. Animal physiology. Physiology, Comparative. BONES OF THE FACE. 4G7 as the back of the mouth, and coniiiimiicates with the pharynx by two apertures termed the posterior nares (tig. 200, c). Tlie partition between the fossae is formed at the upper part by a plate that projects downwards from tlie etli- moid bone, and at the lower by a distinct bone called the vo7ner (or ploughshare) from its pecidiar form ; to the front edge of this last is attached a cartilage, which continues the partition forwards into the soft projecting portion of the nose. It is through the thin horizontal plate of the e
. Animal physiology. Physiology, Comparative. BONES OF THE FACE. 4G7 as the back of the mouth, and coniiiimiicates with the pharynx by two apertures termed the posterior nares (tig. 200, c). Tlie partition between the fossae is formed at the upper part by a plate that projects downwards from tlie etli- moid bone, and at the lower by a distinct bone called the vo7ner (or ploughshare) from its pecidiar form ; to the front edge of this last is attached a cartilage, which continues the partition forwards into the soft projecting portion of the nose. It is through the thin horizontal plate of the ethmoid bone, which separates the nasal cavity from that of the skull, that the olfactory nerves make their way out from the former into the latter : they descend in immerous branches, for the passage of which through the roof of the nose this plate is perforated by a number of small apertures, which give it a sieve-like aspect; whence it is called the cribriform'^ plate of the ethmoid. 623. It is in the superior maxillary bone that all the teeth of the upper jaw are implanted in Man; but in the embryo this bone is composed of several pieces; and one of these pieces, termed the intermaxillary bone (m, fig. 221), remains. Fig. 221.—Skull of Horse. OC, occipital bone; t, temporal; /, frontal; 7i, nasal; m, superior maxillary; im, intermaxillary; jnf, inferior maxillary; o, orbit; e", incisor teeth; c, canines; mo, molars. permanently separate in most of the lower animals. The lower jaw of adult Man, also, is composed but of a single j)iece ; though this is divided in the infant on the central line, and the two halves remain separate in many of the lower animals. This bone has a general resemblance in form to a horse-shoe vdi\\ its extremities turned up considerably; it is ^ From the Latin, crihrum, a sieve. H H 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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Keywords: ., bookauthorcarpente, bookcentury1800, bookdecade1850, bookyear1859
