. Animal physiology. Physiology, Comparative; Physiology, Comparative. 458 BONES OF THE FACE. sphenoid (see Fig. 189). The surface of the mucous membrane which lines it, and on which its nerves are distributed (§. 506), is also extended, by being carried over a set of bones, termed spongy bones, which hang, as it were, from the side walls of the cavity. 623. It is in the superior maxillary bone, that all the teeth of the upper jaw are implanted in Man; but in the infant, this bone is composed of several pieces; and one of these pieces, termed the inter- maxillary'bone, (im, * Fig. 211,) re
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 458 BONES OF THE FACE. sphenoid (see Fig. 189). The surface of the mucous membrane which lines it, and on which its nerves are distributed (§. 506), is also extended, by being carried over a set of bones, termed spongy bones, which hang, as it were, from the side walls of the cavity. 623. It is in the superior maxillary bone, that all the teeth of the upper jaw are implanted in Man; but in the infant, this bone is composed of several pieces; and one of these pieces, termed the inter- maxillary'bone, (im, * Fig. 211,) remains permanently sepa- rate in most of the mi mo c lower animals. The Fig. 211.—Skull of Horse; oc, occipital bone; t, tern- ]ower iaw 0f adult poral; /, frontal; n, nasal; m, superior maxillary ; im, J intermaxillary; mi, inferior maxillary; o, orbit; i, incisor Man, also, is COttl- teeth; c, canines; mo, molars. i i j. /« • i posed but ot a single piece; 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 with its extremities turned up considerably. It is articulated with the temporal bones by a condyle or projecting head, with which each of these extremities is furnished; and this head is received into what is termed the glenoid* cavity on the under side of the temporal bone. In front of the condyle is another projection, or process, termed the coronoid, (a, Fig. 104,) wThich serves for the attachment of one of the principal muscles that raise the Jaw. These muscles are all attached near the angle of the jaw (or the point at which it bends upwards), and they consequently act at a small distance from its fulcrum, whilst the resistance is applied at the furthest point (§. 189). We are * The term condyle is applied to most of the projecting surfaces of articulation, in different parts of the body ; and the term glenoid to the cavities into
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