Last update: Aug 28th, 2017

External Oblique Muscle

External Oblique Muscle

External oblique muscle with labels: Deltoid, latissimus dorsi, external oblique, biceps brachii, abdominal aponeurosis, pectoralis major, serratus anterior

External oblique muscle with labels: Pectoralis minor, latissimus dorsi, external oblique, biceps brachii, rectus abdominis, serratus anterior, Linea alba

External oblique muscle with labels: External intercostals, internal intercostals, serratus anterior, external oblique, linea alba, rectus abdominis

External oblique muscle with labels: external oblique, linea alba, internal oblique, abdominal aponeurosis

External oblique muscle with labels: external oblique, linea alba, internal oblique, transversus abdominis, abdominal aponeurosis

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Attachments of External Oblique Muscle: Origin & Insertion

Origin: (proximal attachments)
a. External surfaces of ribs 5-12.

Insertion: (distal attachments)
a. Anterior iliac crest and abdominal aponeurosis to linea alba.

External Oblique highlighted and labeled

External Oblique with labels: Insertion and Origin

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Actions of the abdomen:

a. Flexes vertebral column (draws thorax downward).

First image in animation of a figure with a flexed vertebral column

Second image in animation of a figure with a flexed vertebral column

Third image in animation of a figure with a flexed vertebral column

Fourth image in animation of a figure with a flexed vertebral column

a. Rotates vertebral column (torso).

First image in animation of a figure with a rotated vertebral column

Second image in animation of a figure with a rotated vertebral column

Third image in animation of a figure with a rotated vertebral column

Fourth image in animation of a figure with a rotated vertebral column

a. Laterally flexes vertebral column (compresses abdomen).

First image in animation of a figure with lateral flexion

Second image in animation of a figure with lateral flexion

Third image in animation of a figure with lateral flexion

Fourth image in animation of a figure with lateral flexion

Fifth image in animation of a figure with lateral flexion

Innervation of External Oblique Muscle:

8-12 intercostal, iliohyogastric, and ilioinguinal nerves.

An Overview of the External Oblique Muscle

Test yourself on external oblique muscle with answers hidden

Test yourself on external oblique muscle with answers shown:Deltoid, pectoralis major, latissimis dorsi, serratus anterior, biceps brachii, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown:Pectoralis major, latissimis dorsi, serratus anterior, biceps brachii, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown:Pectoralis minor, latissimis dorsi, serratus anterior, biceps brachii, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown: :External intercostals, internal intercostals, serratus anterior, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown:External intercostals, internal intercostals, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown: Internal intercostals, external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown: external oblique, linea alba, rectus abdominis, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown: external oblique, linea alba, abdominal aponeurosis

Test yourself on external oblique muscle with answers shown: external oblique, linea alba, internal oblique, abdominal aponeurosis

External Oblique with labels: Insertion and Origin

Test yourself while observing the external oblique muscle anatomy

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