the posterior belly of the digastric. 1842E. Wilson Anat. Vade M. (ed. 2) 49 Upon the inner side of the root of the mastoid process is the digastric fossa.
B. n. (Also in L. form digastricus.) A muscle of the lower jaw, thick and fleshy at its extremities, thin and tendinous at its middle.
It arises from the back part of the skull, and is inserted into the mandible. Its action is to depress the lower jaw, or to raise the hyoid bone and carry it backwards or forwards as in deglutition. (Syd. Soc. Lex.)
1696Phillips, Digastric, a double-bellied Muscle, which..ending in..the Chin, draws it downward. 1746J. Parsons Hum. Physiognomy i. 30 It serves..to assist the Digastric in opening the Jaws. 1872Mivart Elem. Anat. 286 The digastric is a muscle with two fleshy bellies, with a median tendon. 1881Athenæum 9 Apr. 496/1 On the Tendinous Intersection of the Digastric. |