Hence in the embryo, there is almost no use for the liver, but the umbilical vein passes directly through, a foramen or an anastomosis existing from the vena portae.
Bony palate short, posterior margin thickened, and with a foramen behind the posterior molar; line of union of the two halves of the lower jaw shorter than in Avahis; its angle very large.
In some species a large maxillary sinus projects into the anterior part of the orbit; in some also the foramen rotundum does not coalesce with the sphenoidal fissure (see page 11), but has a distinct opening.
The foramen for the passage of the spinal-cord, and the condyles for the articulation of the skull with the neck, lie far back.
He recognized the impropriety of the term corpus callosum, seems to have known the communication called afterwards foramen Monroianum, and describes the hippocampus more minutely than had been previously done.
Valve hyaline at the ends, with transverse rows of puncta producing the appearance of costae between the rows; pseudoraphe distinct; foramen single.
Foramen single, alternating above and below in adjoining partitions.
Of cartilage bones four are developed round the foramen magnum--the basioccipital, supraoccipital and two exoccipitals.
In a few cases a parietalforamen occurs (Callichthys, Loricaria, &c.
The mixture of the blood takes place through an opening in the septum separating the two cardiac ventricles, and which corresponds to the foramen ovale of the foetus.
No arterial blood being then any longer brought to the heart through the umbilical vein, the left heart is no longer stimulated, and the foramen ovale collapses and is closed.
The arterial blood transmitted through the umbilical vein is conducted through the foramen ovale into the left ventricle of the heart, and from thence directly to the principal organ of the foetus, the brain and spinal cord.
However, there appears to be a foramen posterior to the incisor, which possibly has taken over the function of the interpremaxillary foramen.
One major foramen opens on each side of the palatomaxillary suture, and two or possibly three smaller foramina open posteriorly on the palatine bone.
Prominent on the palatine bone, posteromedial to the third molar, is the foramen (palatine pit) for the palatine vein.
The infraorbital foramen (anterior opening of the infraorbital canal) lies about midway between the anterior end of the skull and the root of the zygoma.
Anteriorly this orbital process meets the orbital process of the maxillary bone, and the sphenopalatine foramen is found in the suture between these two bones and the frontal.
The sphenofrontal foramen lies in the suture between the extreme anterior margin of this bone and the frontal bone.
Suborbital foramen small, and the palate, as in all the succeeding genera of this group, produced backwards about midway between the last molar and the glenoid fossa.
The origin is fleshy from the posterior wall of the orbit medial to the foramen of the trigeminal nerve and also medial to the origin of M.
The origin is fleshy from the posterior wall of the orbit, dorsal to the foramen of the trigeminal nerve, lateral to the origin of M.
The use of the foramen rotundum, or round hole, before described, is probably the same as that of the hole in the side of a drum; it allows the fluid in the labyrinth to be compressed, otherwise it could not vibrate.
The vertebrae are of the general type of those of Pachyornis, but the anterior pneumatic foramen commences in the third dorsal.
The iliac grooves are larger than in Fulica newtoni, the pelvic knob is more extended, and the sciatic foramen is larger.
The dorsals have short transverse processes and neural spine, the anterior and middle ones (those with a haemal spine or carina) having a large anterior pneumatic foramen between the nib-facet, the foramen being triangular in shape.
There is no intercondylar eminence in the intercondylar channel, and the orifice of the extensor foramenopens more longitudinally than in the other genera, and points downwards.
No foramen between third and fourth trochleae of tarso-metatarsus.
The skull is very short and wide, with a blunt and slightly deflected rostrum, and a very small pneumatic foramen to the quadrate.
In the dorsals there is usually no anterior pneumatic foramen till the fourth (or the last with a distinct haemal carina), this foramen being situated on the line of the anterior border of the rib-facet.
The internal carotid artery also enters the tympanic cavity by a canal which commences in the foramen lacerum posterius, and passes forwards to open on the inner side of the bulla.
It bears a small convex patch of cartilage for articulation with the atlas, and with its fellow forms the boundary of the foramen magnum.
Just external to the foramen magnum is a small foramen for the exit of the hypoglossal nerve (figs.
The foramen rotundum is confluent with the sphenoidal fissure, and the foramen ovale with the foramen lacerum medium and the foramen lacerum posterius.
An ent-epicondylar foramen is found in all living forms.
When followed back the maxillae and quadratojugal diverge further and further from the cranium, till the angle of the mouth comes to be separated from the foramen magnum by a space nearly double the width of the cranium.
