Fig. 2.
The External Convext Surface of the Os Innominatum:
A B B, Its Cavity, wherein the Head of the Os Femoris is receiv'd, call'd Acetabulum and Pixis.
A, A Sinus Excavated in the Inferior Part of the Acetabulum, in which the Mucilaginous Gland is plac'd: Vid. Tab. 74.1.
The Ligamentum Rotundum Figur'd Tab. 74. k, Arises from the Lower-part of the Acetabulum to∣wards its External Margin; whence it passes Upwards to its Termination in the Head of the Os Femo∣ris; which Disposition of that Ligament, is no small Artifice in Nature, in preventing too great a Coa∣lision of the Superior Part of the Acetabulum with the Head of the Thigh-bone, in Walking, Run∣ning, &c. as before Noted.
B B, The External Margin of the Acetabulum, whence the Ligamentum Latum do's Arise; which Ligament is Implanted in the Neck of the Os Femoris.
C D E, The Dorsum Ilii.
D Superior, The Spina Ilii.
E E, Divers Processes towards the Back-part of the Ilium, where its other Side, Exprest in the Former Figure D, is join'd with the Sacrum.
F, A Sinus of the Os Ilium, in which the Musculus Pyriformis passes towards its Implantation.
G, An Acute Process of the Ischium.
H, An Appendix of the Ischium, to which a Ligament Arising from the Os Sacrum is Fasten'd: From this Appendix the Musculus Quadratus Femoris, and the Muscles Bending the Tibia, do Arise.
I, That Part where the Os Ischium joins with the Os Pubis.
K, The Os Pubis or Pectinis.
L, The Great Foramen of the Ischium and Pubis.
N. B. The Three Bones which Compose the Os Innominatum, all meet and join in the Acetabulum.