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Internal Oblique Muscle

Internal Oblique Muscle

Author: Scott A. Sheffield MS

Last update: Nov 2nd, 2022

The internal oblique abdominis is one of the muscles that make up the abdominal wall.

Internal Oblique Muscle

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

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

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

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

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

Internal Oblique labeled and highlighted

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Attachments of Internal Oblique Muscle: Origin & Insertion

Origin: (proximal attachments)
a. Anterior iliac crest, lateral half of inguinal ligament, and thoracolumbar fascia.

Insertion: (distal attachments)
a. Costal cartilages of ribs 8-12; abdominal aponeurosis to linea alba.

Internal Oblique labeled and highlighted

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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

b. 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

c. Laterally flexes vertebral column (compresses abdomen).

Learn this topic even more efficiently with this trunk wall muscle anatomy reference chart.

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

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Fifth image in animation of a figure with lateral flexion

Innervation of Internal Oblique Muscle:

8-12 intercostal, iliohyogastric, and ilioinguinal nerves.

An Overview of the Internal Oblique Muscle

Muscles That Act On Abdominal Wall

1b Test yourself on internal 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 internal oblique muscle with answers hidden

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

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

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

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

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

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

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

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

Internal Oblique with labels: Insertion and Origin

Test yourself while observing the internal oblique muscle anatomy

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