35. Abdominal wall muscles

Covers the muscles of the anterior, lateral and posterior abdominal wall, going through each muscle's origin, insertion, innervation, action and blood supply. Rectus abdominis and pyramidalis are described first, then the external and internal oblique, transversus abdominis and cremaster, with the oblique muscles' functions shown as hands-to-pocket and hands-to-chest movements. Quadratus lumborum closes the note as the posterior muscle.

Inside: 4 sections · 5 labelled pictures · 22 flashcards · 2 min

Topic 33 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 4 sections, about 236 words (2 min of reading), with 22 flashcards.

Anterior :-

① Rectus Abdominis

O: xiphoid process + 5th - 7th ribs
I: pubic symphysis + pubic crest
N: intercostal n. + subcostal n
F: ventral flexion of the vertebral column.
B.S: Inferior & superior epigastric arts. (from the ant. thoracic art.)

② Pyramidalis

O: pubis (body)
I: linea alba
N: subcostal n.
F: strengthens the rectus sheath.
B.S: inferior epigastric art.

Lateral:

① External oblique:

O: 5th - 12th ribs
I: iliac crest + linea alba
N: intercostal n.
F: Flexion of the trunk.
* F.D: Hands to pocket
B.S: - post. intercostal
- subcostal

② Internal oblique:

O: thoracolumbar fascia + iliac crest + inguinal ligament
I: 10th - 12th ribs + linea alba
N: intercostal n. + subcostal n. + ilioinguinal n. + iliohypogastric n.
F.D: Hands to chest
B.S: - post. intercostal
- subcostal

③ Transverse abdominal

O: 7th - 12th ribs + Tho. fascia + iliac crest
I: linea alba via its aponeurosis
N: intercostal + subcostal ilioinguinal + iliohypogastric
B.S: - post. intercostal
- subcostal

④ Cremaster

Composed of fibers from internal oblique + Transversus-
Covers the spermatic cord.
N: genital branch of genitofemoral n.
F: elevates the testis & scrotum.
B.S: Cremasteric artery (branch of inf. epigastric artery).

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