ABDOMINAL Muscles

Question 1

The abdominal muscles

Answer 1

1. M. Obliquus externes abdominis
2. M.Obliquus internus abdominis
3. M.Rectus abdominis
4. M. Transversus abdominis

Question 2

Rectus sheet

Answer 2

From outer –> Inner

o Thoracic: E — R — thoracic wall
o Preumbilical: E — I — R — I — T — P
o Umbilical: E — I — R — T — P
o Postumbilical: E — I — T — R — P

E= M. Obliquus Externus abdominis
I= M. Obliquus Internus abdominis
R= M. Rectus Abdominis
T= M. Transversus Abdominis
P = Peritoneum

Question 3

The abdominal muscles

M. Obliquus externes abdominis

Answer 3

o O: superficial layer of FASCIA THORACOLUMBALIS and
lateral aspect of ribs 4-12.
o I: fibres run caudoventrally (\) to LINEA ALBA,
caudally on pelvis it forms the:
- inguinal ligament, and create
- medial and lateral crus around superficial inguinal ring
o A: Maintaining abdominal pressure
(urination, defecation, parturition),
protection of abdominal organs

Question 4

The abdominal muscles

M.Obliquus internus abdominis

Answer 4

o O: superficial layer of FASCIA THORACOLUMBALIS,
TUBER coxae, and from LIG. INGUINALE
o I: fibres run cranioventrally (///) to LINEA ALBA
At the preumbilical site it has an outer and an inner
layer which envelops m. rectus abdominis.
o A: maintaining abdominal pressure
(urination, defecation, parturition), protection

Question 5

The abdominal muscles

M.Rectus abdominis

Answer 5

o O: cranially from STERNUM
- Rectus sheet is formed around this muscle
o I: PECTEN OSSIS PUBIS
(on prepubic tendon, together with m. pectineus)
o A: maintaining abdominal pressure
(urination, defecation, parturition), protection

Question 6

The abdominal muscles

M. Transversus abdominis

Answer 6

o O: by means of DEEP layer of
FASCIA THORACOLUMBALIS,
from TRANSVERSE PROCESS of lumbar vertebrae,
and from medial surface of FALSE RIBS; lumbar nerves crossing on its outer surface
o I: fibres run transversely (|||) to LINEA ALBA
o A: maintaining abdominal pressure
(urination, defecation, parturition), protection