A quarter of an inch further back there is another prominent hole, the =foramen ovale= (fig.
The ischium is broad and extends back parallel to the ilium with which in most birds it fuses posteriorly, further forward the ilio-sciatic foramen separates the two bones.
Some distance further to the side, and more dorsally, is a larger foramen which gives passage to the facial nerve and certain blood-vessels.
On the inner side of the dorsal surface of the quadrate near the condyle, is a small foramen which leads into a tube communicating with the tympanic cavity, by a foramen lying in front of and ventral to that for the exit of the facial nerve.
Anteriorly the palatines form the posterior boundary of a large foramen through which the ophthalmic branches of the fifth and seventh nerves pass to the olfactory organs.
The foramen lacerum medium is confluent with the foramen lacerum anterius, and the two together form an enormous vacuity on the floor of the skull, bounded chiefly by the exoccipital, basi-occipital, alisphenoid and squamosal.
An ent-epicondylar foramenis one piercing the humerus on its inner side just above the condyle.
Into the outer and anterior part of the cavity the outer end of the =Eustachian tube= opens; while the inner end passes through a foramen (fig.
In addition, the post-mandibular foramen is absent.
Third unicuspid usually smaller than fourth; upper unicuspids usually with pigmented ridge extending from apices medially to cingula, uninterrupted by antero-posterior groove; post-mandibular foramen usually absent.
Tympanic bulla smaller than foramen magnum; hind foot more than 74; geographic range wholly in United States.
Oreolagus); cutting edge of first upper incisor V-shaped; mentalforamen situated under last lower molar.
Underside of tail white; posterior extension of supraorbital process tapering to a slender point, this point free of braincase or barely touching it and leaving a slit or long foramen Sylvilagus transitionalis, p.
Tympanic bulla as large as foramen magnum; hind foot less than 74; geographic range limited to southern edge of Mexican tableland at high elevations Romerolagus diazi, p.
Galvanization from supra-orbital foramen to nape stopped the pain in five minutes.
In the centre of the interauricular septum of the human heart, an aperture (foramen ovale) is left as being necessary to the foetal circulation.
After birth, on the commencement of respiration, the foramen ovale of the interauricular septum closes, and the ductus arteriosus becomes impervious.
In some of the sharks, and especially the rays, a spiracle or open foramen remains behind the eye.
In Osteolepis, Thursius, Diplopterus, and Glyptopomus a pineal foramen is present on the top of the head.
The hypercoracoid is usually pierced by a round foramen or fenestra, but in some fishes (cods, weavers) the fenestra is between the two bones.
A large incomplete foramen between it and the inferior process.
First cervical with the foramen over the anterior articular facets incomplete, and the borders of the facets less raised.
The anterior foramen of the atlas is incomplete, as in that specimen, and the spines of the conjoined vertebrae are vertical and pointed.
The maxillae are concave around the maxillary foramen, and external to this foramen is an elongated ridge about as in europaeus.
The maxillary foramen is situated a little in advance of the premaxillary foramenand is directed forward, and, as Dr.
Distance of condyles at upper edge of foramenmagnum 100 3.
The occipital condyles do not come in contact beneath the foramen magnum; the symphysis of the lower jaw is very short, amounting to only one-fifth of the whole length of the jaw.
Distance from inner margin of maxillary foramento tip of protuberance much more than one-half the distance between the maxillary foramina of the two sides.
The foramen magnum is very small, being less in width than the condyle on either side of it.
In the median line, however, while the occipital bone is flat immediately above the foramen magnum, it is deeply concave higher up and without a median ridge.
Unlike those species, it has the premaxillary foramen behind the maxillary foramen, and in this respect resembles densirostris and grayi.
The foramenmagnum is large, with a trifoliate outline (Pl.
A comparison of topotypes of pullatus with modestus shows a similar difference in the teeth, modestus being larger, but in the size of the foramen magnum there is no difference.
Mice from the Bitterroot Valley were compared with topotypes of modestus by the "method of pairs," and modestus had a larger foramen magnum in 6 of 6 pairs (Confidence Limit .
In accord with this fact it will be observed that the foramen or hole in the base of the skull through which the spinal cord passes is adjusted closer and closer to the centre of the base of the skull as the spine becomes erect.
In keeping with this law it will be seen in all animals that just in the same degree as the angles widen, the foramen is removed from the centre of the base towards the occiput.
