Mother, Nurse and Infant / A Manual Especially Adapted for the Guidance of Mothers and Monthly Nurses, Comprising Full Instruction in Regard To Pregnancy, Preparation for Child-birth, and the Care of Mother and Child, and Designed to Impart so Much Knowledge of Anatomy, Physiology, Midwifery, and the Proper Use of Medicines as Will Serve Intelligently to Direct the Wife, Mother and Nurse in All Emergencies.

by S. P. Sackett

Fig. 2. Right os innominatum, external surface.
Fig. 2—Represents the external surface of the right os innominatum. A. The external iliac fossa; B, crest of the ilium; C, anterior superior spine of the ilium; D, anterior inferior spine of the ilium; E, horizontal branch of the pubis; F, posterior superior spine of the ilium; G, posterior inferior spine of the ilium; H, acetabulum; I, ischium; K, obturator foramen. At birth the haunch bone, or os innominata, is composed of three bones connected by cartilage. Fig. [3].

The superior portion of the bone is characterized on its abdominal or internal face by a large excavation called the internal iliac fossa (Fig. [4].) This portion is terminated below by a large rounded and concave line. The inferior (lower) portion presents behind a nearly triangular plane surface; near the middle of this is the obturator foramen, and in front is the internal face of the os pubis.

Fig. 3. Left os innominatum, external surface, etc.
Fig. 3—Left os innominatum, partly ossified. The haunch bone as it exists in the child. A, pubis; B, ilium; C, ischium.

Fig. 4. Right os innominatum, internal surface.
Fig. 4—Right os innominatum, internal surface. A, internal iliac fossa; B, anterior superior spinous process of the ilium; C, crest of the ilium; D, posterior superior spinous process of the ilium; E, posterior inferior spinous process of the ilium; F, articular surface; G, spine of the ischium; H, tuberosity of the ischium; I, obturator foramen; K, ischia pubic ramus; L, crest of the pubis; M, the pectineal eminence.

THE OS COCCYGIS.

Fig. 5.
The os coccygis.

The OS COCCYGIS (Fig. [5]) is three or four little bones united together on the median line of the body, and attached to the os sacrum. Each little bone is tipped with cartilage, and they are so united as to be movable. The entire bones form a pyramid, the apex of which is below. The internal surface is smooth, like that of the sacrum, terminating the plane of the sacrum and bounding it anteriorly.