Sacrum, Chapter 8

auricular surface

a large articular process for articulation with similarly shaped processes on the iliac bones of the pelvis

superior articular proceses

articulate with the inferior articular processes of the last lumbar vertebra to form the last pair of zygapophyseal joints

sacral promontory

at its superior margin, the base of the sacrum has a prominent ridge termed the

auricular surface

at the superoanterior part of the lateral surface of each ala is the

obliquely, superiorly, anteriorly

broad base is projected ____ _____ and _____

sacral canal

directly behind the bodies of the sacral segments is the

pelvic-sacral foramina

each of the anterior and posterior walls of the sacral canal is perforated by four parts of _____ ____ ____ for passage of the sacral nerves and blood vessels

females, oblique, sharper

greater curvature is in the lower half of the bone in _____, it also lies at a more _____ plane, resulting in a -___ angle at the juncion of the lumbar and pelvic curves

sacrum

is formed by fusion of the 5 sacral vertebral segments into a curved triangular bone

ala

on each part of the sacral base is a large winglike lateral mass called the

female

the ____ sacrum is more acutely curved

superior, lumbar

the _____ portion of the 1st sacral segment remains distinct and resembles the vertebrae of the ____ region

posteriorly, inferiorly

the apex is directed _____ and _____

males, females

the bone is normally longer, narrower, more evenly curved, and more vertical in position in ________ than ______

intervertebral foramina

the concavities of the upper surface of the pedicles of the 1st sacral segment and the corresponding concavities on the lower surface of the pedicles of the last lumbar segment form the last pair of:

apex, sacral cornua

the inferior surface of the _______ of the sacrum has an oval facet for articulation with the coccyx and _____ _____

coccygeal cornua

the sacral cornua are two processes that project inferiorly from the posterolateral aspect of the last sacral segment to join the

illiac bones

the sacrum is wedged between the _____ ______ of the pelvis

base, lumbosacral

the superior surface of the ______ of the sacrum corresponds in size and shape to the inferior surface of the last lumbar segment, with which it articulates to form the _________ junction