The Pelvis: Anatomy

Front 1

Iliac Crest:

Back 1

extends from ASIS to PSIS

S shape from superior view can be divided into:
1. Anterior 2/3 (a.k.a. lateral iliac crest).. has an inner and an outer lip with intermediate area in between.

2. Posterior 1/3 (a.k.a. the medial iliac crest)... has medial and lateral sloping surfaces

Front 2

Iliac Tubercle:

Back 2

2 inches posterior to the ASIS

Front 3

Pubic Crest:

Back 3

ends laterally in the pubic tubercle

Front 4

Conjoined (ischiopubic) Ramus:

Back 4

formed by the fusion of the inferior pubic ramus and the ischial ramus

the perineal membrane stretched between the two conjoined rami

the crura of the clitoris/penis are attached also to the perineal surface (a crus on each side) just under the perineal membrane.

Front 5

iliopubic eminence:

Back 5

marks the union of ilium and pubis
located on the pelvic brim
medial to it are the structures running the femoral sheath
lateral to it are the converging fibers of the iliopsoas muscle

Front 6

Ischial Spine

Back 6

*the most important anatomical feature in the true pelvis

attachment of levator ani (posterior end of tendinous arch)

attachment of sacrospinous ligament, and ischiococcygeus muscle

Front 7

Inguinal Ligament (origin and insertion)

Back 7

from the ASIS to the pubic tubercle

Front 8

What muscles attach to the:
1. outer lip
2. intermediate area
3. inner lip
of the anterior 2/3 of the iliac crest

Back 8

1. outer lip: external oblique and latissiumus dorsi

2. intermediate area: internal oblique

3. inner lip: transversus abdominus and quadratus lumborum

Front 9

promontory of the sacrum:

Back 9

the anterior margin of the sacrum that protrudes like a lip.. it is part of the pelvic brim

Front 10

How do we prevent spondylolisthesis?

Back 10

the base of the sacrum has two articular processes facing backwards articulating with the inferior articular processes of L5 (facing forwards)... this is a synovial joint.

Front 11

Pelvic Brim equation:

Back 11

Pelvic Brim = promontory of sacrum + 2 arcuate lines meeting at the symphysis pubis (interrupted by the sacroiliac joints, and the iliopubic eminence)