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Lecture

Summary Chart for Abdomen and Back Summary chart listing the muscles of the abdomen and back, including origin, insertion, innervation and main action.


Department
Kinesiology
Course Code
KIN100
Professor
Stephen Prentice

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Muscles of the Anterolateral Abdominal Wall (pg116 notes, pg 199 txbk)
Muscle Origin Insertion Innervation Main action
Rectus abdominus Pubic symphysis and
pubic crest
Xiphoid process and 5th-
7th costal cartilages
Lower
intercostal
Flexes trunk (lumbar vertebrae) and
compresses abdominal viscera
(antagonists of the diaphragm to
produce expiration increase
pressure within abdomen);
stabilizes and controls tilt of pelvis
(antilordosis)
Transverse abdominal Internal surfaces of 7th-
12th costal cartilages,
thoracolumbar fascia,
iliac crest, and lateral 3rd
of inguinal ligament
Linea alba with
aponeurosis of internal
oblique, pubic crest, and
pecten pubis via conjoint
tendon
Lower
intercostal
Compresses and supports
abdominal viscera (antagonists of
the diaphragm to produce
expiration increase pressure
within abdomen), flex trunk
Internal oblique Thoracolumbar fascia,
anterior 2/3s of iliac
crest, and lateral half of
inguinal ligament
Inferior borders of 10th-
12th ribs, linea alba, and
pecten pubis via conjoint
tendon
Compress and support abdominal
viscera (antagonists of the
diaphragm to produce expiration
increase pressure within abdomen),
flex and rotate trunk
External oblique External surfaces of 5th-
12th ribs
Linea and alba, pubic
tubercle, and anterior
half of iliac crest
Lower
intercostals
and L1
Increase pressure within abdomen,
flexion and rotation of the trunk
Diaphragm and Levator ani (pg 116 notes)
Muscle Origin Insertion Innervation Main action
Diaphragm Lumbar vertebrae 1,2
(3), xiphoid process,
lower 6 ribs and
cartilages
Its own central tendon Phrenic nerve (C3, C4) Inspiration, expulsion of
abdominal contents, aid
venous return (blood
back to heart) moves
up and down
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