a. 背的, 背部的, 背侧的

[医] 背的, 背侧的

Dorsal \Dor"sal\, a. [F. dorsal, LL. dorsalis, fr. L. dorsualis,
fr. dorsum back; cf. Gr. ?, ?, mountain ridge. Cf. {Dorse},
{Dorsel}, {Dosel}.]
1. (Anat.) Pertaining to, or situated near, the back, or
dorsum, of an animal or of one of its parts; notal;
tergal; neural; as, the dorsal fin of a fish; the dorsal
artery of the tongue; -- opposed to {ventral}.

2. (Bot.)
(a) Pertaining to the surface naturally inferior, as of a
leaf.
(b) Pertaining to the surface naturally superior, as of a
creeping hepatic moss.

{Dorsal vessel} (Zo["o]l.), a central pulsating blood vessel
along the back of insects, acting as a heart.


Dorsal \Dor"sal\, n. [LL. dorsale, neut. fr. dorsalis. See
{Dorsal}, a.] (Fine Arts)
A hanging, usually of rich stuff, at the back of a throne, or
of an altar, or in any similar position.

Posterior \Pos*te"ri*or\ (p[o^]s*t[=e]"r[i^]*[~e]r), a. [L.
posterior, compar. of posterus coming after, from post after.
See {Post-}.]
1. Later in time; hence, later in the order of proceeding or
moving; coming after; -- opposed to {prior}.

Hesiod was posterior to Homer. --Broome.

2. Situated behind; hinder; -- opposed to {anterior}.

3. (Anat.) At or toward the caudal extremity; caudal; -- in
human anatomy often used for {dorsal}.

4. (Bot.) On the side next the axis of inflorescence; -- said
of an axillary flower. --Gray.


Neural \Neu"ral\, a. [Gr. ney^ron nerve.] (Anat. & Zo["o]l.)
relating to the nerves or nervous system; taining to,
situated in the region of, or on the side with, the neural,
or cerebro-spinal, axis; -- opposed to {hemal}. As applied to
vertebrates, neural is the same as {dorsal}; as applied to
invertebrates it is usually the same as ventral. Cf. {Hemal}.

{Neural arch} (Anat.), the cartilaginous or bony arch on the
dorsal side of the centrum of the vertebra in a segment of
the spinal skeleton, usually inclosing a segment of the
spinal cord.