Topic 24 - Abdominal muscles

Question 1

The muscles

Answer 1

M.obliquus externus abdominus
M.obliquus internus abdominis
M.transversus abdominis
M.rectus abdominis

Question 2

M.obliquus externus abdominus

Answer 2

O: Spf. layer of fascia thoracolumbaris and lat. aspect of ribs 4-12
I: Fibres run caudoventrally to linea alba, caudally on pelvis it forms the inguinal lig. and create a med. and lat. crus around spf. inguinal ring
A: Maintain abdominal pressur and protection of abdominal organs

Question 3

M.obliquus internus abdominis

Answer 3

O: Spf. layer of fascia thoracolumbaris, tuber coxae and from lig.inguinale
I: Fibres run craniovent. (///) to linea alba. At the preumbilical site it has an outer and innter layer witch envelopes m.rectus abdominis.
A: Maintain abdominal pressur and protection

Question 4

M.transversus abdominis

Answer 4

O: By means of deep layer of thoracolumbar fascia from proc.trans. of L.vertebrae, and from med. surface of false ribs. Lumbar nerves crossing on it´s outer surface.
I: Fibres rans transversally (|||) to linea alba
A: Maintaing abdominal pressure and protection

Question 5

M.rectus abdominis

Answer 5

O: Cranially from sternum
(Rectus sheet is formed around this muscle)
I: Pecten ossis pubis (on prepubic tendon, together with m.pectineus)
A: Maintain abdominal pressur and protection

Question 6

Rectus sheet

Answer 6

Formed around M. rectus abdominis
The 4 abdominal muscles (external oblique-E, internal oblique-I, transverse-T, rectus-R) contribute, and the fascia transversa abdominis and perotineum - P.
Outer to inner: Thoracic, preumbilical, umbilical and postumbilical
Thoracic: E - R - Thoracic wall
Preumbilical: E - I - R - I - T - P
Umbilical: E - I - R - T - P
Postumbilical: E - I - T - R - P