. Text-book of anatomy and physiology for nurses. Fig. 23.—The Orbit.—(After Morris.) FOSS.^ OF THE SKULL. The four large fossae of the exterior of the skull are the temporal,infratemporal, orbital, and nasal. The temporal fossa (fossa temporalis).—The thinnest partof the skull (Fig. 19). It is bounded by the temporal ridge andthe zygomatic arch, occupied by the temporal muscle, and covered FOSSiE OF THE SKULL. 29 by a strong membrane, called the temporal fascia, through whichthe motion of the muscle may be felt. Infratemporal (or zygomatic) fossa.—At the side of the skullbelow the temporal fo
. Text-book of anatomy and physiology for nurses. Fig. 23.—The Orbit.—(After Morris.) FOSS.^ OF THE SKULL. The four large fossae of the exterior of the skull are the temporal,infratemporal, orbital, and nasal. The temporal fossa (fossa temporalis).—The thinnest partof the skull (Fig. 19). It is bounded by the temporal ridge andthe zygomatic arch, occupied by the temporal muscle, and covered FOSSiE OF THE SKULL. 29 by a strong membrane, called the temporal fascia, through whichthe motion of the muscle may be felt. Infratemporal (or zygomatic) fossa.—At the side of the skullbelow the temporal fossa, from which it is separated by the zygo-matic arch (Fig. 19). It is covered by the ramus of the mandible,and occupied by two of the muscles of viastication, and also by anumber of important arteries, veins, and nerves. Concha superiorSphtnoidxl binus Superior Jmeatus I ^ Inferior meatus — Probe innasal canal. Fig. 24.—Lateral Wall of Nasal Fossa or Cavity.—(Morris.) Orbital fossa (or orbit).—Containing the eye. It is shapedlike a pyramid, the apex being at the back of the fossa. Thelarge opening on the face is bounded by the margins of the orbit,having the frontal bone above, the maxilla below, and the zygo-matic bone on the lateral side. The orbital plate of tlie frontal bone is in the roof of the orbit, and theorbital plate of the maxilla in the Jloor. The lacrimal and ethmoid bones arein the medial wall, the sphenoid and zygomatic bones in the lateral wall. 3° ANATOMY AND PHYSIOLOGY FOR NURSES. The lacrimal canal begins in the lacrimal bone and runs downinto the nose. The optic foramen, for the optic nerve, is at theapex of the fossa. Nasal fossa.—i?oo/formed by nasal and ethmoid hones; Jioorby maxillary and palate bones; lateral wall by nasal, ethmoid,maxillary, and palate bones; septum by ethmoid and vomer (Fig. 24). The openings on the face, or anterior nares, are bounded by
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