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Anterior surface of the coccyx. Labels:5, sacrum; 6, cornu; 7, transverse process; 8, transverse process.

Coccyx, Anterior Surface of the

Anterior surface of the coccyx. Labels:5, sacrum; 6, cornu; 7, transverse process; 8, transverse process.

Posterior surface of the coccyx. Labels: 1, transverse process; 2, transverse process; 3, sacrum; 4, cornu.

Coccyx, Posterior Surface of the

Posterior surface of the coccyx. Labels: 1, transverse process; 2, transverse process; 3, sacrum; 4,…

"The pelvis of the Echidna; sa, sacrum; il, illum; is, ischium; p, pubis; m, marsupial bone." — Chambers, 1881

Echidna Pelvis

"The pelvis of the Echidna; sa, sacrum; il, illum; is, ischium; p, pubis; m, marsupial bone." —…

The sacrum of a young fowl; natural size seen from below.

Fowl Sacrum

The sacrum of a young fowl; natural size seen from below.

The last lumbar vertebra and the sacrum seen from the ventral side.

Lumbar and Sacrum of Spine

The last lumbar vertebra and the sacrum seen from the ventral side.

The last lumbar vertebra and the sacrum seen from the ventral side.

The Last Lumbar Verebra and the Sacrum

The last lumbar vertebra and the sacrum seen from the ventral side.

A bony structure located at the bottom of the spine. The human sacrum forms the back part of the pelvis, is roughly triangular in shape, consists of five united vertebrae, and from its solidity it is well adapted to serve as the keystone of the pelvic arch.

Pelvic Bone, Male

A bony structure located at the bottom of the spine. The human sacrum forms the back part of the pelvis,…

The anterior view of the articulations of the pelvis and hip.

Pelvis

The anterior view of the articulations of the pelvis and hip.

The pelvis. Labels: a, the sacrum; b, the right and the left innominatum.

The Pelvis

The pelvis. Labels: a, the sacrum; b, the right and the left innominatum.

Male pelvis (top) and female pelvis (bottom). The pelvis is stronger and more massively constructed than either the cranial or thoracic cavity. It is composed of 4 bones, the ossa innominata, forming sides and front, and the sacrum and coccyx, completing it behind. The female pelvis differs from that of the male in making it better adapted for giving birth. The most notable differences are that the female pelvis is wider in every direction, giving more room for the child to pass and shallower, which lessens the distance through which the child has to be propelled; and lastly, the bones are thinner and smoother.

Human Pelvis, Male and Female

Male pelvis (top) and female pelvis (bottom). The pelvis is stronger and more massively constructed…

A large, triangular bone at the base of the vertebral column at the upper and back part of the pelvic cavity.

Sacrum

A large, triangular bone at the base of the vertebral column at the upper and back part of the pelvic…

The vertebrae of the sacrum.

The Sacrum

The vertebrae of the sacrum.

Sacrum and coccyx of about seventeen years.

Sacrum and Coccyx

Sacrum and coccyx of about seventeen years.

Ligaments between the sacrum and coccyx.

Ligaments between Sacrum and Coccyx

Ligaments between the sacrum and coccyx.

The sacrum, lateral view.

Lateral View of the Sacrum

The sacrum, lateral view.

Superior and anterior view of young sacrum of about five years.

Superior and Anterior Surface of Sacrum

Superior and anterior view of young sacrum of about five years.

Vertical section of the sacrum.

Vertical Section of the Sacrum

Vertical section of the sacrum.

"The skeleton of the trunk and the limb arches seen from the front. C, clavicle; S, scapula; Oc, innominate bone attached to the side of the sacrum dorsally and meeting its fellow at the pubic symphysis in the ventral median line." —Martin, 1917

Skeletal Trunk

"The skeleton of the trunk and the limb arches seen from the front. C, clavicle; S, scapula; Oc, innominate…

"Fig 56 - Axial skeleton, minus the skull, of an owl, Asio wilsonianus, life size; from nature by Dr. R.W. Shufeldt, USA. at, atlas; ax,axis; cv, cervical vertebrae; c, c', cervical ribs, or free pleurapophyses; dv, dorsal vertebrae, excepting the last one, which joins the sacrum; R, two of the six true ribs (pleurapophyses), whereof sr is sacral; u, one of the five uncinate processes or epipleura; cr, two of the six sternal ribs(haemapophyses), whereof the sixth floats; p, pelvic or sacral region of the spine, comprehending one dorsal, and several lumbar, sacral proper, and urosacral vertebrae; I ilium; Is, ischium; P pubis; a, acetabulum; in, ischio-iliac foremen; o, obturator foramen; clv, caudal or coccygeal vertebrae, whereof py is the pygostyle; s, scapula; ohs, os humero-scapulare; cl, clavicle; C, coracoid; S, sternum." Elliot Coues, 1884

Axial Skeleton

"Fig 56 - Axial skeleton, minus the skull, of an owl, Asio wilsonianus, life size; from nature by Dr.…

Side view of the spinal column, with the vertebrae numbered: C1-7, cervical vertebrae; D1-12, dorsal vertebrae; L1-4, lumbar vertebrae; S1, sacrum; Co1-4, coccyx.

Spinal Column

Side view of the spinal column, with the vertebrae numbered: C1-7, cervical vertebrae; D1-12, dorsal…

Side view of the spinal column. Labels: C 1-7, cervical; D 1-12, dorsal; L 1-15 lumbar; S 1, sacrum; Co 1-4, coccygeal.

Side View of the Spinal Column

Side view of the spinal column. Labels: C 1-7, cervical; D 1-12, dorsal; L 1-15 lumbar; S 1, sacrum;…

Anterior and posterior view of adult spine.

Anterior and Posterior Views of Spine

Anterior and posterior view of adult spine.

Lateral view of adult spine.

Lateral View of Spine

Lateral view of adult spine.

The skeleton of the trunk and the limb arches seen from the front. Labels: c, clavicle; S, scapula; Oc, innominate bone attached to the side of the sacrum dorsally and meeting its fellow at the pubic symphysis in the ventral median line.

Skeleton of Trunk

The skeleton of the trunk and the limb arches seen from the front. Labels: c, clavicle; S, scapula;…

The spinal column, right lateral view and dorsal view.

Lateral and Dorsal View of the Vertebral Column

The spinal column, right lateral view and dorsal view.