. Anatomy, descriptive and applied. Anatomy. 84 SPECIAL ANAT03IY OF THE SKELETON sphenoid and occipital bones. Its direction from without is inward, forward, and a little downward. It presents for examination an apex, four surfaces, and four borders, and contains in its interior the essential parts of the organ of hearing. Apex {apex pyramidis).—The apex of the petrous portion, rough and uneven, is recei^'ed into the angular interval between the posterior border of the greater wing of the sphenoid and the basilar process of the occipital; it presents the ante- rior or internal orifice of the c
. Anatomy, descriptive and applied. Anatomy. 84 SPECIAL ANAT03IY OF THE SKELETON sphenoid and occipital bones. Its direction from without is inward, forward, and a little downward. It presents for examination an apex, four surfaces, and four borders, and contains in its interior the essential parts of the organ of hearing. Apex {apex pyramidis).—The apex of the petrous portion, rough and uneven, is recei^'ed into the angular interval between the posterior border of the greater wing of the sphenoid and the basilar process of the occipital; it presents the ante- rior or internal orifice of the carotid canal (foramen caroticum internum), and forms the posterior and external boundary of the foramen lacerum medium. Surfaces.—The superior surface of the petrous portion (Fig. 48) forms the posterior part of the middle fossa of the skull; it looks upward and forward. This surface is continuous with the squamous portion, to which it is united by. PANIC CANfl Fig. 50.—Right temporal bone cut open to show the anterior surface of the petrous portion. X 2. (Spalteholz.) a suture, the petrosquamous suture, the remains of which are distinct even at a late period of life. The superior surface presents five points for examination: (1) An eminence (eminentia arcuata) near the centre, which indicates the situation of the superior semicircular canal. (2) In front and a little to the outer side of this eminence a depression indicating the position of the tympanum; here the layer of bone which separates the tympanum from the cranial cavity is extremely thin, and is known as the tegmen tympani. The tliin inferior extremity of this plate drops downward and presents itself at the inner extremity of the Glaserian fissure, there making the fissure double; the anterior slit is called the canal of Huguier, and it transmits the chorda tympani nerve. (3) A shallow groove, sometimes double, leading outward and backward to an oblique opening, the hiatus Fallopii (liiatus caualis facialis), fo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
