. Journal of anatomy . ooved by either itor the middle meningeal artery. At the inner side of its lower end thisala temporalis is hollowed out to fit on the outer end of the processusalaris. The upper end of the ala temporalis is covered in great part bythe enormous Gasserian ganglion, and being small it can contribute butvery little to the basis cranii (fig. 2). The ala orbitalis (lesser wing) is of relatively enormous size as comparedwith the ala temporalis ; at its inner extremity it presents to view two limbs, Reconstruction of the Head of a Thirty-Millimetre Embryo 305 of which the more p
. Journal of anatomy . ooved by either itor the middle meningeal artery. At the inner side of its lower end thisala temporalis is hollowed out to fit on the outer end of the processusalaris. The upper end of the ala temporalis is covered in great part bythe enormous Gasserian ganglion, and being small it can contribute butvery little to the basis cranii (fig. 2). The ala orbitalis (lesser wing) is of relatively enormous size as comparedwith the ala temporalis ; at its inner extremity it presents to view two limbs, Reconstruction of the Head of a Thirty-Millimetre Embryo 305 of which the more posterior runs inwards to fuse with the corpus sphenoi-dale and complete behind the foramen opticum (fig. 2). The anterior limb,although well developed, has not as yet fused with the corpus sphenoidale;at its outer end the ala orbitalis forms a long tapering point, which, pro-jecting beyond the outer wall of the orbit, ends in the temporal fossa makingtowards but not reaching that plate of cartilage, which will be later. Fig. 2.—View from above of the interior of the base of the neuro-cranium of theBiyce 30-nim. embryo. The cartilage is everywhere stippled and crossesare placed on the ethmoidal plate. , ala teniiwralis or pars zygomatica of great wing ; , corpus sphenoidale ; ,dorsum sell* ; , ethmoidal plate, continuous in front with nasal capsule () andbehind with ala orliitalis (); the fissure at the inner side of the junction of alaorbitalis and ethniuidal plate is the spheno-ethraoidal fissure; F., frontal bone ; ,parietal plate ; V., vacuity owing to large blood-vessel or perhaps extravasation. described as the parietal plate of Spondli, and so forming the anteriormoiety of what is in many mammals, <\(j. Echidna, Talpa, Erinaceus, Tatusia,Dasypus, Sus, Bos, and Ovis (Gaupp), the commissura orbito-parietalis. Inits outer half the anterior border of the orbital wing is prolonged into aflat plate of cartilage which passes inwards to the nasal
Size: 1612px × 1550px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
