Download MBBS Ileum Lecture PPT

Download MBBS (Bachelor of Medicine and Bachelor of Surgery) Latest Ileum Lecture PPT


OBJECTIVES:
General overview of hip bone.
Side determination and anatomical position.
Ilium bone
1.Two ends: upper & lower ends.
2.Three borders: Anterior, posterior & medial

borders.

3.Three surfaces: Gluteal surface, iliac fossa,

sacropelvic surface.


HIP BONE/ OS COXAE/ INNOMINATE BONE

Large , irregular bone.
Two hip bones along with sacrum & coccyx forms

the bony pelvis.

Parts: a) Ilium
b) Ischium
c) Pubis


SIDE DETERMINATION & ANTOMICAL

POSITION:
Ilium is expanded and projects upwards.
Pubis faces forwards and medially above the

obturator foramen.

Acetabular cavity faces forwards, downwards

and laterally.

ASIS and pubic crest lie in the same vertical

level.



ILIUM
ILIUM
Ilium is the flat, expanded portion

above the acetabular cavity.

It has:
a)2 ends: Upper and Lower
b)3 borders: Anterior, Posterior & Medial
c)3 surfaces: Gluteal surface, Iliac fossa
& sacropelvic surface
ENDS:
I. UPPER END/ ILIAC CREST:
o Expanded and elongated.
o ASIS: Projected anterior end of the iliac crest.
Attachments: i) Lateral end of inguinal ligament.
ii) Sartorius arises below the
inguinal ligament.
o PSIS: Projected posterior end of the iliac crest.
o Highest point of the iliac crest lies at the level of 3rd and 4th

lumbar spine.

o Iliac crest is divided into: Ventral 2/3 segment.
Dorsal 1/3 segment.


A) VENTRAL 2/3 SEGMENT:

Possesses:
1) OUTER LIP
?

Has a tubercle 5 Cm above

and behind the ASIS called

the tubercle of iliac crest.

?

Attachments:

I.

Tensor fascia lata: originates

in front of the tubercle of

iliac crest.

II.

External oblique muscle:

inserted into anterior 2/3 of

outer lip.

III. Latissimus dorsi: originates

just behind its highest point.



2. INNER LIP:
Attachments:
I. Transversus abdominis:

anterior 2/3

II. Quadratus lumborum and

lumber fascia: posterior

1/3

3. INTERMEDIATE AREA
? Lies between outer and

inner lips. Internal oblique

muscle arises from it.
DORSAL 1/3 SEGMENT:
? Ends behind in PSIS.
? Possesses 2 sloping surfaces: outer and inner

separated by a well marked ridge.

? Attachments:
1.Glutus Maximus: from outer sloping surface.
2.Erector spinae: from inner sloping.
3.Interosseous & dorsal sacroiliac ligament:

attached to the medial margin.




II. LOWER END:

Smaller and forms about 2/5th of articular surface of acetabulum.


BORDERS:
3 borders:
1.Anterior

border

2.Posterior

border

3.Medial

border
A) ANTERIOR BORDER:

? Extends from ASIS to acetabulum.
? Has a small notch below the spine, which gives exit to

the lateral cutaneous nerve of thigh.

? ANTERIOR INFERIOR ILIAC SPINE: projection in the

lower part of this border.

? Attachments:
1. Straight head of rectus femoris: to upper and anterior

part

2. Iliofemoral ligament: to lower part
B) POSTERIOR BORDER:
Runs downward from PSIS to become

continuous with posterior border of

ischium. At its lower part it forms the

upper part of greater sciatic notch.

Has a small notch in its upper part at the

lower end of which is a projection called

the PIIS.

C) MEDIAL BORDER:
Separates the iliac fossa from sacropelvic surface.
Its lower part which is smooth and rounded is

known as arcuate line. It extends to the iliopubic

eminence which is an elevation at the place where

ilium and pubis unite.

Attachments:
1.Psoas minor: inserted to the middle of arcuate line.
2.Ventral sacroiliac ligament.
SURFACES:

3 Surfaces: 1. gluteal surface
2. iliac fossa
3. sacropelvic surface
SURFACES:
A) GLUTEAL SURFACE:
? Boundaries:
v Above by the iliac crest.
v Below by upper border of acetabulum.
v In front by anterior border.
v Posteriorly by posterior border.
? Divided by three lines into four areas:
1. Posterior gluteal line
2. Anterior gluteal line
3. Inferior gluteal line

1. Posterior gluteal line: from outer lip of iliac crest

about 5 cm in front of PSIS to end below just in

front of PIIS.

2. Anterior gluteal line: starts at the middle part of

upper border of greater sciatic notch and runs

upwards and forwards to become continuous with

outer lip of iliac crest just in front of the tubercle.

3. Inferior gluteal line: starts above and behind the

ASIS runs down and behind to end near the upper

part of greater sciatic notch.
Attachments:

1. Gluteus Maximus: rough area behind the posterior

gluteal line.

2. Gluteal Medius: from area between posterior and

anterior gluteal lines.

3.Gluteus Minimus: from the area anterior and inferior

gluteal lines.

4. Rectus Femoris (reflected head): below inferior gluteal

line and above acetabulum.

SURFACES:

B) ILIAC FOSSA:
? Lies between anterior border in front, medial

border behind and iliac crest above.

? Is smooth and concave.
? Has a nutrient foramen at its posteroinferior

part.

? Attachment:
1. Iliacus muscle arises from upper 2/3rd of

this surface.

SURFACES:
C) SACROPELVIC SURFACE:
? Lies between medial border above and in front and posterior border below

and behind.

? Divided into 3 parts:
1. Iliac tuberosity: Rough area on dorsal segment of iliac crest.
Attachments: liolumbar ligament
Dorsal sacroiliac ligament
Interosseous sacroiliac ligament
2. Articular surface:
o Lies below and in front of the iliac tuberosity and resembles the shape of

pinna.

o Articulates with the articular surface of the sacrum.
o Ventral sacroiliac ligament is attached to its anterior and inferior borders

3. Pelvic surface:

lies below and inferior of the articular surface

and helps to form the wall of true pelvis.

Obturator internus muscle arises from this

surface.

THANK YOU.

This post was last modified on 30 November 2021