Bones and Muscles · 41. Muscles of abdomen

Covers the anterior, lateral and posterior muscles of the abdominal wall. For each muscle it gives origin, insertion, innervation, action and blood supply, with the external and internal oblique and transversus abdominis set out side by side. It also includes rectus abdominis with pyramidalis, the cremaster, quadratus lumborum, and a few functional notes such as the hands-to-pocket and hands-to-chest positions.

Inside: 4 sections · 5 labelled pictures · 8 flashcards · 2 min

Topic 40 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 4 sections, about 252 words (2 min of reading), with 8 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 aits. ( From the ant. thoracic alt. )

② Pyramidalis

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

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 facia + 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. facia + 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).