external occipital crest

(redirected from crista occipitalis externa)

ex·ter·nal oc·cip·i·tal crest

[TA]
a ridge extending from the external occipital protuberance to the border of the foramen magnum.

external occipital crest

a ridge extending downward from the external occipital protuberance.

ex·ter·nal oc·cip·i·tal crest

(eks-tĕr'năl ok-sip'i-tăl krest) [TA]
A ridge extending from the external occipital protuberance to the border of the foramen magnum.

crest

1. a projecting structure or ridge, especially one surmounting a bone or its border.
2. a term describing the upper margin of the neck; root of the mane in a horse.
3. in canaries, a crown of long feathers on the head, all radiating out from a central point; inherited as a dominant trait.

ampullary crest
linear thickenings of the walls of the ampullae of the semicircular canals.
dental crest
the maxillary ridge passing along the alveolar processes of the fetal maxillary bones.
epicondylar crest
ridges which extend from the epicondyles of the humerus to the shaft.
ethmoid crest
located on the inside surface of the nasal bones of the pig and dog.
external occipital crest
an extension of the external occipital protuberance to which the ligamentum nuchae is attached.
facial crest
the prominent crest on the external aspect of the maxilla of horses stretching from beneath the orbit to the middle of the molar teeth. The masseter muscle is attached to its ventral surface.
crest hair
see mane.
iliac crest
the thickened cranial border of the ilium of dogs and cats.
neck crest
the fatty, fibrous tissue above the nuchal ligament which gives the stallion's neck its characteristic elevated contour.
neural crest
cords of nervous tissue which detaches from the developing spinal cord in the embryo; contribute tissue to the somatic and autonomic ganglia, and many other structures.
nuchal crest
the thick, transverse crest on the occipital bone.
palatine crest
a low transverse ridge on the palatine bones.
petrosal crest
divides the cranial cavity into cerebellar and cerebral compartments.
renal crest
the median ridge in the pelvis of many kidneys onto which papillary ducts open.
reticular c's
the mucosal folds in the ruminant reticulum that form the cells of the honeycomb compartments of the walls.
sacral c's
the median crest is the fused dorsal spines of the sacral vertebrae; the lateral sacral crest is the fused articular processes.
sagittal crest
the ridge in the middle of the skull which extends forwards from the occipital protuberance; more pronounced in some species, breeds and individuals.
trochanteric crest
a ridge which runs between the greater and lesser trochanters and forms the caudal wall of the trochanteric fossa.
urethral crest
a longitudinal ridge in the roof of the pelvic urethra formed from two folds of urinary bladder mucosa which fuse after separate origins at the ureteric orifices.
vestibular crest
divides the vestibule of the inner ear into the spherical and elliptical recesses.
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