anal pit


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pit

 [pit]
1. a hollow fovea or indentation.
2. a pockmark.
3. to indent, or to become and remain for a few minutes indented, by pressure.
anal pit proctodeum.
auditory pit a distinct depression in each auditory placode, marking the beginning of the embryonic development of the internal ear.
lens pit a pitlike depression in the fetal head where the lens develops.
nasal pit (olfactory pit) a depression appearing in the olfactory placodes in the early stages of development of the nose.
pit of stomach the epigastric fossa or epigastric region.

a·nal pit

an ectodermally lined depression under the caudal eminence to the terminal part of the embryonic hindgut; at its bottom there is an epithelial plug. When this epithelial plug ruptures, the anal orifice is established.
Synonym(s): proctodeum (2)

a·nal pit

(ā'năl pit)
1. An ectodermally lined depression under the taillike caudal eminence adjacent to the terminal part of the embryonic hindgut; at its bottom, proctodeal ectoderm and cloacal endoderm form the cloacal plate. When this epithelial plate ruptures, the anal and urogenital external orifices are established.
Synonym(s): proctodeum.
2. Terminal portion of the insect alimentary canal.

pit

(pit)
1. A tiny hollow or pocket. Synonym: depression; fossa
2. To be or become marked with a shallow depression; to cause a depression on pressure in edema.
3. A small depression in the enamel surface of a tooth often connected with one or more developmental grooves. It contributes to pit and fissure caries. Synonym: occlusal pit

anal pit

Proctodeum.

auditory pit

A pit that develops in the auditory placode.

costal pit

The inferior facet on the body of a thoracic vertebra. It articulates with the head of a rib.
Enlarge picture
GASTRIC PIT

gastric pit

Any of many foveolae in the gastric mucosa into which the gastric glands open. See: illustration

lens pit

The depression on the skin of the embryonic head where the lens of the eye will develop.

nasal pit

In the embryo, one of two horseshoe-shaped depressions on the ventrolateral surface of the head bounded by lateral and median nasal processes. It gives rise to nostrils and a portion of the nasal fossa.
Synonym: olfactory pit

occlusal pit

Pit (3).

olfactory pit

Nasal pit.

optic pit

A small indentation of the optic nerve head. It may sometimes release fluid below the retina, which can cause central retinal detachment.

primitive pit

A minute depression at the anterior end of the primitive groove or streak and immediately posterior to the primitive knot.

pit of the stomach

1. Colloquial term for the depression at the end of the xiphoid process.
2. Colloquial term for the center of the abdominal region above the navel.

pit

1. a hollow fovea or indentation.
2. a pockmark.
3. to indent, or to become and remain for a few minutes indented, by pressure.
4. seed of a fruit, e.g. cherry. Strictly refers to the hard woody coating which surrounds the seed.

anal pit
the proctodeum of the embryo.
auditory pit
a distinct depression in each auditory placode, marking the beginning of the embryonic development of the internal ear.
pit bull
a term used in describing various types of dogs used in past times for fighting in pits. Now, usually refers to the specific breed, american pit bull terrier.
lens pit
a pitlike depression in the fetal head where the lens develops.
nasal pit
a depression appearing in the olfactory placodes in the early stages of development of the nose. Called also olfactory pit.
olfactory pit
see nasal pit (above).
otic pit
early stage in the development of the embryonic inner ear.
pit pony
pony used in a mine to haul mined rock. Breed varies as long as it is small, e.g. Shetland pony.
pit of stomach
the epigastric fossa or epigastric region.
pit viper
see viper.